| 1 |
Branchlets pendulous. |
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(2) |
| + |
Branchlets erect or spreading, not pendulous (except sometimes in S. matsudana). |
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(3) |
| |
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|
|
| 2 (1) |
Filaments ca. as long as or slightly longer than bracts; bracts lanceolate |
|
36 Salix babylonica |
| + |
Filaments more than 2 × as long as bracts; bracts elliptic |
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37 Salix pseudolasiogyne |
| |
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| 3 (1) |
Stamens 2; filaments completely connate. |
|
(4) |
| + |
Stamens 2, rarely 3 or 4(or 5) or with intermixture of 3 or 4(or 5 in same catkin); filaments free or connate proximally or at base. |
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(5) |
| |
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| 4 (3) |
Filaments 5-6 × as long as bracts |
|
47 Salix longistamina |
| + |
Filaments ca. 3 × as long as bracts |
|
46 Salix pierotii |
| |
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| 5 (3) |
Branchlets brownish green |
|
28 Salix fragilis |
| + |
Branchlets not brownish green. |
|
(6) |
| |
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|
|
| 6 (5) |
Young branchlets tomentose; young leaves sericeous. |
|
(7) |
| + |
Young branchlets and leaves glabrous or pilose, neither tomentose nor sericeous. |
|
(9) |
| |
|
|
|
| 7 (6) |
Catkin 3-5 cm; peduncle 5-10 mm; bracts ciliate, adaxially glabrous, abaxially glabrous or pilose at base |
|
27 Salix alba |
| + |
Catkin less than 3 cm; peduncle 3-6 mm; bracts pilose on both surfaces. |
|
(8) |
| |
|
|
|
| 8 (7) |
Filaments connate at base; bracts obovate |
|
35 Salix chienii |
| + |
Filaments free; bracts ovate-lanceolate or ovate-oblong |
|
29 Salix chikungensis |
| |
|
|
|
| 9 (6) |
Catkin 3.5-4.5 cm; stamens usually 2, with some intermixture of 3 or 4(or 5) usually in proximal part of catkin |
|
26 Salix heteromera |
| + |
Catkin less than 3.5 cm; stamens 2. |
|
(10) |
| |
|
|
|
| 10 (9) |
Peduncle 8-15 mm. |
|
(11) |
| + |
Peduncle less than 7 mm. |
|
(12) |
| |
|
|
|
| 11 (10) |
Filaments glabrous |
|
45 Salix sericocarpa |
| + |
Filaments downy proximally |
|
30 Salix jishiensis |
| |
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|
|
| 12 (10) |
Branchlets reddish brown or purplish brown; bracts obovate-orbicular |
|
34 Salix sphaeronymphoides |
| + |
Branchlets not red or purple; bracts ovate, long ovate, or ovate-elliptic to oblong. |
|
(13) |
| |
|
|
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| 13 (12) |
Catkin peduncle 4-5 mm; bracts with long, yellow hairs abaxially and at margin, adaxially subglabrous |
|
39 Salix bikouensis |
| + |
Catkin subsessile or shortly pedunculate; bracts without long, yellow hairs. |
|
(14) |
| |
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|
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| 14 (13) |
Catkin shortly pedunculate; bracts ovate, pilose at base; anthers yellow |
|
32 Salix matsudana |
| + |
Catkin subsessile; bracts ovate-oblong or ovate-elliptic; anthers usually red. |
|
(15) |
| |
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|
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| 15 (14) |
Bracts pilose on both surfaces or adaxially subglabrous, apex acute; young leaves abaxially pale; filaments free, sometimes connate at base |
|
41 Salix koreensis |
| + |
Bracts yellowish pubescent, apex obtuse or retuse; young leaves abaxially with a bluish green tinge; filaments connate proximally, rarely free |
|
40 Salix eriocarpa |
