1	"Plants sterile"	2
1	"Plant material with flowers"	33
2	"Plants dwarf shrubs up to 15 cm tall, prostrate or procumbent"	3
2	"Plants erect shrubs or trees, more than 30 cm tall"	4
3	"Blades elliptic, ovate, suborbicular, or spathulate-obovate; margins glandular serrate or crenate"	"Salix flabellaris"
3	"Blades oblong-lanceolate, obovate-oblong, or oblong; margins werrulate to crenulate"	"Salix lindleyana"
4	"Blades at least 5 times as long as wide, usually linear, lanceolate, or oblong-lanceolate, green"	5
4	"Blades less than 5 times as long as wide, often elliptic to suborbicular or oblong to obovate-oblong, rarely slightly greyish blue"	18
5	"Blades more than 11 times as long as wide"	6
5	"Blades less than 11 times as long as wide"	7
6	"Leaves 2-4 cm long and 0.2-0.3(0.5) cm wide"	"Salix wilhelmsiana"
6	"Leaves (1.5)4--.5 cm long and 0.3-1 cm wide"	"Salix blakii"
7	"Blades 6-7(-8) times as long as wide"	8
7	"Blades up to 5 times as long as wide"	9
8	"Branches with a white bloom; blade margins serrulate"	"Salix capusii"
8	"Branches not as above; blade margins minutely acutely toothed"	"Salix koeieana"
9	"Blades silky-tomentose or villous at least on one side"	10
9	"Blades not as above"	12
10	"Blades (linear-) lanceolate, obovate, villous"	"Salix schugnanica"
10	"Blades linear, lanceolate or oblong to ovate-oblong, not villous"	11
11	"Blades linear, lanceolate, (5-)12-20 cm long, 0.5-2(-4) cm wide, lateral veins 25-30 pairs"	"Salix viminalis"
11	"Blades broadly lanceolate, oblong to ovate-oblong, 4.5-14 cm long, 1-2.5 cm wide, lateral veins 16-18 (-20) pairs"	"Salix turanica"
12	"Leaves green on the upper surface, paler or lighter below"	13
12	"Leaves not as above"	14
13	"Stipules minute, caducous; petioles 2.5-9 mm"	"Salix acmophylla"
13	"Stipules conspicuous, semicordate with gland-tipped teeth; petioles 5-18 mm long"	"Salix tetrasperma"
14	"Branches pendulous"	15
14	"Branches not pendulous"	16
15	"Young branchlets tomentose; young leaves silvery sericeous, rarely subglabrescent"	"Salix alba"
15	"Young branchlets glabrous"	"Salix babylonica"
16	"Stipules not caduous, glandular dentate"	"Salix sericocarpa"
16	"Stipules caducous"	17
17	"Young branchlets tomentose; young leaves silvery sericeous, rarely subglabrescent"	"Salix alba"
17	"Young branchlets glabrous, shiny; leaves slightly pilose or appressed pubescent, glabrescent to subglabrous"	"Salix pycnostachya"
18	"Stipules semicordate or reniform"	19
18	"Stipules not as above"	23
19	"Blades about half as wide as long"	"Salix aegyptiaca"
19	"Blades not as above"	20
20	"Blades green and glabrous on the upper surface, pale beneath"	"Salix tetrasperma"
20	"Blades not as above"	21
21	"Petioles 3-5 mm long; blades pilose, becoming glabrous"	"Salix iliensis"
21	"Petioles (5-)10-16(-117) mm long; blades silky when young, persistently silky or nearly glabrous when mature or hairy above on the midrib, glabous on the lower surface"	22
22	"Young branches pubescent, one year old branches subglabrous to glabrous; blades serrate"	"Salix dolichostachya"
22	"Branches silky tomentose; blades entire or serrulate"	"Salix wallichiana"
23	"Blades green above, pale beneath"	24
23	"Blades not as above"	32
24	"Blades linear lanceolate, acute to acuminate, 5-16 cm long by (0.5-)0.7-2 cm wide"	"Salix acmophylla"
24	"Blades not as above"	25
25	"leaf tips shortly acuminate, oblique"	26
25	"leaf tips not as above"	27
26	"Blades glabrous"	"Salix fedtshenkoi"
26	"Blades villous on both sdes"	"Salix nuristanica"
