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(Last Modified On 7/30/2013)
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(Last Modified On 7/30/2013)
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Genus
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Thunbergia Retz.
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PlaceOfPublication
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Physiogr. Salsk. Handl. 1(3): 163. (1780).
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Note
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TYPE: T. capensis Retz. nom. cons. not T. montin, Kongl. Vetensk. Acad. Handl. 34: 288. tab. 11. 1773 (Rubiaceae) nom. rejic.
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Description
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Herbaceous vines or shrubs. Leaves hastate, rhomboid or ovate. Flowers large, peduncled, borne singly in axils or in terminal racemes; bracts 2, foliaceous, large; calyx short, cupuliform, truncate or toothed; corolla 5-merous, funnelform; anthers 4, didynamous, attached near the base of the corolla tube, anthers with an apiculate connective; ovary fleshy, the style apically dilated; ovary basally subtended by a conspicuous fleshy nectary (rounded, entire disc). Capsule basally globose extending abruptly into a flattened beak; seeds 2 in each cavity, semiglobose, borne on papilliform funicles.
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Habit
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vines or shrubs
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Note
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This genus is chiefly African. Those species found in the neotropics are either under cultivation or have escaped from cultivation. Thunbergia alata is so thoroughly established in some regions that it appears to be native.
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Distribution
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Africa
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Key
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a. Petioles winged; flowers orange or yellow often with a dark purple throat; rarely white ...... 1. T. alata aa. Petioles not winged; flowers not colored as above. b. Erect shrub; leaves small, to around 5.5 cm long ...... 2. T. erecta bb. Vine; leaves to more than 5.5 cm long. c. Calyx bearing ca. 12 slender, subulate teeth; corolla tube 2.5 cm long or less, pure white ...... 3. T. fragrans cc. Calyx annular; corolla tube 3-4 cm long, blue or lavender with yellow throat ...... 4. T. grandiflora
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