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FOC | Family List | FOC Vol. 4 | Cupressaceae

6. Chamaecyparis Spach, Hist. Nat. Veg. 11: 329. 1841.

扁柏属 bian bai shu

Trees evergreen, monoecious; branchlets arranged in a plane, flattened. Leaves decussate, scalelike, usually dimorphic along branchlets: facial pairs closely appressed, ovate or rhombic-ovate; lateral pairs boat-shaped, overlapping margins of facial pairs. Pollen cones ovoid or oblong; microsporophylls 6-8, each with 2-4 pollen sacs. Seed cones terminal on branchlets, solitary, globose or oblong, dehiscent when mature in 1st year; cone scales 8-12, peltate, woody, each fertile scale bearing (1 or)2(-5) seeds; free bract apex a small mucro. Seeds with lateral, narrow wings. Cotyledons 2.

Six species: E Asia, North America; five species (one endemic, three introduced) in China.

1 Leaves on lower side of branchlets not or only slightly glaucous.   (2)
+ Leaves on lower side of branchlets glaucous.   (3)
2 (1) Seed cones 4-9 mm in diam.; leaves usually with circular gland   1 Chamaecyparis thyoides
+ Seed cones 8-12 mm in diam.; leaves with linear to circular abaxial gland, or gland absent   2 Chamaecyparis lawsoniana
3 (1) Facial leaves eglandular, obtuse or subacute at apex   5 Chamaecyparis obtusa
+ Facial leaves with an abaxial, sometimes obscure gland, acute to acuminate at apex.   (4)
4 (3) Seed cones globose, ca. 6 mm in diam.   3 Chamaecyparis pisifera
+ Seed cones oblong or oblong-ovoid, 5-9 mm in diam.   4 Chamaecyparis formosensis

Lower Taxa


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