Vines and Climbing Plants of Puerto Rico and the Virgin Islands

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48 Vines and Climbing Plants of Puerto Rico and the Virgin Islands 3. THUNBERGIA Herbaceous or woody vines or less frequently erect shrubs. Leaves opposite; blades simple; stipules absent. Flowers bisexual, zygomorphic, axillary, usually solitary, with long pedicels and a pair of foliaceous bracts covering the lower portion of the corolla. Calyx short, cupuliform, truncate or dentate; corolla infundibuliform or hypocrateriform, large and showy, regular or irregular; stamens didynamous;
Vines and Climbing Plants of Puerto Rico and the Virgin Islands 49 ovary superior, bicarpellate, bilocular. Fruits capsular, globose at the base, with the apex in the form of a beak; seeds subglobose. Approximately 200 species of the Paleotropics, 12 of which have been cultivated and have become naturalized in the Neotropics. Key to the species of Thunbergia 1a. Petioles winged; corolla orange or pale yellow, with the center dark violet .................... 1. T. alata 1b. Petioles not winged; corolla white or violet, with the center white or light yellow ................2 2a. Herbaceous vine, 2-3 m in length; corolla white, with the limb 4-5 cm in diameter... 2. T. fragrans 2b. Woody vine, 10-15 m in length; corolla lilac or whitish, with the limb 6-7 cm in diameter ................ .............................................................................................. 3. T. grandiflora 1. Thunbergia alata Bojer ex Sims, Bot. Mag. 52, t. 2591. 1825. Fig. 14. G-L Susana, Viuda, Black-eye susan, Clock vine Herbaceous vine, creeping or climbing, twining, 2-3 m in length. Stems cylindrical, slender (ca. 2 mm), puberulous. Leaves opposite; blades 4.5-10.5 × 3.2-6 cm, ovate, lobed, chartaceous, the apex acute, the base subcordiform; upper surface dark green, dull, pubescent; lower surface pale green, dull, with prominent venation; petioles 4-8 cm long, winged, pubescent. Flowers axillary, solitary; pedicels pubescent, 4-5 cm long; bracts green, ovate, pubescent, 1.5 cm long, covering the calyx and the corolla tube. Calyx yellowish green, with 12 filiform lobes, ca. 4 mm long; corolla orange, pale yellow, or less frequently whitish, infundibuliform, with 5 lobes, the tube ca. 2.5 cm long, narrow at the base, dark violet inside, the lobes ca. 2.5 cm long with the apex truncate, the limb ca. 5 cm in diameter; stamens with glandular hairs on the basal portion. Capsules ca. 4 mm long, depressed-globose to 4-lobed at the base, the upper half in the form of a beak, dehiscent by two valves; seeds 2 or 4, 1.2-1.5 mm long, semicircular, reticulate. Phenology: Flowering sporadically throughout the year. Status: Exotic, very common, naturalized in Puerto Rico. Distribution: Throughout Puerto Rico, especially in moist disturbed areas, at lower to upper elevations. Also on St. Croix. Native to eastern Africa, but introduced throughout the tropics. Public forests: Cambalache, Carite, El Yunque, Guilarte, Maricao, Río Abajo, Toro Negro, and Tortuguero. 2. Thunbergia fragrans Roxb., Pl. Coromandel. 1: 47. 1796. Fig. 14. A-F SYNONYM: Thunbergia volubilis Pers. Susana blanca, Flor de nieve Herbaceous vine, twining, 2-3 m in length. Stems cylindrical, striate, slender, puberulous. Leaves opposite; blades 6.5-11 × 1.8-6 cm, ovate to lanceolate, chartaceous, the apex acute, the base truncate or subcordiform; margins undulate and ciliate; upper surface dark green, glabrous or somewhat scabrous; lower surface pale green, dull, puberulous, with prominent venation; petiole 2- 3.5 cm long, slender, pubescent, sulcate, with the base somewhat dilated. Flowers axillary, solitary or in pairs; pedicels pubescent, 5-7 cm long, striate; bracts green, membranaceous, ovate, pubescent, 1.6-2 cm long, covering the calyx. Calyx green, of 15-20 sepals, lanceolate, 3-5 mm long; corolla white, infundibuliform, with 5 lobes, the tube 2.5-4 cm long, narrow at the base, yellow inside, the limb 4-5 cm in diameter. Capsules 1- 2.5 cm long, depressed-globose at the base, the upper half in the form of a beak, dehiscent in two halves; seeds 4, globose, ca. 5 mm in diameter, pubescent, with a depression at the base. Phenology: Flowering and fruiting throughout the year.
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Acelga trepadora ..................
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Wild cucumber .....................
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Vines and Climbing Plants of Puerto Rico and the Virgin Islands

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