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FOC | Family List | FOC Vol. 16 | Convolvulaceae

2. Evolvulus Linnaeus, Sp. Pl., ed. 2. 391. 1762.

土丁桂属 tu ding gui shu

Herbs, subshrubs, or shrubs. Stems never twining. Leaves petiolate or sessile; leaf blade entire. Flowers 1 to few, pedicellate or sessile in leaf axils, or several in terminal spikes or capitula; bracts tiny. Sepals free, equal or subequal. Corolla rotate, funnelform, or salverform; limb ± entire to 5-lobed, midpetaline bands often pilose outside. Stamens included or exserted; pollen globose, rugate, not spiny. Disc cupular or absent. Ovary glabrous or pilose, 2-loculed; ovules 2 per locule. Styles 2, filiform, free or united basally, each 2-cleft; stigma filiform, terete or slightly clavate. Capsule globose or ovoid, usually 4-valved. Seeds 1-4, smooth or minutely tuberculate, glabrous.

About 100 species: all native to North America (S United States) and South America, with two widely naturalized in the tropical and subtropical regions of the eastern hemisphere; two species in China.

Van Ooststroom's (Meded. Bot. Mus. Herb. Rijks Univ. Utrecht 14: 1-267. 1934) monograph of Evolvulus is by and large accepted today.

1 Leaves oblong, elliptic, spatulate, or circular; peduncles present; sepals lanceolate, apex acute or acuminate; corolla pale blue or white   1 Evolvulus alsinoides
+ Leaves nearly circular; peduncles absent; sepals ovate-oblong to oblong, apex obtuse or acute; corolla white or yellowish   2 Evolvulus nummularius

Lower Taxa


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