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FOC | Family List | FOC Vol. 4 | Salicaceae | Salix

15. Salix Sect. Heterochromae C. K. Schneider in Sargent, Pl. Wilson. 3: 121. 1916.

紫枝柳组 zi zhi liu zu

Branchlets generally purplish red, slender. Leaf blade narrowly oblong, elliptic, ovate, or broadly ovate, papery, abaxially pale, silky when young, glabrescent or glabrous, margin entire, apex acute to acuminate. Flowering coetaneous. Catkins cylindric, pedunculate; peduncle, with 2 or 3 leaflets deciduous in fruit or leaflets absent; bracts yellowish green to brown. Male flower: gland solitary, adaxial; stamens 2, distinct, rarely united at base; filaments downy proximally. Female flower: ovary silky, stipitate; style conspicuous, 2-cleft; stigma 2-lobed.

Key based on male plants

1 Catkin 3-5.5 cm; bracts oblong; gland obovate   176 Salix heterochroma
+ Catkin 1.5-3 cm; bracts obovate or elliptic; gland narrowly ovate or terete.   (2)
2 (1) Bracts obovate; anthers yellow; gland narrowly ovate   181 Salix alfredii
+ Bracts elliptic; anthers red, rarely yellow at base of catkin; gland terete   178 Salix taishanensis

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