Orthosia dusenii (Malme) Fontella [Familia Apocynaceae]

Descripción y datos generales

Publicación original

Malme. (1990). Bradea, 5(39), 381.

Status

Endémica

Hábito

Enredadera

Ciclo de vida

Perenne

Descripción morfológica

Plants ascending or scrambling, non-twining, heav ily and dichasially, usually distinctly acrotonically branched, with distinct long and short shoots; inter nodes sparsely to densely hirsute along 2 lines with re flexed trichomes 150–200 µm; internodes of long shoots 25–60 mm, 1–2 mm diam.; internodes of short shoots 7–15 mm, 0.5–1 mm diam. Leaves distichous, with pet ioles 1–2 mm; colleters absent; blades herbaceous to slightly coriaceous, slightly discolorous, 8–15 × 2.5–7 mm, ovate, basally subacute, apically acute to acumi- nate, marginally weakly and distantly ciliate, glabrous except for few trichomes on proximal part of adaxial midrib; lateral veins seemingly absent. Inflorescences axillary, always 1 per node, sciadioidal, 2- to 5-flowered, 1 to 3 flowers open synchronously, (sub-)sessile; floral bracts ca. 0.75 × 0.45 mm, ovate, reddish, abaxially with trichomes, smooth; pedicels 2.5–3.5 mm, uni formly sparsely puberulous with appressed trichomes ca. 120 µm. Flower buds ca. 1.5 × 1 mm, ovoid; calyx campanulate, abaxially with few trichomes in basal cen tral part of lobes, lobes basally fused, ca. 1 × 0.7 mm, ovate, apically obtuse, with 1 to 2 colleter(s) in sinuses; corolla cyathiform, 2–2.3 mm, ca. 2 mm diam., purple; lobes ca. 1.2 mm wide, basally fused, ovate, apically acute, patent to incurved. Staminal corona basally fused, cream to yellow (fide Hatschbach 17832 and 18207), 0.4–0.5 mm, reaching less than 1/2 of gyno stegium length; lobes ovate to rectangular, obtuse, pat ent, fleshy. Gynostegium 0.6–0.7 × 0.7–0.8 mm, slightly broader than long, sessile; slightly conical; stamens with filament ca. 100 µm, anthers ca. 400 µm, longer than wide, rectangular, abaxially slightly biconvex; an ther wings 300–350 µm, not extending along whole length of anther, at ca. 25° angle, in same plane as anther, basally forming distinct “mouth,” anther wings of adjacent anthers parallel to each other; connective appendages ca. 150 × 300 µm, strongly inflexed. Polli narium with corpusculum ca. 100 × 45 µm, ellipsoid; caudicles ca. 100 µm, S-shaped, concave-convex; pol linia subapically attached to caudicles, ca. 140 × 70 µm, ovate in cross-section, ovoid, slightly spreading. Style-head ca. 160 × 650 µm diam., upper part flat to slightly umbonate. Follicles and seeds unknown.

Material tipo

Basónimo: Metastelma dusenii Malme

Distribución

Distribución por país

Sinonimia (1 sinónimo)

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Referencias bibliográficas por País

Vouchers — Ejemplares examinados

Colecciones de referencia

Registros de herbario determinados actualmente con este nombre.

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Estado de conservación

Notas y observaciones