ROSACEAE. — SORBUS 463 
multo minora, cetera aequalia v. suprema 2 paullo minora, basi hinc 
rotundata v. subcordata illine paullo supra basin contracta, oblonga 
v. late elliptica, majora 5-9.5 cm. longa, 2-3.5 em. lata, brevissime 
acutissime cuspidata, basi v. quarta parte integra, ceterum inaequali- 
ter hine inde subduplicato-crenulata v. crenato-serrulata, dentibus 
utrinsecus circiter 30-50 glandula triangulari 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 with the thick branches and the large, not 
numerous leaflets of all the preceding species from S. expansa to S. Sargentiana, but 
1n other characters very different from them. 
