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Darwiniana, nueva serie

versión impresa ISSN 0011-6793versión On-line ISSN 1850-1699

Darwiniana v.42 n.1-4 San Isidro ene./dic. 2004


The genus Isostigma (Asteraceae, Heliantheae) in Argentina: two new records and notes on distribution

Guadalupe Peter

Laboratorio de Plantas Vasculares, Universidad Nacional del Sur, San Juan 670, B8000ICN Bahía Blanca, Argentina. E-mail:

ABSTRACT: Peter, G. 2004. The genus Isostigma (Asteraceae, Heliantheae) in Argentina: two new records and notes on distribution. Darwiniana 42(1-4): 207-215.
   Isostigma dissitifolium and I. speciosum are newly reported for Argentina (Misiones Province). Five species have been previously recorded: I. cordobense, I. crithmifolium, I. hoffmannii, I. molfinianum and I. peucedanifolium. All distributions are updated. I. dissitifolium and I. speciosum are described, illustrated and their geographical distribution is given. A key to differentiate Argentine species of Isostigma is provided.

Key words: Isostigma; Flora; Taxonomy; Heliantheae; Asteraceae; Argentina.

RESUMEN: Peter, G. 2004. El género Isostigma (Asteraceae, Heliantheae) en la Argentina: dos nuevos registros y notas sobre distribución. Darwiniana 42(1-4): 207-215.
   Isostigma dissitifolium e I. speciosum son registradas por primera vez para la Argentina (Provincia de Misiones), sumándose a las cinco especies del género ya citadas para el país: I. cordobense, I. crithmifolium, I. hoffmannii, I. molfinianum e I. peucedanifolium. Se actualizan las distribuciones de todos estos taxones. I. dissitifolium e I. speciosum son descriptas e ilustradas y se provee una clave para diferenciar las especies argentinas de Isostigma.

Palabras clave: Isostigma; Flora; Taxonomía; Heliantheae; Asteraceae; Argentina.

Original recibido el 29 de septiembre de 2003;
el 17 de mayo de 2004.


   Isostigma (Asteraceae, Heliantheae, Coreopsidinae) is a South American genus described by Lessing in 1831. It is a poorly studied group of 13 species (Sherff, 1926, 1931; Cabrera, 1959) of perennial herbs and subshrubs from northeastern and central Argentina, southern Brazil, southeastern and central Bolivia, Paraguay and northwestern Uruguay. Species of Isostigma range from arid and semi-arid to moist habitats. Plants belonging to this genus exhibit Kranz syndrome. A new type of Kranz anatomy for the Asteraceae was described for some species of Isostigma (Peter & Katinas, 2003).
   In previous works (Sherff, 1926, 1931; Ariza Espinar, 1969, 1975, 2000; Cabrera, 1974; Sáenz, 1999) five species of Isostigma have been noted to occur in Argentina: I. cordobense, I. crithmifolium, I. hoffmannii, I. molfinianum and I. peucedanifolioum. Isostigma dissitifolium has been cited for Paraguay, and I. speciosum have been cited for Brazil and Paraguay, although neither of them has been previously known for the Argentinean flora. During a revision of the genus Isostigma, material of I. dissitifolium Baker and I. speciosum Less. was found from the Province of Misiones, in Argentina. Therefore, with these records, there are seven species of the genus in Argentina.


