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2. Akebia Decaisne, Arch. Mus. Hist. Nat. 1: 195. 1839.
木通属 mu tong shu
Woody climbers, deciduous or subevergreen. Monoecious. Stems twining. Winter bud outer scales numerous, persistent. Leaves alternate or clustered on short branches; petiole long; leaf blade palmately compound, 3--5(--7)-foliolate; leaflet margin entire, sinuate, or undulate. Inflorescences axillary, racemose, sometimes umbellate; bracts subtending inflorescences, persistent, scaly. Sepals usually 3(--6), purplish red or greenish white, subvalvate, reflexed at anthesis. Petals absent. Male flowers: borne apically on inflorescence. Stamens free; filaments very short; anthers incurved at anthesis. Pistillodes small. Female flowers: 1 or 2 basally on inflorescence, larger than male flowers. Carpels 3--9(--12), free, cylindric. Stigma capitate. Fruit fleshy follicles, dehiscent along abaxial suture. Seeds numerous, in several rows within pulp, slightly compressed; embryo small.
Five species: China, Japan, Korea; four species (two endemic) in China.
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| 1 |
Leaves 3(--5)-foliolate. |
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(2) |
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Leaves (3--)5(--7)-foliolate. |
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(3) |
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| 2 (1) |
Leaflet margin usually sinuate-dentate; sepals of male flowers 2--3 mm |
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3 A. trifoliata |
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Leaflet margin subentire; sepals of male flowers 1--2 mm |
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4 A. chingshuiensis |
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| 3 (1) |
Racemes 6--12 cm, 4--8(--11)-flowered; sepals of male flowers 6--8 mm; leaflets papery, abaxially glaucous |
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1 A. quinata |
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Racemes 12--18 cm, 23--35(--43)-flowered; sepals of male flowers 4--4.5 mm; leaflets subleathery, abaxially pale green |
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2 A. longeracemosa |
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Lower Taxa
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