| 1 |
Leaves usually less than 5 mm. |
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(2) |
| + |
Leaves usually more than 5 mm. |
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(5) |
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| 2 (1) |
Leaf margin with a few conspicuous teeth in distal 1/2, proximally entire. |
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(3) |
| + |
Leaf margin entire. |
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(4) |
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| 3 (2) |
Leaf blade obovate, ca. 3(-7) mm, green on both surfaces, base cuneate or rounded-cuneate, apex truncate and deeply indented with 3-5 teeth |
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119 Salix oreophila |
| + |
Leaf blade obovate-oblong or long elliptic, 4-10 × 1-4 mm, base attenuate, margin distally with a few remote, glandular saw teeth, apex obtuse |
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116 Salix serpyllum |
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| 4 (2) |
Leaves abaxially slightly glaucous, sericeous, 3-5(-7) mm |
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115 Salix pilosomicrophylla |
| + |
Leaves abaxially greenish, glabrous, usually ca. 4 mm |
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117 Salix ovatomicrophylla |
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| 5 (1) |
Leaf margin entire or margin of some leaves with inconspicuous teeth (usually dentate in S. piptotricha and S. paraflabellaris). |
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(6) |
| + |
Leaf margin dentate. |
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(17) |
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| 6 (5) |
Leaves abaxially sericeous |
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115 Salix pilosomicrophylla |
| + |
Leaves abaxially sparsely pubescent or villous when young. |
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(7) |
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| 7 (6) |
Leaves greenish or slightly gray. |
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(8) |
| + |
Leaves abaxially pale or pruinose. |
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(14) |
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| 8 (7) |
Leaf blade linear or ovate-oblong. |
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(9) |
| + |
Leaf blade obovate, elliptic, or ovate. |
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(11) |
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| 9 (8) |
Leaves linear |
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122 Salix glareorum |
| + |
Leaves ovate-oblong. |
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(10) |
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| 10 (9) |
Leaf base attenuate |
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124 Salix gyirongensis |
| + |
Leaf base obtuse or rounded |
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123 Salix scopulicola |
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| 11 (8) |
Juvenile branchlets hispid |
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112 Salix kamanica |
| + |
Juvenile branchlets white villous. |
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(12) |
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| 12 (11) |
Juvenile branchlets densely pilose; leaf blade elliptic or ovate |
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120 Salix kangdingensis |
| + |
Juvenile branchlets sparsely pilose; leaf blade obovate, rarely elliptic. |
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(13) |
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| 13 (12) |
Leaves abaxially pale, villous |
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126 Salix piptotricha |
| + |
Leaves abaxially greenish, villous at first, later glabrescent |
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125 Salix ludingensis |
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| 14 (7) |
Leaf blade obovate-oblong, oblong, or obovate-lanceolate |
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121 Salix lindleyana |
| + |
Leaf blade elliptic, obovate-elliptic, or obovate. |
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(15) |
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| 15 (14) |
Trunk stout, with numerous branches and appearing fencelike |
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110 Salix clathrata |
| + |
Trunk relatively slender, few branched, not appearing fencelike. |
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(16) |
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| 16 (15) |
Leaf blade elliptic or ovate-elliptic, margin entire |
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114 Salix souliei |
| + |
Leaf blade obovate or obovate-elliptic, margin entire or glandular crenate |
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118 Salix paraflabellaris |
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| 17 (5) |
Leaf margin with teeth only at apex, entire proximally. |
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(18) |
| + |
Leaf margin entire or with numerous teeth distally and entire proximally. |
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(19) |
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| 18 (17) |
Leaf blade oblong or obovate, base cuneate, apex acute, shortly acuminate, or slightly obtuse, deeply indented with 3-5(-7) teeth |
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119 Salix oreophila |
| + |
Leaf blade obovate-oblong or long elliptic, base attenuate, apex obtuse, sometimes sparsely glandular serrate |
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116 Salix serpyllum |
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| 19 (17) |
Leaf margin dentate distally, entire or remotely dentate proximally. |
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(20) |
| + |
Leaf margin dentate. |
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(22) |
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| 20 (19) |
Juvenile branchlets yellowish brown hispidulous |
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111 Salix hirticaulis |
| + |
Juvenile branchlets not yellowish brown hispidulous. |
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(21) |
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| 21 (20) |
Juvenile branchlets coarsely hirsute; leaf blade obovate or elliptic, ca. 10 × 5 mm |
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112 Salix kamanica |
| + |
Juvenile branchlets sparsely villous or glabrous; leaf blade elliptic or obovate-elliptic, ca. 15 × 7 mm |
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108 Salix anticecrenata |
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| 22 (19) |
Leaves abaxially pale or pruinose |
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106 Salix calyculata |
| + |
Leaves abaxially greenish. |
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(23) |
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| 23 (22) |
Leaf blade spatulate-obovate or elliptic |
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113 Salix flabellaris |
| + |
Leaf blade elliptic, obovate-elliptic, or ovate. |
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(24) |
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| 24 (23) |
Leaf blade ovate, ca. 8 × 3.5(-5) mm, base cuneate |
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109 Salix crenata |
| + |
Leaf blade elliptic, obovate-elliptic, or ovate, (5-)10(-20) × 4-6 mm, base broadly cuneate |
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107 Salix brachista |