Key to the Argentinean species of Isostigma

1. Capitula in pseudocorymbs. Leaves linear to narrowly ovate, entire or 3-furcate ....................... I. molfinianum
1. Capitula solitary ................................................................................................................................................ 2
2(1). Leaves distributed along the stem ...................................................................................................................... 3
2. Leaves rossulate ................................................................................................................................................. 5
3(2). Perennial herbs or subshrubs 0.60-1 m tall, with xylopodium. Cypselas glabrous ......................... I. dissitifolium
3. Perennial herbs or subshrubs up to 0.60 m tall, lacking xylopodium. Cypselas hispid ..................................... 4
4(3). Leaves deeply pinnatisect, with 1-2 pairs of linear leaflets, less than 1 mm wide ......................... I. cordobense
4. Leaves pinnatisect or rarely bipinnatisect, with 1-3 pairs of ovate leaflets of 0.5-4 mm width, sometimes furcate or dentate at the apex ......................................... I. hoffmannii
5(2). Stem expanded at the base of the capitulum (4-7 mm wide), more than 20-bracteolate on the upper part ........................................................................ I. speciosum
5. Stem isodiametric throughout (up to 3 mm at the base of the capitulum), less than 10-bracteolate on the upper part ......................................................................................................................................................... 6
6(5). Leaves pinnatisect to multipinnatisect, leaflets subulate or filiform of 0.2-0.7 mm wide. Petiole and leaflets canaliculate .................................................................. I. peucedanifolium
6. Leaves pinnate or bipinnatisect, leaflets linear of 0.5-1.3 mm width. Petiole and leaflets flat .... I. crithmifolium

1. Isostigma dissitifolium Baker, in Martius, Fl. Bras. 6 (3): 239. 1884. Isostigma peucedanifolium Less. var. dissitifolium (Baker) Hassl., Repert. Spec. Nov. Regni Veg. 14: 277. 1916. TYPE: Paraguay, Dept. Paraguarí, "Guarapi (commune de Yaguaron), sur les collines incultes, Juin 1877", Balansa 907 (lectotype, K, designated by Sherff, 1926: 251; photograph of lectotype: BBB!; isolectotypes, F!, G!, P, photograph of isolectotypes, P 265804!, P 265805!, P 265806!). Fig. 1.

Fig. 1.- Isostigma dissitifolium. A: plant. B: capitulum in flower. C: capitulum with fruits. D: marginal flower. E: disc flower. F: palea. G: cypsela. A-B: from Hassler 6309 (NY). C-G: from Fiebrig 450 (GH). Scale bars: A-C = 1 cm; DG = 1 mm.

   Perennial herbs or subshrubs, erect, 0.60-1 m tall, with xylopodium. Stems: multiple, moderately branched, leafy, striate, glabrous, 1.5-3 mm wide (up to 5 mm at the base). Basal leaves: crowded, deeply bipinnatisect; stem leaves: alternate o rarely opposite, deeply pinnatisect or simple; glabrous, 2-16 cm long, shorter towards the apex, margin hyaline very narrow; leaflets: linear or subulate, 0.3-10 cm long x 0.5-1 mm wide, acute or acuminate; the simple ones subulate, up to 4.5 cm long, with margin hyaline; petiole: short, expanded at the base, up to 4 cm long x 1-1.5 mm wide. Capitula: broadly campanulate or subglobose, solitary, radiate, 1.4-2 cm high x 1.7-5 cm wide at flowering and 1.3-2 cm high x 1.5-3 cm wide at fructification; peduncle: somewhat expanded at the base of the capitulum. Involucre: 2-3- seriate, 1-1.1 cm high x 1.5-2 cm wide, with 1-2 bracteoles at the base; outer phyllaries: 8-10, subulate or linear, acute or acuminate, margin hyaline, 3-12 mm long x 0.5 mm wide; inner phyllaries: 1-2 rows, ovate, brown, scarious, obtuse, margin widely hyaline, irregular, 1-1.2 cm long x 2-3.5 mm wide. Receptacle: flat, alveolate. Paleae: linear, keeled, membranous, with veins and apex purple, acute, apically crenate, 6-13 mm long x 1 mm wide. Marginal florets: ligulate, 10-14, female; ligule: linear, pubescent, purple with the inner part white with dark veins, 10-nerved, 1.5-1.6 cm long x 2-2.5 mm wide; tube: 3.5-5 mm long, deeply 2-3-toothed, teeth acute, 3-5 mm long. Disc florets: perfect, purple, corolla tubular; limb: abruptly broadened, 5- lobed, pubescent, 4-5 mm long, lobes acute 1.5-2 mm long, pubescent; tube: 2.5 mm long. Anthers: obtuse at the base, 2.5-3 mm long; appendages cordate. Style branches with appendages of 4-5 mm in length, appendages covered by hairs on the external face; hairs simple, 1-2-seriate, 5-7 cells long. Cypselas linear, flattened, striate with the middle rib outstanding, black with the apex, base and wing yellow, glabrous, winged, 0.9-1.8 cm long x 1.5-2.5 mm wide, the marginal ones shorter. Pappus biaristate or null; aristae triangular, acute, erect to divergent, smooth, up to 1.5 mm long.

