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