468 WILSON EXPEDITION TO CHINA 



Sorhus 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 cm. 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, illinc 

 subacuta, media 1.5-2.7 cm. 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 nunc dense striata, subtus reticulato-striata circa stomata 

 V. ubique papillosa. Inflorescentiae pro parte ramum longiorem, pro 

 parte ramulos laterales brevissimos v. vix 4 cm. longos terminantes, 

 4.5-7,5 cm. latae, 5.5-6.5 cm. 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 in 

 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). 



