Allamanda L., Mant. Pl. 2: 146. 1771; Benth. & Hook. f., Gen. Pl. 2: 690. 1873; DC., Prodr.: 318. 1844; Bailey, St. Cyclop. Hort. 1: 246. 1947; Bor & Raizada, Some Beaut. Ind. Climb. and Shrubs 195. 1954; Fl. China @ eFloras.org 16: 165. 1995; Nazim. & Qaiser, Fl. Pak. @ eFloras.org p. 4. .

Shrubs, erect or trailing with milky latex. Leaves whorled or opposite, rarely alternate above, with axillary glands. Inflorescence few- to many-flowered cymes, terminal or axillary. Flowers actinomorphic, bisexual, 5-merous, hypogynous, large and showy, yellow or purple. Calyx 5-partite, lobes more or less free and unequal, lanceolate, acute, eglandular. Corolla yellow or purple, funnelform, 5-lobed, convolute, lobes overlapping to left; tube inflated below throat, narrow part with fringed scales. Stamens 5, included, inserted at narrow part of corolla; filaments very short; anthers narrowly oblong or lanceolate, acuminate, base rounded or shortly sagittate, coherent with pistil head. Disc thick, annular, obscurely 5-lobed or entire. Carpels 2, syncarpous; ovary unilocular with two parietal placentas, ovules numerous; style filiform; pistil head thick, with a membranous reflexed rim, apex conical, 2-lobed. Fruit a capsule, globose or subglobose, spiny, 2-valved. Seeds many, compressed, winged or with a membranous margin.

15 species

Allamanda blanchetii , A. DC. in A.P. de Candolle, Prodr. 8: 319. 1844; A. violacea Gardner in H.B. Fielding & G. Gardner, Sert. Pl. 2: t.41.

An evergreen shrubby plant, up to 2m tall, when given support attain much more height. Stem and leaves with milky latex. Branches circular, green, densely hairy with short and long hairs. Leaves exstipulate, mostly in whorls of 4, less commonly in groups of 2, 3 or 5; petiole very short, 2-4 mm long; leaf blade coriaceous, 8-14 cm x 5-8.5 cm, obovate, margin entire, ciliate, apex abruptly acuminate and base cuneate; upper surface dark green and lower pale, both surfaces hairy, adaxial surface scabrid and abaxial surface pilose, hairs very prominent on veins. Inflorescence axillary or a terminal cyme with few flowers; peduncle short, pubescent. Flowers actinomorphic or slightly zygomorphic, bisexual, 5-merous, hypogynous, large, showy, rose purple, 9.5-12 cm long and 10-11 cm across; bracts +/- ovate, ca. 1.3 cm x 0.7 cm, sparsely pubescent outside, pale green; pedicels ca.10 mm long, pubescent. Sepals 5, less commonly 3 or 4, free, unequal, 1.7-2.3 cm x 0.3-1 cm, lanceolate-ovate, acuminate, sparsely pubescent outside. Corolla rose purple, more intense in throat, 6-8 cm long; proximal most part narrow tubular, cylindrical, ca. 3.5 cm long, glabrous; distal half (throat) funnelform, 3-4.5 cm x 3.5 cm, dark purple within, its lower narrow part with fringed scales forming a cone above stamens; limb 10-11 cm across, lobes 5, orbicular-rotundate, ca. 4 cm x 5-6 cm, glabrous, overlapping to left. Stamens 5, inserted in the throat at junction with corolla tube; anthers ca. 5 mm long, narrowly triangular, acuminate, base shortly sagittate; filaments very short; stamens covered with fringed scales above and pilose with white hairs below filaments in cylindrical tube; anthers enclose pistil head. Disc thick, annular, 5-lobed. Carpels 2, syncarpous; ovary ovoid, ca. 2 mm x 1.5 mm, unilocular with 2 parietal placentas, ovules numerous; style filiform, ca. 3 cm long; pistil head thick, hour-glass-shaped, with a membranous reflexed rim, apex conical, 2-lobed.

Fruit and seeds not observed.

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