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FOC | Family List | FOC Vol. 16 | Asclepiadaceae

5. Periploca Linnaeus, Sp. Pl. 1: 211. 1753.

杠柳属 gang liu shu

Shrubs scandent, glabrous except for flowers. Leaves with numerous lateral veins and a well-defined intramarginal vein. Cymes terminal and extra-axillary, lax. Calyx glands 5. Corolla rotate; tube short; lobes obtuse, usually hairy inside, overlapping to right. Corona inserted at base of corolla; lobes 3-fid, central segment threadlike, inflexed; lateral segments short, broad, flaplike. Filaments short, distinct; anthers dorsally hairy, connivent, adnate to stigma head; apical appendages incurved; pollen tetrads in masses, attached to a common retinaculum. Style short; stigma head convex. Follicles paired, somewhat divergent, sometimes adhering at tips.

About 10 species: temperate Asia, southern Europe, tropical Africa; five species in China (but see also Browicz's monograph of the genus [Arboretum Kùrnickie 11: 1-104. 1966], which recognized in China only two species, one with three subspecies).

1 Leaves membranous; corolla lobes reflexed, purple with a prominent, elongated, raised, pale patch along center; corona lobes glabrous   1 Periploca sepium
+ Leaves leathery or nearly so; corolla lobes erect, uniformly purple or yellow green; corona lobes puberulent to pilose.   (2)
2 (1) Corolla lobes 11-13 mm   2 Periploca tsangii
+ Corolla lobes up to 4 mm.   (3)
3 (2) Leaves narrowly lanceolate, 4-14 mm wide, 5.5-8.5 times as long as wide; corolla yellow-green, lobes sometimes glabrous   3 Periploca forrestii
+ Leaves oblanceolate to oblong-lanceolate, (7-)9-19(-25) mm wide, 2.5-4.5 times as long as wide; corolla purple, lobes always pubescent or pilose.   (4)
4 (3) Cymes ca. 2 cm, to 10-flowered   4 Periploca calophylla
+ Cymes ca. 3.5 cm, to 20- (or more)-flowered   5 Periploca floribunda

Lower Taxa


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