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5. Juglans Linnaeus, Sp. Pl. 2: 997. 1753.
胡桃属 hu tao shu
Trees or rarely shrubs, deciduous, monoecious. Branchlets with chambered pith. Terminal buds with false-valved scales. Leaves odd-pinnate; leaflets 5-31, margin serrate or rarely entire. Inflorescences lateral or terminal on old or new growth; male spike separate from female spike, solitary, lateral on old growth, pendulous; female spike terminal on new growth, erect. Flowers anemophilous. Male flowers with an entire bract; bracteoles 2; sepals 4; stamens usually numerous, 6-40, anthers glabrous or occasionally with a few bristly hairs. Female flowers with an entire bract adnate to ovary, free at apex; bracteoles 2, adnate to ovary, free at apex; sepals 4, adnate to ovary, free at apex; style elongate with recurved branches; stigmas carinal, 2-lobed, plumose. Fruiting spike erect or pendulous. Fruit a drupelike nut with a thick, irregularly dehiscent or indehiscent husk covering a wrinkled or rough shell 2-4-chambered at base. Germination hypogeal.
About 20 species: mainly temperate and subtropical areas of N hemisphere, extending into South America; three species in China.
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| 1 |
Leaflets abaxially pubescent or rarely glabrescent, margin serrate or rarely serrulate; nuts 2-chambered at base; husk indehiscent; shell rough ridged and deeply pitted |
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3 Juglans mandshurica |
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Leaflets abaxially glabrous except in axils of midvein and secondary veins, margin entire to minutely serrulate; nuts 4-chambered at base; husk irregularly dehiscent into 4 valves; shell wrinkled or smooth ridged and deeply pitted. |
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(2) |
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| 2 (1) |
Leaflets 5-9; shell wrinkled, without prominent ridges |
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1 Juglans regia |
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Leaflets 9-15; shell smooth-ridged with deep pits and depressions and 2 or more prominent ridges |
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2 Juglans sigillata |
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Lower Taxa
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