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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.
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Key based on vegetative characters
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| 1 |
Shrubs or small trees; branches dark purplish red or yellowish brown; leaf blade elliptic to lanceolate or ovate-lanceolate |
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176 Salix heterochroma |
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Shrubs; branches russet, brownish green, or brownish purple; leaf blade ovate-orbicular, ovate, broadly rhomboid-ovate, or elliptic to narrowly elliptic. |
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(2) |
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| 2 (1) |
Leaves broadly ovate, broadly rhomboid-ovate, or ovate. |
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(3) |
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Leaf blade elliptic, narrowly elliptic, or oblong-elliptic. |
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(4) |
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| 3 (2) |
Leaf base rounded; branchlets purplish brown |
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181 Salix alfredii |
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Leaf base shallowly cordate to rounded; branchlets brownish red to russet |
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178 Salix taishanensis |
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| 4 (2) |
Leaf blade abaxially glabrous, base cuneate |
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177 Salix paraheterochroma |
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Leaf blade abaxially ± pilose, based rounded. |
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(5) |
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| 5 (4) |
Bracts abaxially with dense, long hairs; ovary narrowly ovoid-conical, downy |
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179 Salix trichocarpa |
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Bracts abaxially glabrous or pilose at apex; ovary slightly oblong-ovoid, glabrous proximally |
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180 Salix yadongensis |
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List of Keys
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Lower Taxa
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Treatments in Other Floras @ www.efloras.org
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