Rhynchosia caaguazuensis Hassl.

  • Authority

    Grear, John W. 1978. A revision of the New World species of Rhynchosia (Leguminosae-Faboideae). Mem. New York Bot. Gard. 31 (1): 1-168.

  • Family

    Fabaceae

  • Scientific Name

    Rhynchosia caaguazuensis Hassl.

  • Description

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    Species Description - Erect herb or subshrub, to 1 m, from woody rootstock, the stems few to several, simple or few-branched, angled (becoming terete on older stems), tomentulose, the hairs cinereous. Stipules ovate, acute, caducous, 1-1.5 mm long, 1-1.5 mm wide. Petioles short, 3-10 mm. Leaflets 3, coriaceous, margins revolute, oblong to oblong-lanceolate, apex obtuse, often slightly emarginate or mucronate, base obtuse or cuneate, 1.5-5 cm long, 3-16(-20) mm wide, appressed tomentulose above, entangled tomentulose beneath, gland-dotted on both surfaces, terminal petiolule 3-7 mm, the laterals subobsolete to 2 mm, stipels lacking. Inflorescences non-branched, usually not exceeding the leaves, 1-10 cm, the flowers usually in crowded heads, peduncle subobsolete to 12 mm, pedicels 2-5 mm. Bracts ovate, acute, caducous, 1 mm long, 1 mm wide. Calyx not exceeding the corolla, tomentulose and gland-dotted, 8-9 mm, tube 2-2.5 mm, lobes linear-lanceolate, 6-7 mm, vexillar sinus 1.5-2 mm. Corolla yellow, flushed purple or reddish, 8-11 mm. Standard ovate, emarginate, puberulous and gland-dotted, 10-12 mm long, 7-8 mm wide, auricles 1 mm, claw 2 mm. Wings oblong, puberulous and gland-dotted, 10-12 mm long, 2.5-3 mm wide, claw 2-2.5 mm. Keel blades falcate, glabrous, 9-11 mm long, 3-4 mm wide, claw 2-2.5 mm. Stamens 9-11 mm. Fruits ovate-elliptic, gland-dotted and puberulous, compressed, 2-2.5 cm long, 8-9 mm wide, beak 1-2 mm. Seeds suborbicular, compressed, brown, black or mottled, 4-5 mm long, 3-4 mm wide, hilum ovate, 1-1.5 mm, strophiole lobes cuneate.

  • Discussion

    Type. PARAGUAY, “in campis pr. Caaguazú,” E. Hassler 9013, Feb. 1905 (holotype, G; phototypes, MO!, US!; isotypes, BM!, F!, G!, GH!, K!, NY!, P!, S!,UC!). Rhynchosia caaguazuensis is represented by only a few collections from eastern Paraguay, almost entirely from the department of Caaguazú. The erect habit and narrowly oblong to widely-linear leaflets are reminiscent of R. cytisoides and R. lineata, but the species is distinct in many other ways. It would appear to have no close relatives within section Arcyphyllum.

  • Distribution

    Distribution. Eastern Paraguay (Fig. 19). Occurring primarily in campos or in calcareous areas near streams; at low elevations.

    Paraguay South America|