27	"Young branches reddish brown, reddish black, or purplish red"	28
27	"Young branches not as above"	29
28	"Blades oblong, elliptic, or lanceolae, 0.5-3 cm long, 0.3-1 cm wide"	"Salix caesia"
28	"Blades elliptic, ovate or obovate to suborbiculate, 2-3.4 cm long, 1-2 cm wide"	"Salix sclerophylla"
29	"Blades broadly elliptic, narrowed towards the base, tip shortly acuminate"	"Salix excelsa"
29	"Blades not as above"	30
30	"Stipules absent; blades silky tomentose on both the sides or glabrescent above"	"Salix schugnanica"
30	"Stipules present; blades silky on the lower surface becoming glabrous on both sides or glabrous except on the midrib above and pubescent below"	31
31	"Stipules persistent"	"Salix sericocarpa"
31	"Stipules not persistent"	"Salix pycnostachya"
32	"Twigs dark brown or purplish; blades ovate, ovate-lanceolate to elliptic, base round to subcordate, tip shortly acuminate, usualy oblique"	"Salix karelinii"
32	"Twigs not purplish; blades elliptic, oblong, or ovate, base not round to subcordate, tip obtuse to acute, not oblique"	"Salix denticulata"
33	"Staminate flowers present"	34
33	"Pistillate flowers present"	66
34	"Stamens 3 or more per flower"	35
34	"Stamens 2 per flower"	36
35	"Catkins 5-13 cm long, lax, flowers in whorls"	"Salix tetrasperma"
35	"Catkins 1.5-4 (-5) cm long, dense"	"Salix acmophylla"
36	"Plants dwarf shrubs, prostrate or procumbent, usually less than 30 cm tall"	37
36	"Plants erect shrubs or trees, more than 30 cm tall"	38
37	"Catkins lateral, terminal on short leafy shoots, slightly loosely flowered, 10-45 mm long; rachis hairy; blades elliptic, obovate, or suborbicular, 7-35 mm long, 5-24 mm long"	"Salix flabellaris"
37	"Catkins terminal, only few-flowered, 7.5-12.7 mm long; rachis glabrous; blades oblong, obovate lanceolate, 5-21 cm, by 5-8 mm"	"Salix lindleyana"
38	"Filaments glabrous"	39
38	"Filaments hairy at the base"	50
39	"Filaments partly or completely united"	40
39	"Filaments free"	42
40	"Petioles 1-2 mm; blades 2-3 mm wide"	"Salix wilhelmsiana"
40	"Petioles 2-10 mm; blades 7 mm or more wide"	41
41	"Twigs dark brown or purplish; upper and lower surfaces differently colored"	"Salix karelinii"
41	"Twigs not as above; blade surfaces not differently colored"	"Salix schugnanica"
42	"Twigs and leaves silvery or grey tomentose"	43
42	"Twigs glabrous or juvenile branchlets white, pilose; one year old branchlets glabrous; leaves not as above"	47
43	"Blades about half as wide as long, margins sinuate-erose; filaments more than 7 mm long"	"Salix aegyptiaca"
43	"Blades less than half as wide as long"	44
44	"Staminate catkins sessile or subsessile"	45
44	"Staminate catkins pedunculate"	46
45	"Blades 15-20 cm long, 0.5-2(-4) cm wide, lateral veins 25-30 pairs; male catkins 2.5-3 cm long 1-1.5 cm wide"	"Salix viminalis"
45	"Blades 4.5-14 cm long, 1-2.5 cm wide, lateral veins 16-18 (-20) pairs; male catkins 2.5-5 cm long, 1-1.5 cm wide"	"Salix turanica"
46	"Staminate catkins at anthesis about (1.5-)2.5-3 (-4) cm long and 1-1.5 cm wide"	"Salix wallichiana"
46	"Staminate catkins at anthesis 1.5-2.5 cm long ang 0.8-1(-1.2) cm wide"	"Salix schugnanica"
47	"Leaves without stipules; leaf tips obtuse, mucronate"	"Salix schugnanica"
47	"Leaves with stipules; leaf tips acute or acuminate"	48
48	"Leaf tips acute"	"Salix dolichostachya"
48	"Leaf tips obliquely acuminate"	49
49	"Twigs dark brown, purplish; upper and lower leaf surfaes different in color"	"Salix karelinii"
