ROSACEAE. — SOEBUS 463 



multo minora, cetera aequalia v. suprema 2 paullo minora, basi hinc 

 rotundata v. subcordata illinc paullo supra basin contracta, oblonga 

 V. late elliptica, majora 5-9.5 cm. longa, 2-3.5 cm. lata, brevissime 

 acutissime cuspidata, basi v. quarta parte Integra, ceterum inaequali- 

 ter hinc indc subduplicato-crenulata v. crenato-serrulata, dentibus 

 utrinsecus circiter 30-50 glandula triangular! adusta decidua termina- 

 tis, supra nitidula glabra v. pilis longis rufis teneris conspersa, subtus 

 pallidius viridia secus costam parce v. dense, interdum etiam secus 

 nervos rufo-lanata ceterum glabra v. parce rufo-pilosa, nervis utrin- 

 secus circiter 15-20 subtus vix prominulis, reticulo tenero subtus 

 saturatius colorato, papyracea; epidermis supra laevis subtus epapil- 

 losa striis paucis tenerrimis obsita. Inflorescentia ramum verisi- 

 militer longiorem terminans, 8-14 cm. lata, 7-10 cm. longa, plana v. 

 convexa e glomerulis densifloris composita, basi subglabra apice laxe 

 V. inde a basi dense rufo-lanata; flores fine mensis Junii aperti; cupula 

 glabra, sepala rufo-ciliata; petala circiter 4 mm. longa, e basi late 

 cuneata rotundato-ovata, glabra, alba, staminibus duplo longiora; 

 carpidia 5, tota connata, apice glabra, sed styli ima basi villosiuscula. 

 Fructus ignotus. 



Duae forsan formae distinguendae: 



Sorbus Helenae, f. subglabra Koehne, n. f. 



Rhachis glabra; foliola longiora angustiora longitudine latitudinem 

 triplam v. fere quadruplam aequante, supra glabra, subtus juxta 

 costam nervosque brevius minusque dense rufo-lanata ceterum glabra. 

 Inflorescentiae inferne glabrae, superne laxiuscule rufo-lanatae. 



Western Szech'uan: summit of the Niu-tou-shan, west of Kuan 

 Hsien, alt. 3000 m., June 30, 1908 (No. 3009). 



Sorbus Helenae, f. rufidula Koehne, n. f. 



Rhachis subtus rufo-lanata; foliola breviora latiora longitudine 

 latitudinem duplam aequante vel paullo superante, utrinque pilis 

 conspersa subtusque in costa nervisque densissime rufo-lanata. In- 

 florescentiae inde a basi dense rufo-lanatae. 



Western Szech'uan: Mupin, woodlands, alt. 2600-3000 m., 

 June 1908 (No. 3010). 



Named for the daughter of the author. 



A remarkable and distinct species witli the thick branches and the large, not 

 numerous leaflets of all the preceding species from S. expansa to S. Sargentiana, but 

 in other characters very different from them. 



