Keys in flora of Bhutan ;
l. Shoots puberulous; leaves narrowly elliptic-lanceolate, 5 — 9 x 1 - 2cm, pinnately veined to base ........ 1. S. hookeriana
+ Shoots glabrous; leaves ovate-lanceolate, 8— 12 x 2.5-4cm, 3-veined at base …….. 2. S. wallichii
Flora of Bhutan lists only these two species.
Details ain Flora of Bhutan are as below:
1. S. hookeriana Baillon; S.pruniformis Lindley var. hookeriana (Baillon) Hook. f. Tongsa: Hue Shing; Nep: Chilekath (34). Fig. l6r — v. Shrub 0.3 —2m; shoots puberulous. Leaves narrowly elliptic-lanceolate, 5 —9 x l - 2cm, acuminate or acute, base cuneate, pinnately veined but veins obscure, glabrous except on midrib above; petioles 5 — 7mm. Flowers strongly fragrant; racemes short, 3 — 10-flowered; bracts ovate c 2.5cm. Perianth segments greenish or pink, c 2mm. Stamens white, long-exserted, c 6mm. Ovary ovoid, c 2.5mm. Berries subglobose, c 8mm, black. Bhutan: S-Chukka district, C—Ha, Thimphu, Punakha,Tongsaand Bumthang districts, N - Upper Mo Chu district; Darjeeling; Sikkim; Arunachal Pradesh: Nyam Jang Chu. Shaded streamsides and ravines in cool broad-leaved and Blue Pine forests, 2130 — 2900m. April —June. Woodhard, sometimes used to make walking sticks (34). Valued horticulturally as a ground-cover plant and for its fragrant flowers.
2. S. wallichii Stapf; S. pruniformis sensu F.B.l. p.p. non Lindley Similar to S. hookeriana but shoots glabrous; leaves ovate-lanceolate, 8 — 12 x 2.5—4cm, long-acuminate, strongly 3-veined above base; petioles l — l.5cm; fruits c lcm diameter. Bhutan: S—Samchi district (Sangura, l 14),C-Tongsadistrict (Chendebi) and Mongar district (Mongar); Darjeeling: Batasi, Rimbik; Sikkim: Singalela; Arunachal Pradesh: NyamJangChu. Warm and cool broad-leaved forests, 1500 - 2300m. November— April.