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Cyclobalanopsis (Bl.) Oerst.

青冈属 qing gang shu

Description from Flora of China

Quercus Linnaeus subgen. Cyclobalanopsis (Oersted) C. K. Schneider.

Trees or rarely shrubs, evergreen. Trunk bark usually smooth, rarely deeply splitting. Winter buds ovoid-globose, ovoid-conical, or rarely ovoid-ellipsoid; scales many, imbricate. Stipules extrapetiolar. Leaves spirally arranged. Male inflorescences pendulous; flowers loosely arranged or clustered on rachis; perianth usually 5- or 6-lobed; stamens as many as perianth lobes, sometimes less, filament slender; pistil rudimentary. Female inflorescences with a solitary flower or spiciform; cupules with 1 flower; perianth 5- or 6-lobed; staminodes sometimes present, small; ovary 3-loculed; styles (2 or)3(or 4); stigmas capitate or dilated. Cupules solitary; bracts scalelike, whorled, connate, in rings or spirally fused. Nut usually 1 per cupule; abortive ovule persisting in subapical, lateral, or basal part of seed. Germination hypogeal.

About 150 species: mainly in tropical and subtropical Asia; 69 species (43 endemic) in China.

Cyclobalanopsis is often treated as a subgenus of Quercus, with all other species of Quercus belonging to subgenus Quercus.

Species of Cyclobalanopsis are among the main components of broad-leaved evergreen forests in China’s southern provinces N to the Qinling Mountains and the Huai He basin. In general, Cyclobalanopsis has a more southern distribution and Quercus a more northern distribution.

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  • Lectotypification and new synonymy in Quercus subg. Cyclobalanopsis (Fagaceae)
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