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Boletín de la Sociedad Argentina de Botánica

versión On-line ISSN 1851-2372

Bol. Soc. Argent. Bot. vol.47 no.3-4 Córdoba jul./dic. 2012



Mimosa diversiplla var. subglabriseta (MimosoIdeae, Leguminosae), a new record for the flora of Paraguay


Javier A. Luna1, Matías Morales2,3 and Renée Fortunato 2,3,4

1 Department of Botany, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom.
2 Facultad de Agronomía y Ciencias Agroalimentarias, Universidad de Morón, Cabildo 134, (B1708JPD), Morón, Argentina.
3 CONICET, Argentina.
4 Instituto de Recursos Biológicos, CIRN, INTA, Los Reseros y Las Cabañas s/n (1686), Hurlingham, Argentina.


Summary: The presence of Mimosa diversipila M. Micheli var. subglabriseta Barneby & Fortunato is now reported for first time in Paraguay. A revision of Barneby's initial description of the variety and photographs of one of the Paraguayan specimens are given in this paper.

Key words: Leguminosae; Mimosa; Mimosa diversipila; Paraguay.

Resumen: Mimosa diversipila var. subglabriseta (Mimosoideae, Leguminosae), una nueva cita para la flora de Paraguay. Reportamos por primera vez la presencia de Mimosa diversipila M. Micheli var. subglabriseta Barneby & Fortunato en Paraguay. Una revisión de la descripción inicial de Barneby y fotografías de uno de los ejemplares de Paraguay se incluyen en este documento.

Palabras clave: Leguminosae; Mimosa; Mimosa diversipila; Paraguay.



Mimosa diversipila M. Micheli was first described from a specimen from Paraguay (Micheli, 1883). Later, Burkart (1948) took this species from the series Lepidotae where Micheli originally described it and reassigned it into the series Meticulosae based on its plumose hairs. Barneby (1991), noting the uncertain circumscription of the series Meticulosae, decided to include the species of this series into the series Mimosa and assigned M. diversipila into the subseries Brevipedes Barneby. Burkart (1948) noted a high degree of morphological variability within M. diversipila and Barneby (1991) formally recognised two varieties, with var. diversipila distributed in Argentina (Corrientes and Misiones provinces), Paraguay (Alto Paraná, Alto Paraguay, Amambay, Caaguazú, Caazapá, Canindeyú, Central, Concepción, Cordillera, Guairá, Misiones, Paraguarí departments) and Brazil (Mato Grosso do Sul state) and M. diversipila var. subglabriseta Barneby & Fortunato restricted to Misiones and Corrientes provinces in Argentina.
Examination of herbarium material revealed further specimens of M. diversipila var. subglabriseta from Paraguay. The specimens revised from Paraguay and adjacent areas of Argentina matched var. subglabriseta in its description. However, their leaflet indumentum differed from the descriptions of the varieties recognised by Barneby (1991). In this paper we clarify the taxonomic placement of these specimens, re-examining type and original material to address errors in the key provided by Barneby that have resulted in the earlier misidentification of Paraguayan material. A revised description and photographs of M. diversipila var. subglabrseta are provided.


Mimosa diversipila var. subglabriseta Barneby & Fortunato. Mem. New York Bot. Gard. 65:705. 1991. Type: Argentina. Misiones, Capital, Arroyo Itaembé, 17-I-1966, Krapovickas & Cristóbal 12094 (holotype: US; isotype: CTES!) (Figs. 1, 2).

Fig. 1. Mimosa diversipila var. subglabriseta collected in Dpto. Itapúa: Isla Yaciretá, 19-II-2004, M. Peña - Chocarro et al. 1777 (BM 000817139).

Fig. 2. Mimosa diversipila var. subglabriseta. A: Leafet abaxial surface 1x. B: Pods 0.8x. C: Flower 3x. D: Ovary 5x.