   Phenology. Flowering from September to June.

   Geographical distribution and ecology. Southern Paraguay (Departments of Cordillera and Paraguarí) and northeastern Argentina (Province of Misiones) (Fig. 2). With this record, the eastern boundary of I. dissitifolium distribution is extended, from 56º40'W to 55º30'W and the southern boundary from 25ºS to 27ºS. Isostigma dissitifolium grows upon hills, in rocky high places, grasslands and sandy fields.

Fig. 2.- Map showing the distribution of Isostigma dissitifolium and I. speciosum.

Material examined

   ARGENTINA. Misiones. Dept. Candelaria-San Ignacio: Campo entre Santa Ana y San Ignacio, I-1922, Molfino s.n. (F 672852).
   PARAGUAY. Cordillera. Cordillera Central, Cerros de Tobatí, IX-1902, Hassler 6309 (BM, F, G, GH, NY; fotocopia: W); Cordillera de Altos, II-1898/1899, Hassler 3944 (G); Cordillera de Altos, XI-1902, Fiebrig 450 (BM, F, G, GH, US; fotocopias: RSA, W); Cordillera de Altos, Caacupé-Tobatí, XII-1936, Archer & Rojas 4894 (LP); along road between Caacupé and Tobaty, 2-I- 1937, Archer & Rojas 4894 (NY); Inter rupibus dunatae pr. Valenzuela, X-1942, Pavetti 9998 (AS); Itacurubí, X- 1885/1895, Hassler 1074 (G); Mbocayá guazú-ty, 18- XII-1950, Schwarz 11118 (LIL); San Bernardino, X- 1915, Hassler 1509 (G). Without locality, Hassler s.n. (G 8088/546); without locality and collector (G 8088/ 545).

   Observations. Isostigma fiebrigii Hieron. ex Sherff, Bot. Gaz. 81 (3): 251, 1926, nom. nud.
   According to Fiebrig (in sched.), the crumpled leaves smell like celery.
   The specimens Archer & Rojas 4894 of LP and NY have different dates and details of collection. Because of that, they have been mentioned separately.

2. Isostigma speciosum Less., Linnaea 6: 515. 1831. TYPE: "Brazil, Sello" (lectotype, B, designated by Sherff, 1926: 256, probably destroyed; neotype, here designated, "Brasil, Paraná. Loc. Vila Velha. Obs. En campo cerca de la iglesia. Flores moradas. 16-I-1987, A. Krapovickas & C. L. Cristóbal 40922", CTES!; isoneotypes, F!, GH!). Fig. 3.

Fig. 3.- Isostigma speciosum. A: plant. B: xylopodium. C: entire leaf. D: pinnatisect leaf. E: capitulum in flower. F: capitulum with fruits. G: marginal flower without style. H: disc flower. I: palea. J: cypsela. A, C: from Dusén 16444 (GH). B, D: from Fiebrig 810 (RSA). E: from Cruz et al. 80 (BHCB). F: from Jörgensen 4806 (F). G: from Dombrowski1474 (LP). H-J: from Montes 14903 (NY). Scale bars: A-F = 1 cm; G-J = 1 mm.

   Isostigma peucedanifolium (Spreng.) Less. f. discoidea Hassl., Repert. Spec. Nov. Regni Veg. 14: 277. 1916. TYPE: Paraguay, Dept. Cordillera, "Cerros de Tobatí. 31-1-1903", Fiebrig 810 (holotype, G 8088/575-569!; isotypes: AS!, BM!, F!, GH!, RSA, photocopy of isotype, BBB!).
   Isostigma peucedanifolium (Spreng.) Less. f. radiata Hassl., Repert. Spec. Nov. Regni Veg. 14: 277. 1916. TYPE: Brazil, St. Mato Grosso do Sul, "1898/99. Nº 5586 UNICUM. In campo Ipé-hú. Sierra Maracayu. Lect. Dec.", Hassler 5586 (lectotype here designated, G 8088/570!; syntype: "Dr. E. Hassler. Plantae Paraguayenses. 1907-08. Itinera in Paraguaria septentrionali. N° 10366. UNICUM. Sierra de Amambay in campo siacese Punta Pará. Custos herbarii nostri T. Rojas leg. Mens. April", G!).

