482 WILSON EXPEDITION TO CHINA 
red fruits. On the other hand they resemble the species of the 5th group, for the 
leaflets are comparatively small and numerous, the rhachis shows a tendency 
toward the formation of wings and the carpels are, at least in SS. scalaris, united 
farther toward the apex. 
Sorbus arachnoidea Koehne from Sikkim and the adjacent Thibetian district 
Chumbi is perhaps best referred to this group. 
3. Group. 
12. Sorbus Helenae Koehne. See p. 462. 
Sorbus Helenae, f. subglabra Koehne. See p. 463. 
Sorbus Helenae, f. rufidula Koehne. See p. 463. 
18. Sorbus tapashana Schneider in Bull. Herb. Boissier, sér. 2, VI. 313 (1906) 
* an var. Sorbi pohuashanensis (Hance) Rehder? "; Ill. Handb. Laubholzk. 1.672, 
fig. 369 b (1906). UE 
Northern Shensi: Summit of Tai-pei-shan, September 10-20, 1897, G. Giraldi 
(No. 5126), August 1899, G. Giraldi (No. 5127); first zone and at the foot of Tai- 
pei-shan, August 1894, G. Giraldi (No. 1082). 
14. Sorbus Rehderiana Koehne. See p. 464. 
Sorbus Rehderiana, var. grosseserrata Koehne. See p. 465. 
4. Group, 
15. Sorbus aperta Koehne. See p. 465. 
16. Sorbus laxiflora Koehne. See p. 466. 
17. Sorbus hupehensis Schneider. See p. 467. 
Sorbus hupehensis, var. syncarpa Koehne. See p. 467. 
Here may probably best be added: Sorbus foliolosa (Wallich) Spach from 
Nepal and Sikkim, S. Wattii Koehne from Manipur and possibly also S. Kurzii 
(Watt apud Prain) Schneider from Sikkim. 
5. GROUP. 
18. Sorbus Prattii Koehne. See p. 468. 
Sorbus Prattii, f. laevis Koehne. See p. 468. 
Sorbus Prattii, f. striata Koehne. See p. 468. 
Probably most closely allied to this species are S. cashmiriana Hedlund from 
the Himalaya from Kashmir to Simla, S. ursina (Wallich) Decaisne from Kamaon, 
S. Wenzigiana (Schneider) Koehne from Kamaon and Sikkim. 
19. Sorbus munda Koehne. See p. 469. 
Sorbus munda, f. tatsienensis Koehne. See p. 469. 
Sorbus munda, f. subarachnoidea Koehne. See p. 469. 
1 In this group belong probably Sorbus sambucifolia (Chamisso et Schlechten- 
dal) Roemer from Kamtchatka and Saghalin, S. Schneideriana Koehne A 
Amurland, S. Wilfordii Koehne from Tsushima, S. pseudogracilis (Schneider 
Koehne from Japan, S. Matsumurana (Makino) Koehne from Japan, S. polars 
Koehne from the mouth of the river Ob, and S. thianshanica Ruprecht from Turke- 
Stan, Afghanistan and Kashmir. 
