| 1 |
Petiole less than 5 mm; leaf margin entire. |
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(2) |
| + |
Petiole more than 5 mm; leaf margin dentate or entire. |
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(14) |
| |
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|
|
| 2 (1) |
Leaf abaxially glabrous. |
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(3) |
| + |
Leaf abaxially pilose (including hairs present on leaves of young branchlets). |
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(7) |
| |
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|
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| 3 (2) |
Leaf blade lanceolate or oblong-lanceolate |
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77 Salix macroblasta |
| + |
Leaf blade neither lanceolate nor oblong-lanceolate. |
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(4) |
| |
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|
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| 4 (3) |
Branchlets yellow or yellowish brown; leaves subsessile |
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68 Salix dissa |
| + |
Branchlets neither yellow nor yellowish brown; petiole 2-5 mm. |
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(5) |
| |
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|
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| 5 (4) |
Petiole pubescent; leaf abaxially pruinose, very smooth |
|
94 Salix austrotibetica |
| + |
Petiole glabrous; leaf abaxially neither pruinose nor smooth. |
|
(6) |
| |
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|
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| 6 (5) |
Leaf blade ovate to elliptic, abaxially glaucous |
|
88 Salix denticulata |
| + |
Leaf blade elliptic or elliptic-oblong, abaxially green |
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84 Salix tangii |
| |
|
|
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| 7 (2) |
Leaf blade obovate-elliptic or obovate-oblong |
|
89 Salix parvidenticulata |
| + |
Leaf blade neither obovate-elliptic nor obovate-oblong. |
|
(8) |
| |
|
|
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| 8 (7) |
Leaves tufted villous abaxially only near base |
|
87 Salix maerkangensis |
| + |
Leaves not tufted villous. |
|
(9) |
| |
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|
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| 9 (8) |
Branches dull brown or dark grayish brown; stipules small or absent. |
|
(10) |
| + |
Branches usually purplish brown; stipules oblique or broadly ovate. |
|
(11) |
| |
|
|
|
| 10 (9) |
Leaf downy abaxially; petiole ca. 2.5 mm |
|
76 Salix pseudotangii |
| + |
Leaf pilose along midvein abaxially; petiole 2-4 mm |
|
85 Salix xizangensis |
| |
|
|
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| 11 (9) |
Petiole 3-5 mm, sericeous |
|
81 Salix mictotricha |
| + |
Petiole 1-3(-4) mm, downy or tomentose. |
|
(12) |
| |
|
|
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| 12 (11) |
Leaf glaucous abaxially |
|
83 Salix polyclona |
| + |
Leaf not glaucous abaxially. |
|
(13) |
| |
|
|
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| 13 (12) |
Leaf densely pubescent abaxially |
|
69 Salix heishuiensis |
| + |
Leaf subglabrous abaxially except along veins which are pubescent |
|
80 Salix luctuosa |
| |
|
|
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| 14 (1) |
Leaf margin dentate or inconspicuously dentate. |
|
(15) |
| + |
Leaf margin entire. |
|
(25) |
| |
|
|
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| 15 (14) |
Leaf margin remotely dentate or subentire when young. |
|
(16) |
| + |
Leaf margin inconspicuously dentate or margins of some leaves entire. |
|
(17) |
| |
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|
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| 16 (15) |
Leaf blade elliptic or ovate, rarely obovate glabrous on both surfaces, base rounded or broadly cuneate, apex obtuse; petiole 5-12 mm |
|