   Perennial herbs or subshrubs, 0.6-1.2 m tall, with xylopodium. Stems simple, 1-2 per plant, erect, leafy at the base and bracteolate in the upper part (with more than 20 bracteoles), 2-3 mm wide, generally expanded at the base of the capitulum (4-7 mm wide). Bracteoles linear or subulate, acute, subobtuse or acuminate, margin scarious, glabrous or ciliate at the margin and/or back, the inferior ones up to 20 cm, gradually shorter and denser toward the apex. Leaves: rosulate, 8-45 cm long, entire or ternatisect, glabrous, long-petiolate, petiole canaliculate, from 1/2 to 2/3 of the total length, expanded at the base with a membranous margin; leaves deeply ternatisect or biternatisect: up to 8 leaflets, leaflets: ascendent, linear to subulate, 2-15 cm long x 0.5-2.5 mm wide, acute or acuminate; leaves entire: linear, canaliculate, acute, up to 1 mm wide. Capitula campanulate to subglobose, solitary, terminal, radiate or discoid, 1.3-2.3 cm high x 2.5-6 cm wide at flowering and 1.6-2 cm high x 3-4.2 cm wide at fructification. Involucre: 3-4-seriate, 1.4-2.5 cm high x 2.5-3.5 cm wide, glabrous; outer phyllaries linear or triangular, acute, margin scarious, sometimes ciliate, 0.5-1.3 cm long x 1-3 mm wide, similar to the stem bracteoles; inner phyllaries triangular to ovate, brown, scarious, margin hyaline sometimes ciliate, acute, obtuse or rounded, apically crenate, 1.1-2.5 cm long x 1-4 mm wide. Receptacle convex, alveolate. Paleae linear to triangular, keeled at the base, membranous, veins and apex brown, acute, entire or apically crenate, somewhat ciliate, 1.5-1.7 cm long x 1-1.5 mm wide. Marginal florets ligulate, 15-20, female; ligule: linear, purple with the inner face yellow or white with dark veins, 14-nerved, 1.6-1.9 mm long x 2.5-4 mm wide, pubescent, 2-3-toothed; tube 2.5-3 mm. Disc florets: perfect, corolla tubular with abruptly broadened limb, 5-lobed, 4-7 mm long; lobes: acute, 3-4 mm long, pubescent on the outer face; tube 2-4 mm long. Anthers: obtuse at the base, 3-4 mm long; appendages cordate. Style branches with appendages of 5 mm long, appendages covered by hairs on the external face; hairs simple, 2-seriate, acute or rounded, 3-6 cells long. Cypselas linearoblong, flattened, truncate at the apex, striate with 1-3 ribs outstanding, brown with hyaline wings, glabrous, 1.1-1.8 cm long x 2-3 mm wide. Pappus biaristate; aristae triangular to acicular, divergent to ascendent, smooth, rudimentary up to 2 mm long, one longer than the other.

   Phenology. Flowering from November to March and fruiting from January to March.
   Common names. "Cravo do campo", "Clavel de campo", "Clavelón".

   Geographical distribution and ecology. Presently known from northeastern Argentina (Province of Misiones), southern Brazil (States of Mato Grosso do Sul, Paraná and São Paulo) and eastern Paraguay (Departments of Alto Paraná, Amambay, Caaguazú and Cordillera) (Fig. 2). With this record, the southern boundary of I. speciosum distribution is extended from 25º30'S to 27º20'S. I sostigma speciosum grows in "cerrado", hills, high fields, plateaus, slopes, valley boundaries, savannas, grasslands, "campos" and bordering forests; from 200-700 m elevation.; in dry and burned places. It can be scarce to locally abundant, and rebuds after fires.