Unarmed, virgately straightshrub ca. 15 - 20 dm tall, growing in cluster from xylopodium, terminal long pluricapitulate raceme. The dark brown striate stems and the inflorescence axes covered with arborescently plumose setae with dilated golden based and white tips, 0.5 ─ 1.2 mm long; apical areas more densely covered; the olive leafets and stipules densely covered by golden plumose hairs on both surfaces, slightly more dense in the abaxal surface, ciliate on the margins. Stipules persistent, lanceolate 2 ─ 4 × 1 mm, 1 nerved above and 3 nerved beneath. Leaf-stalks very reduced, 1 ─ 2.5× 0.5 mm; pinnae 1-jug, the rachis 45 ─ 70 mm, the interfoliar segments 1 ─ 2 mm; leafets 14─ 30-jug, the ones in the middle of the rachis 4─ 10 × 2 ─ 4 mm, lamina elliptic, base semicordate, apex apiculate, 1 - 2(3) nerved, midrib displaced to one side; paraphyllidia setiform. The terminal inflorescence is a raceme of capitula, simple or few branched; peduncles 9 ─ 12 mm, densely covered with plumose golden hairs; flowers 4-merous, 2 - 2,5 mm long; cup shape calyx semi-pappiform, one sixth of the corolla, ca. 0.1 mm long; the coriaceous petals with few simple hairs on the limb, ca. 0.6 mm long; filaments ± twice the size of the corolla, looking free when rehydrated; adnate staminodia have been seen on a couple of corolla lobes; ovary very hairy, styles longer than filaments covered with few spread black simple short hairs and bearing 2 small glands just under the stigma (only seen twice). Pods 8 ─ several per capitulum, sessil, 6 ─ 15 × 3 ─ 5 mm, (1)3 ─ 4-seeded, the replum less than 1 mm wide with long castaneous- yellowish plumose hairs, some dilated resembling prickles, valves with very dense white plumose hairs, the articles individually dehiscent.

Selected examined material: PARAGUAY. Dpto. Itapúa: Isla Yaciretá, 19.II.2004, M. Peña - Chocarro et al. 1777 (BM, CTES 411457); Pirapó (Punta Fierro), 05.XII.1890, Sellow s.n. (LP 13147); Salitre Cué, 25.I.1944, Pavetti & Rojas 10973 (SI); Yacyretá Dam Island: San Miguel, 24-X-1999, E. M. Zardini & R. Gamarra 52064 (BAB); same locality, 05.XII.2002, E. M. Zardini & R. Gamarra 59279 (BAB). ARGENTINA. Prov. Misiones. Dpto. Capital: Posadas, 01-II-1960, Martínez Crovetto 8876 (BAB).

Obs.: Barneby (1991) separated the two varieties of M. diversipila on the basis of their indumentum. Var. subglabriseta was considered minutely scaberulous toward the base and smooth on the leafets. In var. diversipila the stems are plumose from the base up to or beyond the middle and the setae on leafets are also plumose but often becoming substellate. However, the leafets of the type of M. diversipila var. subglabriseta, and indeed of all specimens of this variety observed posses scaberulous setae; they are not smooth as Barneby (1991) mentioned in his key to varieties. This has resulted in confusion regarding the identity of M. diversipila var. subglabriseta and specifically with respect to Paraguayan material. The two varieties can be reliably distinguished on the basis of their leafet indumentum. Using this character to distinguish the two varieties, it is apparent that M. diversipila var. subglabriseta, whilst considered an endemic of Argentina; also occurs in adjacent areas of South Paraguay (Itapúa Departament, Fig. 3).

Fig. 3. Distribution map of Mimosa diversipila var subglabriseta in Paraguay.


We are grateful to the curators of the cited herbaria that facilitated the access to the studied specimens. We also appreciate the collaboration of María Silvia Ferrucci (Instituto de Botánica del Nordeste, Corrientes, Argentina), María Peña Chocarro and Mark Carine (Natural History Museum, London, UK) for critic reading of the manuscript.


1. BARNEBY, R. C. 1991. Sensitivae Censitae: a description of the genus Mimosa Linneaus (Mimosaceae) in the New World. Mem. New York Bot. Gard. 65: 1-835.         [ Links ]

2. BURKART, A. 1948. Las Especies de Mimosa de la flora argentina. Darwiniana 8: 9-231.         [ Links ]

3. BURKART, A. 1964. Sinopsis de las especies de "Mimosa-Lepidotae". Darwiniana 13: 343-427.         [ Links ]

4. MICHELI, M., 1883. Contributions a la flore du Paraguay. Légumineuses. Mem. Soc. Phys. Geneve 28(7): 57.         [ Links ]

Recibido el 5 de febrero de 2012
Aceptado el 23 de abril de 2012.

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