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| 1 |
Dwarf shrubs, prostrate or procumbent, up to 15 cm tall (section Lindleyana). |
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(2) |
| + |
Erect shrubs or trees, more than 30 cm tall. |
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(3) |
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| 2 (1) |
Lamina elliptic, ovate or suborbicular or spathulate-obovate, margin glandular serrate or crenate. |
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18 S. flabellaris |
| + |
Lamina oblong-lanceolate, obovate-oblong, oblong, margins serrulate to crenulate. |
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19 S. lindleyana |
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| 3 (1) |
Lamina green, at least 5 times as long as wide, usually linear, lanceolate or oblong-lanceolate. |
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(4) |
| + |
Lamina rarely slightly grayish blue, less than 5 times as long as wide, often elliptic to suborbicular or oblong to obovate-oblong. |
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(17) |
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| 4 (3) |
Lamina more than 11 times as long as broad. |
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(5) |
| + |
Lamina not as above. |
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(6) |
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| 5 (4) |
Leaf 2-4 cm x 0.2-0.3 (0.5) cm. |
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3 S. wilhelmsiana |
| + |
Leaf (1.5)-4-8.5 cm x 3-10 mm. |
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7 S. blakii |
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| 6 (4) |
Lamina 6-7(-8) times as long as broad |
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(7) |
| + |
Lamina 5 times or less as long as broad. |
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(8) |
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| 7 (6) |
Branches with white bloom, lamina margin serrulate. |
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5 S. capusii |
| + |
Branches not as above, margin minutely acutely toothed. |
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4 S. koeieana |
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| 8 (6) |
Lamina silky tomentose or villous at least on one side. |
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(9) |
| + |
Lamina not as above. |
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(11) |
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| 9 (8) |
Lamina (linear-) lanceolate, obovate, villous. |
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24 S. schugnanica |
| + |
Lamina linear, lanceolate or oblong to ovate-oblong, not villous. |
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(10) |
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| 10 (9) |
Lamina linear, lanceolate, (5)-12-20 x 0.5-2-(4) cm, lateral veins 25-30 pairs. |
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20 S. viminalis |
| + |
Lamina broadly lanceolate, oblong to ovate-oblong, 4.5-14 x 1-2.5 cm, lateral veins 16-18-(20) pairs. |
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21 S. turanica |
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| 11 (8) |
Leaf green above, paler or lighter below. |
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(12) |
| + |
Leaf not as above. |
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(13) |
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| 12 (11) |
Stipules minute caducous; petiole 2.5-9 mm. |
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1 S. acmophylla |
| + |
Stipules conspicuous, semicordate with gland-tipped teeth; petiole 5-18 mm. |
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2 S. tetrasperma |
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| 13 (11) |
Branches pendulous. |
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(14) |
| + |
Branches not pendulous. |
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(15) |
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| 14 (13) |
Young branchlets tomentose; young leaves silvery sericeous, rarely subglabrescent. |
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12 S. alba |
| + |
Young branchlets glabrous. |
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13 S. babylonica |
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| 15 (13) |
Stipules, not caducous, glandular dentate. |
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8 S. sericocarpa |
| + |
Stipules caducous. |
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(16) |
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| 16 (15) |
Young branchlets tomentose; young leaves silvery sericeous, rarely subglabrous. |
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12 S. alba |
| + |
Young branchlets glabrous, shiny; leaves slightly pilose or appressed pubescent, glabrescent to subglabrous. |
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6 S. pycnostachya |
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| 17 (3) |
Stipules semicordate or reniform. |
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(18) |
| + |
Stipules not as above. |
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(22) |
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| 18 (17) |
Lamina about half as broad as long; margin sinuate-erose. |
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22 S. aegyptiaca |
| + |
Lamina not as above. |
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(19) |
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| 19 (18) |
Lamina green glabrous above, pale beneath. |
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2 S. tetrasperma |
| + |
Lamina not as above. |
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(20) |
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| 20 (19) |
Petiole 3-5 mm; lamina pilose, becoming glabrous. |
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15 S. iliensis |
| + |
Petiole 5-10-16(-17) mm, lamina silky when young, persistently silky or nearly glabrous when mature or hairy above on the midrib, glabrous beneath. |
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(21) |
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| 21 (20) |
Young branches pubescent, one year old subglabrous to glabrous. Lamina serrate. |
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16 S. dolichostachya |
| + |
Branches silky tomentose. Lamina entire or serrulate. |
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17 S. wallichiana |
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| 22 (17) |
Lamina green above, pale beneath. |
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(23) |
| + |
Lamina not as above. |
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(25) |
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| 23 (22) |
Lamina linear lanceolate, acute-acuminate, 5-16 x (0.5)-0.7-2 cm. |
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1 S. acmophylla |
| + |
Lamina not as above. |
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(24) |
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| 24 (23) |
Twigs dark brown or purplish, lamina ovate, ovate-lanceolate to elliptic, base rotund to subcordate, tip briefly acuminate, generally oblique. |
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11 S. karelinii |
| + |
Twigs not purplish. Lamina elliptic, oblong or ovate, base not rotund to subcordate, tip obtuse to acute not oblique. |
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9 S. denticulata |
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| 25 (22) |
Lamina tip shortly acuminate, oblique. |
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(26) |
| + |
Lamina tip not as above. |
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(27) |
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| 26 (25) |
Lamina glabrous. |
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23 S. fedtschenkoi |
| + |
Lamina villous on both the sides. |
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26 S. nuristanica |
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| 27 (25) |
Young branches reddish brown, reddish black or purplish red. |
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(28) |
| + |
Young branches not as above. |
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(29) |
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| 28 (27) |
Leaf oblong, elliptic or lanceolate, 0.5-3 x 0.3-1 cm. |
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10 S. caesia |
| + |
Leaf elliptic, ovate or obovate to suborbicular, 2-3.4 x 1-2 cm. |
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25 S. sclerophylla |
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| 29 (27) |
Lamina broadly elliptic, narrowed towards the base, tip shortly acuminate. |
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14 S. excelsa |
| + |
Lamina not as above. |
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(30) |
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| 30 (29) |
Stipules absent; lamina silky tomentose on both the sides or glabrescent above. |
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24 S. schugnanica |
| + |
Stipules present; lamina silky beneath becoming glabrous on both sides or glabrous except on the midrib above, pubescent below. |
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(31) |
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| 31 (30) |
Stipules persistent. |
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8 S. sericocarpa |
| + |
Stipules not persistent. |
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6 S. pycnostachya |
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