468 WILSON EXPEDITION TO CHINA 
Sorbus hupehensis seems related to Sorbus Wattii Koehne from Manipur, a 
well-marked species until recently confused with S. foliolosa Spach. 
Sorbus Prattii Koehne, n. sp. 
Frutex 2-4-metralis; rami 3-4 mm. diam., sordide cinerei v. demum 
nigro-fusci, nitiduli; gemmae ignotae. Stipulae siccae, lanceolatae, 3 
mm. longae; folia cum petiolo 1-1.8 cm. longo 8-13 em. longa, (9-) 
10-12(-13)-juga; rhachis anguste alata, parce longe tenere lanata v. 
glabrata, interstitiis circiter 0.6-1 cm. longis; foliola inde a pari tertio 
v. quarto deorsum decrescentia, media aequalia, parum circiter 4 
superiorum sensim sursum decrescentia, basi hinc obtusissima, illine 
subacuta, media 1.5-2.7 em. longa, 0.5-1 cm. lata, obtusa ac plerum- 
que mucronata, basi v. tertia v. dimidia parte integra ceterum argute 
serrulata dentibus utrinsecus circiter 8-15, supra glabra, subtus 
cano-viridia, laxissime tenerrime albide, secus costam saepius dense 
rufo-lanata, nervis utrinsecus circiter 7-9 saepe obsoletis reticuloque 
tenerrimis subtus saturatius coloratis, papyracea; epidermis supra 
nunc laevis nune dense striata, subtus reticulato-striata cirea stomata 
v. ubique papillosa. Inflorescentiae pro parte ramum longiorem, pro 
parte ramulos laterales brevissimos v. vix 4 em. longos terminantes, 
4.5-7.5 em. latae, 5.5-6.5 em. longae, laxae pauciflorae, planae v. Vix 
convexae, parce v. parcissime tenerrime albido- v. subrufo-lanata; 
flores mense Junio aperti; cupula glabra, sepala intus villosa; petala 
5 mm. longa, late breviter cuneato-unguiculata, ovata, medio supra 
parce tenere lanato-barbata, staminibus duplo longiora; carpidia 4 v. 5, 
tota connata, apice glabra; styli basi v. tertia parte connati, basi 
pubescentes. Fructus ignotus. 
Forsan formae duae distinguendae: 
Sorbus Prattii, f. striata Koehne, n. f. ` 
Rhachis inferne parce lanata v. glabra; foliola subtus etiam 1n 
costa laxe albide lanata; epidermis supra striata, subtus ubique 
manifeste papillosa. 
Western Szech’uan: Tachien-lu, alt. 3000-4500 m., A. Pratt 
(No. 234). 
Sorbus Prattii, f. laevis Koehne, n. f. 
Rhachis magis lanata; foliola subtus in costa dense rufo-lanata; 
epidermis supra laevis, subtus nonnisi circa stomata multa papillosa. 
Western Szech'uan: west of Tachien-lu, thickets, alt. 3300 m» 
June 1908 (No. 3006). 
