ROSACEAE. — SORBUS 465 
Tachien-lu, thickets, alt. 3300-4000 m., July 7, 1908 (No. 3005); 
west of Tachien-lu, woods, alt. 3300 m., October 1908 (No. 1281). 
A very remarkable and distinct species, allied to the preceding with equally 
dark branches, though quite different in the leaflets and inflorescence. 
Sorbus Rehderiana, var. grosseserrata Koehne, n. var. 
Gemmae apice rufo-sericeae. Folia cum petiolo 1.2-2.5 em. longo 
11.5-18 em. longa, (7-)10-11-juga; foliola media 2.5-3.8 cm. longa, 
0.8-1.3 cm. lata, multo profundius serrata quam in typo, etiam sub- 
tus parce longe villosa, adulta chartacea; epidermis subtus pro parte 
laevis, pro parte irregulariter striata. Fructus ad 11 mm. (?) diam., 
albus. Cetera ut in typo. 
Western Szech’uan: west and near Wén-ch’uan Hsien, wood- 
lands, alt. 2600-3000 m., September 1908 (No. 1035, fruiting branches 
only; the flowering branches belong to S. multijuga Koehne). 
Sorbus aperta Koehne, n. sp. 
Arbor 8-13-metralis trunco 30-60 cm. diam.; rami ad 4 mm. diam., 
cinerei; gemmae 1 em. longae, summo apice tantum lanatae. Stipulae 
caducae certe parvae; folia cum petiolo 2-4.5 em. longo 10-18 cm. 
longa, (4-)5-juga; rhachis exalata, supra ad nodulos saepe pilis 
longissimis albidis conspersa ceterum glabra, interstitiis 1.3-2 cm. 
longis; foliola subaequalia v. inde a pari medio sursum deorsumque 
subdecrescentia, basi acuta v. hine obtusiuscula, elliptica v. oblongo- 
elliptiea, majora 3-5.5 cm. longa 1.2-1.7 cm. lata, acuta v. breviter 
cuspidata, tertia circiter parte integra superne angustissime serrata 
dentibus utrinsecus circiter 7-15 patulis, supra (autumno) glabra 
subtus pallide cano-viridia, costa ochracea, glabra, margine interdum 
basi parce ciliolata, nervis utrinsecus circiter 10-16 reticuloque supra 
ud v. parum subtus manifeste prominulis pallidis, chartacea; 
epidermis supra striis brevibus ramosis striata, subtus subpapilloso- 
reticulata papillis circa stomata prominulis apice scabris ceterum 
vix distinctis, cellularum limitibus absconditis. Inflorescentia sup- 
petens ramulum lateralem abbreviatum 1 cm. longum terminans, 
12 em, lata, 8 em. longa, subconvexa, laxissima pauciflora, glaberrima; 
Sepala glabra; petala staminaque ignota; carpidia 5, fere tota con- 
nata, summo apice tantum segregata lanata. Fructus globosus circiter 
6 mm. diam., albus, sepalis omnino inflexis. 
Western Szech'uan: Min Valley, Mao-chou, alt. 2500 m., Octo- 
