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| 1 |
Flowering precocious; catkin sessile or shortly pedunculate, with 2 or 3 scalelike leaflets. |
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(2) |
| + |
Flowering coetaneous or slightly serotinous; catkin long pedunculate, with 2-5 leaflets. |
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(5) |
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| 2 (1) |
Catkin opposite |
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158 Salix salwinensis |
| + |
Catkin alternate. |
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(3) |
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| 3 (2) |
Catkin ellipsoid or shortly cylindric, ca. 2.5 × 1.5 cm; bracts prominently dentate, abaxially with hairs longer than bracts |
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164 Salix sikkimensis |
| + |
Catkin cylindric, 2-4 cm, less than 1 cm thick; bracts not dentate, hairs ca. 1/2 as long as bracts. |
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(4) |
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| 4 (3) |
Unfurling young leaf blade obovate-elliptic to obovate-lanceolate, rarely elliptic, abaxially glabrous or usually comose along veings, base cuneate or rounded-cuneate, apex rounded or rounded-obtuse,not tomentose; fallen leaves from previous year rust colored |
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155 Salix spodiophylla |
| + |
Unfurling young leaf blade elliptic or oblong abaxially tomentose, base rounded, apex acute; fallen leaves from previous year adaxially grayish brown, abaxially grayish white, persistently tomentose |
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156 Salix balfouriana |
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| 5 (1) |
Young leaves abaxially sericeous, shiny; largest leaves of peduncles to 1-4 cm at anthesis. |
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(6) |
| + |
Young leaves abaxially white tomentose or sparsely villous, largest leaves of peduncle 3-9 cm at anthesis. |
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(9) |
| |
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| 6 (5) |
Peduncle less than 1 cm; leaflets on peduncle oblanceolate or obovate-oblong, base cuneate, apex rounded or rounded-obtuse. |
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(7) |
| + |
Peduncle 1-2 cm; leaflets on peduncles broadly oblong or elliptic, base rounded, apex acute or rounded-obtuse. |
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(8) |
| |
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| 7 (6) |
Catkin more than 6 mm thick |
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159 Salix psilostigma |
| + |
Catkin 4-6 mm thick |
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160 Salix daliensis |
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| 8 (6) |
Catkin long and slender, 7-10 × ca. 0.5 cm; young leaf blade lanceolate, apex acute to acuminate |
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153 Salix phaidima |
| + |
Catkin 3.5-6 × ca. 1 cm; young leaf blade oblong or narrowly elliptic, rarely lanceolate, apex acute |
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163 Salix daltoniana |
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| 9 (5) |
Catkin 1-1.5 cm thick. |
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(10) |
| + |
Catkin less than 1 cm thick. |
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(11) |
| |
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| 10 (9) |
Catkins terminal on leafy branchlets; bracts truncate at apex |
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166 Salix bistyla |
| + |
Catkins lateral; peduncle with 3 or 4 leaflets; bracts obtuse-rounded at apex |
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167 Salix fengiana |
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| 11 (9) |
Catkin long, slender, 7-12 × 0.7-0.9 cm at anthesis. |
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(12) |
| + |
Catkin shorter, thicker, 4(-7) × ca. 1 cm at peak of anthesis. |
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(14) |
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| 12 (11) |
Bracts with 3 or 4 prominent, glandular teeth at apex; filaments downy throughout |
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152 Salix phanera |
| + |
Bracts without glandular teeth at apex, entire or somewhat incised; filaments glabrous or downy proximally. |
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(13) |
| |
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| 13 (12) |
Filaments glabrous; bracts narrowly obovate |
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148 Salix fargesii |
| + |
Filaments pilose proximally; bracts ovate-orbicular |
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157 Salix argyrophegga |
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| 14 (11) |
Leaf margin entire, glandular dentate, or indistinctly loosely serrulate distally. |
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(15) |
| + |
Leaf margin serrate, at least on distal part of branchlets. |
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(16) |
| |
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| 15 (14) |
Young leaf blade elliptic or obovate-elliptic |
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149 Salix ernestii |
| + |
Young leaf blade obovate to oblanceolate |
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150 Salix eriostachya |
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| 16 (14) |
Young leaf blade obovate-elliptic to obovate-lanceolate |
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151 Salix plocotricha |
| + |
Young leaf blade obovate-oblong or narrowly obovate-elliptic, rarely elliptic |
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154 Salix spathulifolia |
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