| 1 |
Basal leaves caducous, mostly absent by anthesis. |
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(2) |
| + |
Basal leaves persistent, mostly present at anthesis. |
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(7) |
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| 2 (1) |
Cauline leaves mostly distributed in proximal 2/3-3/4 of stem. |
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(3) |
| + |
Cauline leaves distributed along stem as far as inflorescence. |
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(4) |
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| 3 (2) |
Sepals reflexed at anthesis; leaves usually glabrous adaxially |
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54 S. brachyphylla |
| + |
Sepals erect at anthesis; leaves pubescent adaxially |
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55 S. peplidifolia |
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| 4 (2) |
Cyme congested, 1.5-2 cm. |
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(5) |
| + |
Cyme lax, more than 5 cm, or flower solitary. |
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(6) |
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| 5 (4) |
Leaves sessile, lanceolate to narrowly ovate, base of median ones cordate |
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52 S. auriculata |
| + |
Leaves sessile to subsessile, ovate, base rounded |
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53 S. bulleyana |
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| 6 (4) |
Pedicels glandular pilose |
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56 S. hypericoides |
| + |
Pedicels glandular pilose, intermixed with a few brown, crisped, villous hairs |
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57 S. yezhiensis |
| |
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| 7 (1) |
Basal leaves glabrous adaxially. |
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(8) |
| + |
Basal leaves variously pilose adaxially. |
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(20) |
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| 8 (7) |
Pedicels glandular pilose, intermixed with brown, crisped, villous hairs |
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74 S. gonggashanensis |
| + |
Pedicels glandular pilose. |
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(9) |
| |
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| 9 (8) |
Cyme 2- or more flowered. |
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(10) |
| + |
Flower solitary. |
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(13) |
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| 10 (9) |
Cyme racemiform, 2-14-flowered, flowers secund |
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64 S. nigroglandulifera |
| + |
Cyme 2- or 3-flowered, flowers erect. |
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(11) |
| |
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| 11 (10) |
Margin of sepals glabrous |
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83 S. nakaoides |
| + |
Margin of sepals glandular ciliate. |
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(12) |
| |
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| 12 (11) |
Sepals glabrous abaxially |
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84 S. heteroclada var. aurantia |
| + |
Sepals glandular pilose abaxially |
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85 S. heterocladoides |
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| 13 (9) |
Flowering stem apparently leafless (cauline leaves, if present, immersed in basal foliage). |
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(14) |
| + |
Flowering stem leafy. |
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(15) |
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| 14 (13) |
Petals 2-callose |
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65 S. diapensia |
| + |
Petals not callose |
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66 S. caveana |
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| 15 (13) |
Apex of basal leaves aristulate |
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79 S. aristulata |
| + |
Apex of basal leaves obtuse to acute. |
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(16) |
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| 16 (15) |
Petals at least 5.5 mm. |
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(17) |
| + |
Petals to 4 mm. |
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(18) |
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| 17 (16) |
Sepals glabrous abaxially |
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S. heteroclada |
| + |
Sepals glandular pilose abaxially |
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85 S. heterocladoides |
| |
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|
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| 18 (16) |
Petals obovate, 2-2.8 mm wide |
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80 S. lepidostolonosa |
| + |
Petals elliptic to obovate, to 2 mm wide. |
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(19) |
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| 19 (18) |
Petals yellow; pedicels glandular pilose |
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82 S. subspathulata |
| + |
Petals orange; pedicels usually glabrous, rarely sparsely glandular pilose |
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81 S. sublinearifolia |
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| 20 (7) |
Basal leaves with long (ca. 0.75 mm), slightly wavy, eglandular hairs adaxially and marginally. |
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(21) |
| + |
Basal leaves shortly glandular pubescent or eglandular hispid adaxially. |
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(28) |
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| 21 (20) |
Sepals glabrous abaxially. |
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(22) |
| + |
Sepals glandular pilose abaxially. |
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(24) |
| |
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| 22 (21) |
Petals more than 1 cm |
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73 S. cordigera |
| + |
Petals to 0.75 cm. |
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(23) |
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| 23 (22) |
Pedicels glabrous, very rarely with a very few glandular hairs |
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72 S. forrestii |
| + |
Pedicels glandular pilose |
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70 S. chumbiensis |
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| 24 (21) |
Inflorescence corymbiform, 3-16-flowered |
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71 S. diffusicallosa |
| + |
Inflorescence 2- or 3-flowered or flower solitary. |
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(25) |
| |
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| 25 (24) |
Apex of basal and cauline leaves aristate |
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75 S. rizhaoshanensis |
| + |
Apex of basal and cauline leaves obtuse to acute. |
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(26) |
| |
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| 26 (25) |
Petals abaxially with a few glandular hairs proximally, base truncate, neither tapered nor contracted into a claw |
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69 S. subtsangchanensis |
| + |
Petals glabrous, base tapered or contracted into a claw. |
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(27) |
| |
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| 27 (26) |
Petals elliptic to obovate, 5-8 × 2.5-3.7 mm |
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68 S. tsangchanensis |
| + |
Petals broadly elliptic to broadly obovate, 0.7-1.3 cm × 5-9 mm |
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67 S. nigroglandulosa |
| |
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| 28 (20) |
Petals ovate or elliptic to obovate, to 2 × as long as wide. |
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(29) |
| + |
Petals oblong to narrowly obovate, ca. 3 × as long as wide. |
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(32) |
| |
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| 29 (28) |
Basal leaves eglandular hispid adaxially. |
|
(30) |
| + |
Basal leaves shortly glandular pubescent adaxially. |
|
(31) |
| |
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|
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| 30 (29) |
Pedicels and sepals glandular pilose; cauline leaves lanceolate to oblong, ca. 1 mm wide |
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77 S. peraristulata |
| + |
Pedicels and sepals glabrous; cauline leaves oblanceolate to ovate, 2-3 mm wide |
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76 S. glabricaulis |
| |
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|
|
| 31 (29) |
Basal leaf blade ca. 1.5 mm wide; petals to 5 mm; pedicels 2-2.5 mm |
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78 S. linearifolia |
| + |
Basal leaf blade ca. 2.5 mm wide; petals at least 6 mm; pedicels 3-14 mm |
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59 S. litangensis |
| |
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|
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| 32 (28) |
Basal leaves spatulate, without a ± well-defined petiole; inflorescence 2- or 3-flowered or flower solitary. |
|
(33) |
| + |
Basal leaves petiolate; inflorescence 2-14-flowered or flower solitary. |
|
(34) |
| |
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|
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| 33 (32) |
Petals oblong, to 9 × 2.7 mm |
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62 S. lychnitis |
| + |
Petals obovate, at least 10 × 4 mm |
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63 S. oresbia |
| |
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|
|
| 34 (32) |
Apex of leaves aristate |
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60 S. cacuminum |
| + |
Apex of leaves subobtuse. |
|
(35) |
| |
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|
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| 35 (34) |
Basal leaf blade at least 1.5 cm; leaves subglabrous; flowers secund |
|
64 S. nigroglandulifera |
| + |
Basal leaf blade less than 1.5 cm; leaves glandular pubescent; flowers erect. |
|
(36) |
| |
|
|
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| 36 (35) |
Petals glabrous |
|
58 S. pseudohirculus |
| + |
Petals glandular pilose abaxially and marginally |
|
61 S. yarlungzangboensis |
