Banisteriopsis acerosa (Nied.) B.Gates

Authority

Gates, Bronwen. 1982. Banisteriopsis, Diplopterys (Malpighiaceae). Fl. Neotrop. Monogr. 30: 1-238. (Published by NYBG Press)

Family

Malpighiaceae

Scientific Name

Banisteriopsis acerosa (Nied.) B.Gates

Type

Type. Hassler 10481 (leg. Rojas), Paraguay, Cerro Cora, fl fr (holotype, G; isotypes, A, G).

Synonyms

Banisteria acerosa Nied., Banisteriopsis macedoana L.B.Sm.

Description

Species Description - A much branched shrub or slender tree to 2 m tall, not vining. Young branches pendent, terete, slender, smooth, dark brown, glabrous, older branches smooth, terete, dark purplish-brown, glabrous, with pale-brown lenticels. Stipules absent. Leaves pendent with the petiole 4-7 mm long, slender, glabrous, eglandular, the lamina 2-5 cm long, 1.5-7.0 mm wide, smaller in the inflorescence, asymmetric, narrowly lanceolate, obtuse to truncate at base, acute at the apex, with the margin revolute, with a single pair of stipitate glands abaxially on the basal lateral veins, glabrous adaxially, with sparse appressed-golden hairs or glabrate abaxially, with the veins prominulous adaxially, prominent abaxially. Inflorescence of 2-3-flow-ered umbels, terminating numerous branchlets, sparsely pubescent to glabrate; bracts and bracteoles 0.8-1.2 mm long, triangular, sparsely sericeous to glabrate abaxially, glabrous adaxially, caducous before or during flowering. Pedicels sessile, 8-15 mm long, 0.3 mm wide, minutely velutinous. Sepals sericeous abaxially, minutely velutinous near the base adaxially, the anterior sepal 2.4-3.0 mm long, 1.0-1.4 mm wide, narrowly elliptic, keeled, the 4 lateral sepals 2.4-3.6 mm long, 2.0-2.4 mm wide, broadly elliptic, narrowed at the apex, with the glands 1.2-2.0 mm long, 1.0-1.4 mm wide, dark red brown. Petals white, those outermost in bud often with a red median zone, dentate, the 4 lateral petals reflexed between the sepals, the claw 2.0-4.0 mm long, 0.4-0.5 mm wide, the limb 6.0-8.5 mm long, 6.0-8.0 mm wide, orbicular, eglandular, the antero-lateral petals cucullate and the postero-lateral petals flat to slightly concave, the posterior petal with the claw erect, 4.5-5.5 mm long, up to 1.4 mm wide at the apex, not constricted, the limb 4.5-6.0 mm long, 4.0-6.0 mm wide, orbicular, reflexed, with the basal teeth gland-tipped. Stamens with the filaments 1.0-2.4 mm long, connate basally, the locules densely pilose, 0.8-1.5 mm long, the connectives white, those of the stamens opposite the petals 0.5-1.0 mm long, 0.4-0.7 mm wide, 0.1-0.4 mm deep, not glandular, those opposite the sepals 0.8-1.4 mm long, 0.5-1.0 mm wide, 0.4-1.0 mm deep, with the apex enlarged and glandular. Ovary 1.2-1.4 mm tall, white-sericeous, styles equal, diverging, 2.0-2.5 mm long, flattened distally to 0.6 mm wide, stigmas capitate. Fruit with carpophore up to 5 mm long and 0.5 mm wide, nut 6-7 mm tall, 4-5 mm long, golden-brown, rugose to tuberculate, with golden appressed pubescence, the wing 15-21 mm long, 7-10 mm wide, with appressed stiff golden hairs or glabrate, dark red, the upper and lower margins subparallel, the lower margin meeting the nut ca. halfway along its distal edge.

Discussion

Chromosome number, n = 10. Voucher, Anderson 11177.

Distribution

Open grassland in SE Mato Grosso and the Triangulo Mineiro of Minas Gerais in Brazil, extending northward to the Distrito Federal and Rio Pardo in Minas Gerais and southward to the Sierra de Amambay in Paraguay.

Brazil South America| Mato Grosso Brazil South America| Distrito Federal Brazil South America| Minas Gerais Brazil South America|