78 Salix wangiana |
| + |
Leaf blade lanceolate or oblong-lanceolate pilose on both surfaces, base cuneate, apex acute; petiole 3-6 mm |
|
65 Salix pseudowolohoensis |
| |
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|
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| 17 (15) |
Young leaves near apex of branchlets pilose abaxially; veins with yellowish brown hairs; branchlets tomentulose |
|
67 Salix praticola |
| + |
Young leaves near apex of branchlets usually glabrous abaxially; veins without yellowish brown hairs; branchlets glabrous or subglabrous. |
|
(18) |
| |
|
|
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| 18 (17) |
Young branchlets glabrous. |
|
(19) |
| + |
Young branchlets pilose. |
|
(21) |
| |
|
|
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| 19 (18) |
Leaf blade generally less than 3 cm (except on shoots and robust branchlets) abaxially not pruinose |
|
64 Salix tenella |
| + |
Leaf blade generally more than 3 cm, usually pruinose abaxially. |
|
(20) |
| |
|
|
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| 20 (19) |
Branchlets thick, usually pruinose; leaf blade elliptic or broadly elliptic, 3-5.5 cm |
|
71 Salix zangica |
| + |
Branchlets thin, not pruinose; leaf blade oblong or elliptic, to 3.5 cm |
|
70 Salix zhegushanica |
| |
|
|
|
| 21 (18) |
Petiole with 1-3 glands apically |
|
93 Salix minjiangensis |
| + |
Petiole eglandular. |
|
(22) |
| |
|
|
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| 22 (21) |
Petiole reddish; branchlets reddish or reddish black, shiny |
|
90 Salix ochetophylla |
| + |
Petiole not reddish; branchlets dull brown or purplish brown to blackish purple, not shiny. |
|
(23) |
| |
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|
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| 23 (22) |
Leaf blade usually greenish abaxially, sometimes whitish but not pruinose, elliptic to lanceolate, broadest below middle |
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63 Salix guebriantiana |
| + |
Leaf blade grayish white and pruinose abaxially, elliptic or obovate-elliptic. |
|
(24) |
| |
|
|
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| 24 (23) |
Leaf blade oblong-lanceolate |
|
66 Salix daguanensis |
| + |
Leaf blade not oblong-lanceolate |
|
74 Salix oreinoma |
| |
|
|
|
| 25 (14) |
Branchlets glabrous |
|
75 Salix hypoleuca |
| + |
Branchlets pilose. |
|
(26) |
| |
|
|
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| 26 (25) |
Leaf blade lanceolate to elliptic-lanceolate or long elliptic, obtuse or acute at both ends. |
|
(27) |
| + |
Leaf blade orbicular, elliptic, elliptic-oblong, or oblong, rarely obovate-elliptic, base usually rounded or broadly cuneate, rarely obtuse, apex acute or shortly acuminate. |
|
(28) |
| |
|
|
|
| 27 (26) |
Branchlets blackish, angled; leaves lanceolate or elliptic-lanceolate, 4-6 cm × 7-10 mm |
|
72 Salix longiflora |
| + |
Branchlets brown or grayish brown; leaves elliptic-lanceolate or long elliptic, 1.5-5.2 cm × 6-15 mm |
|
86 Salix cathayana |
| |
|
|
|
| 28 (26) |
Leaf blade orbicular. |
|
(29) |
| + |
Leaf blade not orbicular. |
|
(30) |
| |
|
|
|
| 29 (28) |
Petiole with 1-3 glands apically |
|
93 Salix minjiangensis |
| + |
Petiole eglandular apically |
|
91 Salix zhouquensis |
| |
|
|
|
| 30 (28) |
One-year-old branchlets densely dirty downy or tomentose |
|
92 Salix etosia |
| + |
One-year-old branchlets pilose or pilose when young, neither dirty downy nor tomentose. |
|
(31) |
| |
|
|
|
| 31 (30) |
Leaf apex rounded or slightly acute, rarely retuse |
|
73 Salix paratetradenia |
| + |
Leaf apex acute, shortly acuminate, or obtuse. |
|
(32) |
| |
|
|
|
| 32 (31) |
One-year-old branchlets ± villous; leaf blade elliptic to oblong, base rounded, apex acute or obtuse |
|
82 Salix rhoophila |
| + |
One-year-old branchlets glabrous (except for some young branchlets); leaf blade oblong-elliptic to broadly elliptic, base cuneate to rounded, apex acute to shortly acuminate |
|
79 Salix delavayana |
