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 cm. longo 

 11.5-18 cm. longa, (7-)10-ll-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 irrcgulariter striata. Fructus ad 11 mm. (?) diam., 

 albus. Cetera ut in typo. 



Western Szech'uan: west and near Wen-ch'uan Hsien, wood- 

 lands, alt. 2600-3000 m., September 1908 (No. 1035, fruiting branches 

 only; the flowering branches belong to S. viultijuga Koehne). 



Sorbus aperta Koehne, n. sp. 



Arbor 8-13-metralis trunco 30-60 cm. diam.; rami ad 4 mm. diam., 

 cinerei; gemmae 1 cm. longae, summo apice tantum lanatae. Stipulae 

 caducae certe parvae; foHa cum petiolo 2-4.5 cm. 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. hinc obtusiuscula, elliptica v. oblongo- 

 elliptica, 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 palhde cano-viridia, costa ochracea, glabra, margine interdum 

 basi parce ciliolata, nervis utrinsecus circiter 10-16 rcticuloque supra 

 hand v. parum subtus manifeste prominulis pallidis, chartacea; 

 epidermis supra striis brevibus ramosis striata, subtus sul^papilloso- 

 reticulata papillis circa stomata prominulis apice scabris ceterum 

 vix distinctis, cellularum limitibus absconditis. Inflorescentia sup- 

 petens ramulum latcralem abbreviatum 1 cm. longum terminans, 

 12 cm. lata, 8 cm. 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- 



