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(Last Modified On 5/30/2013)
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(Last Modified On 5/30/2013)
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Genus
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Marsdenia R. Br.
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PlaceOfPublication
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Mem. Wern. Soc. 1: 28. 1811.
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Note
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TYPE: M. tinctoria R. Br.
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Description
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Herbaceous or woody vines, rarely erect, pubescent or glabrous. Leaves op- posite. Inflorescences umbelliform or paniculate, terminal or axillary. Flowers This content downloaded from 192.104.39.2 on Thu, 23 May 2013 11:56:49 AMAll use subject to JSTOR Terms and Conditions128 ANNALS OF THE MISSOURI BOTANICAL GARDEN [VOL. 62 generally small, tubular; calyx 5-lobed, 5- to several-glandular within at the base or eglandular, the lobes acute or obtuse; corolla campanulate to urceolate or occasionally subrotate, 5-lobed, the throat usually closed or nearly so by dense pubescence or an annulus, rarely glabrous within, the lobes obtuse; stamens inserted near the base of the corolla, the corona 5-parted, the segments adnate to the staminal column and frequently to the dorsal side of the anthers, usually free from the corolla, erect, apically free, flattened, fleshy or membranaceous, the filaments connate into a short tube, the anthers with a thin inflexed apical membrane; pollinia strictly erect, generally ovoid or narrowly oblong; stigma usually apically convex or rostrate, occasionally flat or depressed. Fruit usually single follicles, thick, + ellipsoidal in outline, smooth or occasionally longitudinally winged, pericarp often hard and woody when dry; seeds comose.
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Habit
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vines
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Distribution
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There are about 50 species of Marsdenia in the tropics and subtropics of the New World and possibly an equal number indigenous to the Old World. About 25 species are found in Mexico and Central America.
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Reference
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Rothe, W. tber die Gattung Marsdenia R. Br. und die Stammpflange der Condurangorinde. Bot. Jahrb. (Syst.) 52: 354-434. 1915.
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Key
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a. Flowers pinkish, striped with purple; corolla lobes linear ...... 1. M. trivirgulata aa. Flowers green, yellow, or red; corolla lobes elliptic, ovate, or deltoid. b. Leaves densely white villous beneath; flowers green ...... 4. M. panamensis bb. Leaves glabrous to glabrate beneath, not villous; flowers red, yellow, or green. c. Flowers greenish to yellowish; inflorescence usually with less than 10 flowers. d. Pedicels filiform, more than 1 cm long; stems with dense warty excrescences; highland species ...... 7. M. rotheana dd. Pedicels stouter, less than 5 mm long; stems smooth; lowland species ...... 6. M. crassipes cc. Flowers red or red brown; inflorescence usually with 8 or more flowers. e. Corolla tube constricted at the throat, the lobes conspicuously short pilose; leaves mostly less than 10 cm long ...... 2. M. margaritaria ee. Corolla tube not constricted, lobes glabrous on the surface; leaves mostly more than 10 cm long. f. Inflorescence many-flowered; calyx lobes ovate; leaf bases cordate ...... 3. M. maculata ff. Inflorescence with 8-12 flowers; calyx lobes orbicular or nearly so; leaf bases rounded ...... 5. M. dressleri
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