Material examined

   ARGENTINA. Misiones: Dept. San Ignacio: San Ignacio (Colonia), 12-III-1956, Montes 14903 (NY).
   BRAZIL. Paraná. Capão Grande, 7-III-1904, Dusén 4345 (BM, SI), 3-II-1909, Dusén 7676 (BM); Desvio Ribas, 17-XII-1911, Dusén 11359 (GH); Estado do Café, km 70 PR, 7-II-1965, Dombrowski 1474 (LP); Jaguariaiva, 17-I-1915, Dusén 16444 (F, GH, SI); Mun. Ponta Grossa, Vila Velha, 10-II-1960, Pereira 5240 (F), 14-I-1964, Pereira 8300 & Pabst 7575 (LP), 5-III-1970, Koyama et al. 13847 (SP); Mun. Ponta Grossa, Rod. BR- 277, km 522, próximo a Vila Velha, 3-II-1999, Cruz et al. 80 (BHCB); Río Tibagi, 30-I-1959, Hatschbach 5442, hoja b (LIL). São Paulo. Itapetininga, 5-XI-1887, Löfgren 16773 (NY, US).
   PARAGUAY. Alto Paraná. Estancia Santa Elena, Reserva Abierta, NE de Hernandarias, zona Río Pytá, 2-I- 1991, Caballero Mármori 2009 (CTES). Amambay. Sierra de Amambay, 1907/1908, Hassler 5586 (G 8088/ 571); Sierra de Amambay, Co. Torín, II-1922, Rojas 4239 (LP). Caaguazú. Sierra de Maracayú, Yerbales, Hassler 5586 (G 8088/572). Dept. unknown: Estancia Primavera, I-1932, Jörgensen 4806 (F, MO, TEX). Without locality, date and colector (AS 4239/349).

   Observations: I. speciosum has a scent similar to honey or carnation.
   This species is closely related to I. peucedanifolium, but I. speciosum has broader and more bracteolate stems than I. peucedanifolium, and the leaves of the latter are more divided. In some specimens, there is some overlap of these characters.
   Some specimens (e.g., Dusén 16444, Jörgensen 4806, Hatschbach 5442) do not present the diagnostic character of a peduncle expanded at the base. This character shows some variation even within the same specimen.
    Lessing (1831) did not cite a collection number or any locality data for the type material collected by Sello. Sherff (1926) cited the Sello material deposited in B as the only type; therefore, I consider that material as the lectotype. But it could not be located at B, because it has been destroyed (Wallnöfer, pers. com.). There is not another specimen collected by Sello or duplicates of this material at the consulted herbaria. Therefore, it is necessary to designate a neotype.
   In the description of Isostigma peucedanifolium f. radiata, Hassler (1916) mentioned two specimens from Paraguay: Hassler 5586 and Hassler 10366. These specimens are syntypes. In G there are three sheets of Hassler 5586 numbered as 570, 571 and 572, with different dates and places of collection. In his work Hassler referred to a previous work of Chodat (1901) when the locality is specified. With these data, I concluded that the specimen numbered as G8088/570 is the type material cited by Hassler. Besides, this specimen has a label with the inscription: "type". Therefore, I consider Hassler 5586 as the lectotype and maintain Hassler 10366 as a syntype. The collection data of the rest of the specimens numbered as Hassler 5586 and not included in the type material are detailed in the material examined.

3. Isostigma hoffmannii Kuntze

   Sherff (1926) mentioned that this species inhabits the Province of Santiago del Estero, based on a Lorentz specimen deposited in B; however, it was not possible to locate this specimen. Ariza Espinar (1969), Cabrera (1974) and Sáenz (1999) maintain this distribution based on Sherff's work but they did not cite any additional reference material. The same situation occurs for the Province of San Juan, mentioned by Sáenz (1999), but without reference material.
   In the present work, the distribution of I. hoffmannii for Argentina can be confirmed only in the Province of Corrientes (Fig. 4).

