Rinorea hymenosepala S.F.Blake
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Authority
Hekking, W. H. A. 1988. violaceae Part l—Rinorea and Rinoreocarpus. Fl. Neotrop. Monogr. 46: i-ii, 1-208. (Published by NYBG Press)
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Family
Violaceae
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Scientific Name
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Type
Type. Colombia. Antioquía: Forest of Río Magdalena, 120-170 m, 12 Jan 1918 (fl), Pennell 3783 (holotype, NY; photograph US).
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Description
Species Description - Treelet ca. 2 m tall. Branchlets orange-brown to purplish when dried, provided with small whitish callose lenticels, ferruginous hispid and hispidulous. Leaves apparently opposite or ternate at the apex of the branchlets, alternate near the base; petioles 1.5-10 mm long, ferruginous hispid(ulous) above, ferruginous strigose beneath; stipules deciduous, narrowly ovate, gradually acuminate, 2.25-5 x 0.75-1.5 mm, herbaceous, sometimes ferruginous hispid along the costa, margin scarious and ferruginous ciliolate; lamina obovate, acuminate, 5.5-17 x 2.5-7 cm, papery to herbaceous, slightly whitish to brownish hispidulous to glabrescent on both sides; costa above whitish to brownish hispidulous, ferruginous to brownish hispid(ulous) beneath; domatia wanting; lateral veins 11-18 pairs (acumen excluded), whitish to ferruginous hispidulous) to glabrescent on both sides; tertiary venation ± scalariform, glabrescent or sparsely whitish to brownish hispidulous; base rounded to cuneate, asymmetric, oblique, rounded, subcordate or subauriculate at the petiole; margin serrate to crenate, mucronulate; acumen (0-) 1.5- 2.5 cm long, apex (sub)obtuse, mucronulate. Inflorescences axillary, lateral and subterminal, solitary, thyrsoid, more or less laxiflorous, 4.5-7 x 1-1.75 cm; central axis ferruginous hirsute, golden to yellowish hirtellous, cymules 1-7 flowered; common peduncle 1.25-2 mm long, golden to brownish hirtellous; pedicels 2.5-3 mm long, articulate near the middle or near the base, golden to brownish hirtellous; bracts and bractlets narrowly ovate, gradually acuminate, herbaceous, scarious near the margin, sometimes golden to whitish hispidulous, costate, veined, ciliolate; bracts 3.5-4.25 x 1-2 mm, 9-veined; bractlets 1-1.25 x 0.3-0.4 mm. Flower buds ovoid to conical, obtusish. Flowers drooping, white. Sepals (sub)equal, narrowly ovate to deltoid, acuminate, 2.25-3 x ca. 0.75 mm, scarious, golden pilose near the apex of the costa, obscurely 2-4 veined, margin whitish to golden ciliate, apex subacute. Petals ovate, 4.25-6 x 1.75-2.5 mm, herbaceous, glabrous or rarely sparsely pilose along the costa, margin not ciliolate, apex obtuse. Stamens 3.5-3.75 mm long; filaments free, 0.40.5 x ca. 0.25 mm, glabrous; dorsal glands free, adnate to the filaments, narrowly elliptic, ca. 0.75 x ca. 0.25 mm, slightly longer than the filaments, carnose, glabrous; anthers ovoid, 1.5-1.75 x ca. 0.75 mm, glabrous, apex of thecae obtuse to rounded, usually appendaged by l(-2) cusps, 0.4-0.8 x 0.1 mm; connective outside narrowly deltoid, acute, 1.25 x 0.25 mm, glabrous; connective scales lateral as well as apical, narrowly elliptic, 2.75-3.25 x 0.75-1 mm, scarious, yellowish when fresh, brownish when dried, margin erose to fringed especially near the base, apex rounded, suberose to subentire. Ovary subglobose, 1-1.25 x 0.75-1.25 mm, slanting to erect brownish pilose; ovules one per placenta. Style filiform, erect or slightly curved, 3-3.75 mm long, exceeding the stamens by 0.5-1 mm, predominantly glabrous. Fruits unknown.
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Discussion
Rinorea hymenosepala is the only neotropical Rinorea in which only the apical leaves are apparently opposite, while the lower ones are still alternate. It is closely related to R. ulmifolia. For differentiating remarks see under that species.
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Distribution
Rinorea hymenosepala is known only from the northern valley of the Río Magdalena and near the Sierra Nevada de Santa Marta, including similarly-named forest refuges. Soil and altitude unknown. Flowering specimens have been collected in January and September. Fruiting specimens are unknown.
Colombia South America| César Colombia South America|