49	"Twigs not as above; blade surfaces similarly colored"	"Salix fedtshenkoi"
50	"Filaments free"	51
50	"Filaments partly or completely united"	60
51	"Leaf blades elliptic, oblong, or obovate, 2.5-6.5 cm long, 1.2-2.4 cm wide, tips obtuse to acute"	"Salix denticulata"
51	"Leaf blades not as above"	52
52	"Blades elliptic to subrhomboidal, bases narrowed, tips acuminate"	"Salix iliensis"
52	"Blades not as above"	53
53	"Blades less than 5 cm long"	"Salix sclerophylla"
53	"Blades 5 cm long or longer"	54
54	"Branches drooping"	55
54	"Branches erect"	56
55	"Staminate atkins up to 2.5 cm long"	"Salix babylonica"
55	"Staminate catkins 2.5-5 cm long"	"Salix alba"
56	"Leaves less than 3 cm wide"	57
56	"Leaves more than 3 cm wide"	59
57	"Stipules up to 1.3 cm long, semicordate, serrate"	"Salix dolichostachya"
57	"Stipules caduous, small, lanceolate or subulate"	58
58	"Staminate catkins 4-5 mm wide before emergence of anthers; bracts usually more than 1 mm wide; anthers (0.7-)0.8-0.9 mm long"	"Salix excelsa"
58	"Staminate catkins 3-4 mm wide before emergence; bracts usually less than 1 mm wide; anthers 0.5-0.6 -(0.7) mm long"	"Salix alba"
59	"Stipules minute, caducous; petioles 2.5-9 mm"	"Salix wallichiana"
59	"Stipules up to 1.3 cm long, semicordate, serrate"	"Salix dolichostachya"
60	"Branches mostly covered by white bloom"	"Salix capusii"
60	"Branches not covered by white bloom"	61
61	"Staminate catkins up to 2 cm long"	62
61	"Staminate catkins more than 2 cm long"	63
62	"Young branches reddish brown or reddish black; leaves oblong, elliptic, or lanceolate; staminate catkins sessile"	"Salix caesia"
62	"Young branches not as above; leaves narrowly lanceolate; staminate catkins pedunculate, peduncles 1-4 mm lgon"	"Salix koeieana"
63	"Blades oblong, elliptic, or obovate, 2.5-6.5 cm long, 1.2-2.4 cm wide, tips obtuse or acute"	"Salix denticulata"
63	"Blades not at above"	64
64	"Filaments partly united"	"Salix sericocarpa"
64	"Filaments completely united"	65
65	"Blades (2.3-)4-10 cm long. 0.5-2.5 cm wide"	"Salix pycnostachya"
65	"Blades (1.5-)4-8.5 cm long, o.3-1 cm wide"	"Salix blakii"
66	"Capsules glabrous"	67
66	"Capsules hairy"	81
67	"Plants dwarf shrubs of alpine areas; leaves usually less than 2.5 cm long"	68
67	"Plants small or large shrubs or trees"	69
68	"Catkin rachises hairy; pistillage catkins 10-45 mm long; leaf margins crenate or serrate"	"Salix flabellaris"
68	"Catin rachises glabrous; pistillate catkins 7.5-12.7 mm long; leaf margins entire"	"Salix lindleyana"
69	"Branches long drooping, tree with a ""weeping' habit"	70
69	"Branches erect or spreading, not drooping"	71
70	"Leaves near the catkins much smaller than those elsewhere; nectary 1, longer than the stipe"	"Salix babylonica"
70	"Leaves near the catkins more or less the same size as those elsewhere; nectaries 1-2 per flower, equaling the stipes (0.2-0.8 mm) in length"	"Salix alba"
71	"Bracts, ovaries, and capsules reddish violet"	"Salix karelinii"
71	"Bracts, ovaries and capsules not as above"	72
72	"Branches mostly covered by white bloom; ovary stipes about 1 mm long"	"Salix capusii"
72	"Branches not covered by a white bloom"	73
73	"Fruiting catkins about 1 cm long"	"Salix nuristanica"
73	"Fruiting catkins more than 1 cm long"	74
74	"Blades ovate or elliptic-oblong, their tips usually obtuse, sometimes acute; stigmas subsessile"	"Salix denticulata subsp. denticulata"
74	"Blades not as above"	75
75	"Leaves elliptic or oblong-obovate, their tips shortly acuminate, usually oblique"	"Salix fedtshenkoi"