Fig. 4.- Map showing the distribution in Arentina of Isostigma hoffmannii, I. molfinianum, I. peucedanifolium, I.crithmifolium and I. cordobense.

Material examined

    ARGENTINA. Corrientes. Dpto. Bella Vista: 3 km W del Paso Torre de Río Santa Lucía, 18-VI-1970, Carnevali 2194 (CTES, CTES 28652). Dpto. Empedrado: Ea. "El Plata", 6-XII-1977, Pedersen 12015 (CTES, SI). Dpto. Lavalle: Ruta 12 km 753, 27-II-1961, Pedersen 5821 (CORD, LL, LP, NY; fotografía: B). Dpto. Mercedes: Mercedes, 7-II-1925, Parodi 6288 (GH). Dpto. Paso de los Libres: Ruta de Mercedes a Paso de los Libres, cerca de Miriñay, 5-XI-1976, Pedersen 11365 (CTES, SI).

4. Isostigma molfinianum Sherff This species is endemic to Argentina. Until now, it has been cited only for the Province of La Rioja (Sherff, 1931; Ariza Espinar, 1969, 2000; Sáenz, 1999), but during the revision of the genus, material from the Province of Catamarca was found. Therefore, the distribution of I. molfinianum is extended northwards (Fig. 4).

Material examined

    ARGENTINA. Catamarca. Without locality, I- 1910, Lillo s/n (F); without locality, I/II-1910, Spegazzini 33185 (BAB); without locality, 1-II-1910, Spegazzini 33306 (F). La Rioja. Dpto. Capital: 20 km al norte de Carrizal, entre Mazán y La Rioja, 4-VII-1933, Hayward 8612 (BA). Dpto. Chilecito: Cuesta de Catinzaco, 30-I- 1906, Kurtz 13369 (CORD); Quebrada Totoral, cerca de Catinzaco, Bodenbender s.n., II-1896 (CORD, GH, LP).

5. Isostigma peucedanifolium (Spreng.) Less. Cabrera (1974) mentioned that this species had been cited for the Province of Entre Ríos by several authors. Sáenz (1999) cited I. peucedanifolium for the Provinces of Corrientes, Misiones and Entre Ríos. But, they did not cite specimens seen or bibliographic references. In the course of this work, distribution of I. peucedanifolium in Argentina is confirmed in the Provinces of Corrientes and Misiones (Fig. 4).

Material examined

    ARGENTINA. Corrientes. Dpto. Bella Vista: Bella Vista, en la barranca del río Paraná, 1-XII-1945, Boelcke 1565 (SI). Dpto. Berón de Astrada: Itá Ibaté, 15 km al W, Ayo. Santa Isabel, 16-I-1977, Schinini 14082 (CTES, F). Dpto. Capital: lomada arenosa del Ayo. Riachuelo, 13-II- 2004, Peter 243 (BBB). Dpto. Concepción: Cerro Puitá, 14 km al E de la ruta, 28º35'S, 58º04'W, Ea. Tranquera de Hierro, 66 km al NE de Chavarría, camino a Concepción, 3-XII-1996, Arbo, Cáceres & Maruñak 6966 (CTES). Dpto. Empedrado: Empedrado, Ea. Tres Marías, cercano al río Paraná, 59ºW, 27º50'S, 20-III-1998, Schinini 34383 (CTES, NY). Dpto. General Paz: 15 km al E de Itá Ibaté, ruta 12, Ayo. Santa Lucía, 9-IV-1972, Mroginski, Schinini & Pueyo 753 (CTES). Dpto. Goya: camino a Las Mercedes, 14-XII-1948, Cabrera 10535 (LP). Dpto. Ituzaingó: Villa Olivari, Establecimiento Forestal, Reserva, 10-II-2004, Peter 240 (BBB). Dpto. Lavalle: Cerrito ruta 152 y Arroyo Batel, 21-XI-1979, Schinini, Vanni & Norrman 18867 (CTES, OS). Dpto. Mburucuyá: Ea. Santa Teresa, 15-XII-1951, Petersen 1392 (MO). Dpto. San Cosme: Paso de la Patria, near cementery, 26-XI-1978, Renvoize 3610 (CTES, MO, NY; fotografía: B). Dpto. Saladas: Pago Alegre, 6-XII-1949, Schwarz 9016 (LIL). Dpto. San Miguel: Ea. Juan Poriajhu, ruta 17, 18 km ruta 12, potrero Tres Marías, 6-XII-1992, Tressens, Beccaceci & Vanni 4270 (CTES, FCQ). Dpto. San Roque: Ruta 17, 32 km SW del desvío a Santa Rosa, 1-XII-1983, Tressens, Cáceres, Ferrucci, Schinini & Vanni 2166 (CTES). Misiones. Dpto. Cainguás: Campo Grande, 13- III-1948, Noratti 166 (BAB). Dpto. Candelaria: Loreto, 25-I-1933, Grüner 1296 (LP, TEX). Dpto. San Ignacio: San Ignacio, campo vecino a la casa de Horacio Quiroga, 4- II-1995, Krapovickas & Cristóbal 46452 (CTES).

