Barbacenia leucopoda L. B. Sm.

Barbacenia leucopoda L. B. Smith

Barbacenia leucopoda L. B. Smith, Contr. U.S. Nat. Herb., 35:282, pl. 10: figs. 29, 30, 1962.

Aylthonia leucopoda (L. B. Smith) Menezes, Ciência e Cultura, 23(3):[421], 1971.

TYPE.—In campo, Serra do Cipó, Mun. [Conceição do] Mato Dentro, Minas Gerais, Brazil, 15 January 1951, Macedo 2999 (UC, holotype).

DISTRIBUTION.—Known only from the type-collection.

99. Barbacenia sordida L. B. Smith & Ayensu, new species

A B. blackii L. B. Smith, cui parum affinis, scapis floribusque valde viscosis, perianthii tubo tepalisque angustioribus differt.

Caudex short, few-branched (!Irwin et al.), covered by old leaves. Leaves sulcate on both sides, viscous; sheaths covered; blades linear-lanceolate, filiform-attenuate, constricted toward base, 32 cm long, 20 mm wide, densely vestite with fine white hairs ca. 0.5 mm long and scattered hairs 4–5 mm long, the furrows as wide or wider than the nerves when dry.

Scapes 3, about equaling the leaves, vestite like the leaves but the hairs mostly gland-tipped and a larger proportion of the long ones. Flowers viscous, vestite like the scapes, pinkish cream (!Irwin et al.). Ovary ellipsoid, distinct, 20 mm long, much enlarged in fruit. Perianth-tube above ovary cylindric, 25 mm long, 3 mm wide. Tepals nearly uniform, narrowly lanceolate, 20 mm long. Anthers ca. 12 mm long; coronoid appendages suboblong, 9 mm long, bidentate. Style exceeded by the stamens, slightly conical-thickened at apex with 3 linear confluent stigmas.

LEAF ANATOMY (Irwin et al. 23673).—Surface View: Hairs: multicellular and tufts of hairs present on both surfaces. Epidermis: cells on both surfaces square to rectangular; thin-walled. Stomata: tetracytic; 21 × 15 μm; present on both surfaces.

Transverse Section of Lamina: Dorsiventral; very widely V-shaped. Adaxial surface undulating; abaxial surface with small furrows. Multicellular hairs and tufts of hairs present on both surfaces. Epidermis: cells on both surfaces rounded to dome-shaped; few oval; thin-walled. Cuticle: thin and smooth over entire surface. Stomata: present on both surfaces; stomata flush with epidermal surface; substomatal chamber present. Mesophyll: 3 or 4 layers of compactly arranged, rounded cells followed by 1 or 2 layers of large, translucent cells. Below this occur 3 or 4 layers of compactly arranged, rounded cells. Cells larger and translucent above midvein. Vascular bundles: 29; commissural bundles observed. One or two large vessels present in each bundle, mostly one. Two phloem units lying laterally in flanges of short Y-shaped abaxial girder. Inverted Y-shaped adaxial girder present on each bundle. Bundle sheath completely surrounding each vascular bundle; few sheath cells quite large. Crystals: druses present in mesophyll. Tannins: present.

TYPE.—Sandstone precipices and adjacent cerrado, ca. 18 km west of Grão Mogul, Minas Gerais, Brazil, 950 m alt, 21 February 1969, Irwin, Reis dos Santos, Souza & Fonseca 23673 (US, holotype; NY; UB, isotypes).

DISTRIBUTION.—Brazil: Minas Gerais: On brown sand in cerrado, type-locality, 18 February 1969, Irwin et al. 23533 (NY, UB, US). This latter has somewhat smaller leaves than the type but somewhat differently shaped coronoid appendages and a style that exceeds the stamens. It is possible that this species has heterostylous flowers.