75	"Leaves lanceolate to linear lanceolate, ovate lanceolate, elliptic, or broadly elliptic, their tips not oblique"	76
76	"Fruiting catkins 5 cm long or longer"	77
76	"Fruiting catkins usually shorter than 5 cm"	79
77	"Fruiting catkins 10-18 cm long; stipules up to 1.3 cm long"	"Salix dolichostachya"
77	"Fruiting catkins no more than 10 cm long; stipiles les than 1 cm long"	78
78	"Fruiting catkins lax; stipes 0.5-3 mm long; capsules 3.5-5 mm long"	"Salix tetrasperma"
78	"Fruiting catkins not lax; stipes 0.1-0.8 mm; capsules 4-6 mm long"	"Salix pycnostachya"
79	"Blades broadly elliptic, their tips shortly acuminate"	"Salix excelsa"
79	"Blades not as above"	80
80	"Stipes 0.1-0.8 mm long; capsules 4-6 mm long"	"Salix pycnostachya"
80	"Stipes 0.4-1.8 (-2.5) mm long; capsules 3-5.5 mm long"	"Salix acmophylla"
81	"Blades about half as wide as long, their margins sinuate-erose; capsules 7-9 mm long"	"Salix aegyptiaca"
81	"Blades not as above; capsules clearly shorter than 7 mm"	82
82	"Blades usually elliptic to sub-rhomboidal, rarely ovate, 2.5-6.5 cm long and 1.2-2.4 cm wide, their tupes obtuse or acute"	"Salix iliensis"
82	"Blades not as above"	83
83	"Blades elliptic, oblong or ovate, 2.5-6.5 cm long by 1.2 - 2.4 cm wide, their tips obtuse or acute"	"Salix denticulata subsp. hazarica"
83	"Blades not as above"	84
84	"Branches mostly covered by a white bloom"	"Salix capusii"
84	"Branches not covered by a white cllom"	85
85	"Leaves silky pubescent on the lower surface"	86
85	"Leaves not silky pubescent on the lower surface (but may be pubescent)"	89
86	"Fruiting catkins 5-8 cm long"	"Salix wallichiana"
86	"Fruiting catkins 1.5-5 m long"	87
87	"Leaves villous, usually  lanceolate or obovate, occasionally nearly linear; capsules 5-7 mm long"	"Salix schugnanica"
87	"Leaves not villous, linear to lanceolate, oblong or ovate bolong; capsules 4-6 mm long"	88
88	"Leaves linear to lanceolate, (5-)12-20 cm long, 0.5-2(-4) cm wide with 25-30 pairs of lateral veins"	"Salix viminalis"
88	"Leaves broadly lanceolate or oblong to oblong-ovate, 4.5-14 cm long and 1-2.5 cm wide with 16-18(-20) pairs of lateral veins"	"Salix turanica"
89	"Catkins up to 2 cm long"	90
89	"Catkins 3 cm long or longer"	93
90	"Blades up to 0.9 cm wide"	91
90	"Blades usually more than 1 cm wide"	92
91	"Branches pubescent or silky, rarely becoming glabrous with age; stipules absnt; leaf blades 2-4 mm wide, hairy on both surfaces"	"Salix wilhelmsiana"
91	"Branches glabrous; stipules present; blades 3-7(-9) mm wide, glabrous or younger blades scantily silky on the the lower surface"	"Salix koeieana"
92	"Blades oblong, elliptic, or lanceolate; styles entire or 2-lobed; nectaries 1 per flower"	"Salix caesia"
92	"Blades elliptic, ovate, or suborbicular; styles 4-lobed; nectaries 2 per flower"	"Salix sclerophylla"
93	"Blades up to 1 cm wide"	94
93	"Blades usually wider than 1 cm"	95
94	"Ovaries and capsules sessile; style tips entire or biloged"	"Salix wilhelmsiana"
94	"Ovaries and capsules stipitate; style tips 4-lobed, lobes upright"	"Salix blakii"
95	"Stipules minute or semicordate, coarsely toother; styles 2-4 branched, branches longer than the base; stipes 0.7-2 mm long; capsules 5-9 mm long"	"Salix wallichiana"
95	"Stipules linear, lanceolate; styles 2-4 branches, the branches longer than the baseal portion; stipes 0.1-10 mm long; capsules 4-6 mm long"	96
96	"Stipules persistent"	"Salix sericocarpa"
96	"Stipules not persistent"	"Salix pycnostachya"