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(Last Modified On 5/21/2013)
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(Last Modified On 5/21/2013)
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Species
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Arrabidaea oxycarpa Urb.,
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PlaceOfPublication
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Feddes Repert. 14: 301. 1916.
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Note
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TYPE: Trinidad, Broadway 3188 (not seen).
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Description
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Vine, the branchlets terete, lepidote to slightly puberulous, when young dry- ing black with contrasting whitish lenticels, without interpetiolar glandular fields; pseudostipules small, blunt, inconspicuous. Leaves 3-foliolate or 2-foliolate with a simple tendril, the blade elliptic, somewhat acuminate, rounded to broadly cuneate at base, 3-12 cm long and 1-6 cm wide (smaller at base of branchlet), chartaceous (usually immature and membranaceous when in flower), slightly lepidote, otherwise glabrous except for simple trichomes in axils of lateral nerves beneath, drying lead gray to blackish, the main veins darker beneath, the ultimate venation intricately reticulated; petiolules 0.2-3 cm long, the terminal longer, laterals shorter, petiole 1.5-5 cm long, lepidote, drying black. Inflorescence a reduced, few-flowered panicle terminal on young lateral branchlets, its branches lepidote and puberulous, drying blackish, bracts minute. Flowers with the calyx cupular, 3-4 mm long and 3-4 mm wide, evenly but minutely 5-denticulate, lepidote and puberulous, usually with conspicuous plate-shaped glands near margin, drying dark; corolla magenta, tubular campanulate, 3-3.5 cm long and 1.3-1.4 cm wide, the tube 2.2-2.4 cm long, the lobes ca. 1 cm long, densely puberulous without and on lobes within, the trichomes somewhat glandular, the tube inside glabrous except for trichomes at base of stamens; stamens didynamous, the anther thecae divaricate, 3 mm long, the connective slightly extended, the longer filaments 1.6-1.7 cm long, the shorter filaments 1.2-1.3 cm long, the staminode 6-7 mm long; inserted 5 mm from base of corolla tube; pistil 1.6-1.7 cm long, the ovary linear oblong, 2-3 mm long and 1 mm wide, minutely lepidote, the ovules 2-seriate in each locule; disk pulvinate, 1 mm long and 1.5-2 mm wide. Capsule linear, compressed, tapered at both ends, 19-23 cm long and 1 cm wide, drying brown or blackish, glabrous or slightly lepidote, the midrib evident but slightly raised and inconspicuous, the margins somewhat raised; seeds thin, flat, bialate, 0.7-0.8 cm long and 1.7-2.8 cm wide, the wings sharply divided into a brown basal part and a hyaline membranaceous tip.
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Habit
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Vine
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Note
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An uncommon vine of the premontane moist forest and edaphically dry areas of the tropical moist forest, A. oxycarpa has been previously known only from Trinidad. - I have seen only a single specimen of this species from Trinidad. However, I have recently examined a series of specimens from Venezuela which I would identify with A. oxycarpa and am now convinced that two fruiting collections from the Canal Zone which I had tentatively identified with A. florida are actually A. oxycarpa. Arrabidaea oxycarpa differs from A. florida in mature branchlets with a loose, inconspicuously lenticellate, somewhat wrinkled epi- dermis in contrast to the tight, unwrinkled, uniformly small-lenticellate epidermis of the latter. The leaves of A. oxycarpa also tend to dry a darker gray with a more intricate pattern of ultimate reticulations below. In flower A. oxycarpa is characterized by young branchlets which dry blackish with conspicuous light lenticels and by its reduced, few-flowered inflorescences.
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Distribution
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previously known only from Trinidad.
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Specimen
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CANAL ZONE: Boy Scout Camp Road near Madden Lake, Gentry 5504 (MO). Farfan Beach Road, Kirkbride & Elias 60 (MO, NY, SCZ).
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