6. Isostigma cordobense Cabrera

   This species is endemic to Argentina. Until now it has been cited only for the Province of Córdoba (Sherff, 1935; Cabrera, 1959; Ariza Espinar, 1969, 2000; Sáenz, 1999) (Fig 4).

Material examined

   ARGENTINA. Córdoba. Dpto. Capital: Córdoba (campo de la Escuela de Agricultura), V-1905, without colector 14449 (F 672850). Dpto. Colón: Saldán, lomas frente al balneario San Remo, 22-XI-1964, Ariza Espinar 1969 (CORD, LP). Dpto. Ischilín: Sierras al este de Dean Funes, IV-1951, Sayago 701 (CORD, LP). Dpto. Punilla: Valle de Punilla, Capilla del Monte, cerca del Co. Uritorco, 23-XI-1917, Hosseus 1054 (CORD). Dpto. Tulumba: Co. Sauce Punco, 18-XII-1947, Meyer 13065 (CORD).

7. Isostigma crithmifolium Less. Cabrera (1974) and Sáenz (1999) mentioned that this species had been cited for the northeastern Argentina, reaching the Province of Entre Ríos. In this work, this distribution is confirmed (Fig. 4).

Material examined

   ARGENTINA. Corrientes. Dpto. Gral. Alvear: Torrent F.C.N.E.A., 2/10-XII-1936, Spegazzini 272 (CTES). Dpto. Ituzaingó: 25 km E de Ituzaingó, ruta 12, 15-I-1966, Krapovickas & Cristóbal 11995 (CTES). Dpto. Mercedes: M. I. Loza (Est. Solari), Estancia "El Cerro" del Sr. Brochon, 15-XII-1960, Royo 169 (CTES, MO). Dpto. Monte Caseros: Ruta 127, próximo a Monte Caseros, 2-XII-1950, Nicora 5669 (CTES, LP). Dpto. Paso de los Libres: Est. "Santa Ana", rincón de S. Ana, 21 km al E de Bonpland, costa Río Uruguay, 19-XI-1973, Lourteig, Schinini & Maruñak 2809 (CTES). Dpto. Santo Tomé: ruta 40, 14 km S de Santo Tomé, 20-XI-1973, Lourteig, Schinini & Maruñak 2912 (CTES, LP). Entre Ríos. Dpto. Colón: Parque Nacional El Palmar, 22-XI- 1981, Cusato 876 (CTES). Dpto. Concordia: Concordia, 24/30-XI-1936, Spegazzini 99 (BAB). Dpto. Federación: Salto Grande, 18-IV-1960, Burkart & Gamerro 21965 (SI). Misiones. Dpto. Capital: Itaimbé, 30-I-1935, Rodriguez 520 (BA).


    I thank Dr. Carlos Villamil and Dr. Daniel Giuliano for critical reading of the manuscript. Also acknow-ledged are curators for providing loans herbarium specimens and the artist Marcela Scarlatto for inking figures 1 and 3. This work was supported by Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Universidad Nacional del Sur (UNS).


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