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1. Rhamnus subg. Frangula (Miller) S. F. Gray, Nat. Arr. Brit. Pl. 2: 621. 1821.
裸芽亚属 luo ya ya shu
Frangula Miller, Gard. Dict. Abr., ed. 4. 1754.
Trees or shrubs, unarmed. Young branches hairy, glabrescent. Winter buds naked, without scales. Leaves alternate, entire or dentate. Flowers bisexual, 5-merous. Calyx tube cup-shaped; sepals 5, adaxially ± distinctly keeled. Petals broadly obovate to obcordate, base shortly clawed, apex ± deeply emarginate. Stamens equaling petals or slightly longer. Disk thin, lining calyx tube. Ovary superior, globose, 2- or 3-loculed; style simple, with 2- or 3-lobed stigma. Berrylike drupe with 3 loosely adhering, ventrally dehiscing stones. Seeds lenticular, with cartilaginous beak, never furrowed abaxially.
About 50 species: mainly in North America, a few species in N Africa, E Asia, and Europe; five species (three endemic) in China.
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| 1 |
Leaves entire, broadly elliptic or oblong; flowers usually 2- to few fascicled at leaf axils, rarely solitary, peduncles absent; style simple. |
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1 R. frangula |
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Leaves dentate or subentire; flowers few to 10 in cymes or subumbels on peduncles, often hairy; style lobed, rarely simple |
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(2) |
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| 2 (1) |
Leaves subentire or inconspicuously denticulate, abaxially incanous or yellow tomentose; style deeply 3-lobed to base. |
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5 R. henryi |
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Leaves dentate, abaxially pubescent to glabrous; style 2- or 3-semilobed or simple |
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(3) |
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| 3 (2) |
Leaf blade obovate-elliptic or obovate, abaxially pubescent or tomentulose or at least densely pubescent on veins, petiole densely pubescent; style and stigma undivided. |
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2 R. crenata |
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Leaf blade elliptic or oblong, abaxially glabrous or hirsute on veins, petiole glabrous or puberulent; style undivided, stigma 2- or 3-lobed |
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(4) |
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| 4 (3) |
Leaf blade 6-11 × 2-4 cm, lateral veins 7-10 pairs, petiole 1.2-2.2 cm; peduncles 1.5-4 cm; stigma 2- or 3-lobed. |
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3 R. longipes |
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Leaf blade 3-5 × 1-1.8 cm, lateral veins 5 or 6 pairs, petiole 0.5-1.2 cm; peduncles 0.2-1 cm; stigma 2-lobed. |
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4 R. rhododendriphylla |
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Lower Taxa
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