52 WILSON EXPEDITION TO CHINA 



A ver>' graceful species well distinguished by its long narrow catkins and leaves. 

 In the silvery pubescence of the leaves it resembles S. psilostigma Andersson and 

 S. viminalis Linnaeus. By its catkins it seems most nearly related to S. phanera 

 Schneider. In *S. psilostigma Andersson the catkins are considerably shorter, 

 otherwise, so far as I can judge from the material before me, the Hupeh form of 

 this species comes very near my new S. phaidima, which has longer petioles and 

 quite entire leaves. 



The specific name is derived from cf)ai8ifios, illustrious. 



Salix dissa Schneider, n. sp. 



Frutex ramosus, 0.6-1.5 (-2.4) m. altus, erectus; ramuli hornotini 

 plus minusve dense breviter albo- (v. interdum fulvo-) tomentelli, 

 annotini parce tomentelli v. glabrescentes, cinereo-brunnei, deinde 

 cinerascentes; gemmae glabrae v. sparse pilosae, ovatae, acutae, ad- 

 pressae, 3-3.5 mm. longae. Folia (nondum matura) oblongo-elliptica, 

 utrinque obtusa v. basi subaurita, (in 2145 apiee breviter acuta), supra 

 viridia, glabra, sed ad costam elevatam flavidam puberula, subtus 

 glauca V. initio pruinosa, glaberrima, costa elevata, nervis lateralibus 

 vix V. paulo supra interdum distinctius prominulis, margine inte- 

 gerrima, minora 1-1.5 cm. longa, 5-6 mm. lata, majora usque 2.8-3 

 cm. longa et 0.8-1 cm. lata; petioli 1-3 mm. longi, glabri. Amenta 

 ramulis folia 3-6 normalia gerentibus ut rami pilosis 0.5-3.5 cm. longis, 

 rhachi villosa, pedunculata, cf 2-5.5 cm. longa, circiter 0.5-0.8 cm. 

 crassa, subdensiflora brevius (0.5-1 cm.) pedunculata, 9 3-5 cm. 

 longa, circiter 0.6-0.7 mm. crassa, pedunculis usque 3.5 cm. longis; 

 flores cf diandri, filamentis liberis ad medium villosis, antheris flavis 

 subglobosis parvis; glandula ventralis anguste ovata, dorsali simili 

 paulo major, bracteam late obovatam parvam brunnescentem glabram 

 subaequans; ovaria ovato-oblonga, sessilia, glabra, stylo brevissimo 

 stigmatibus brevibus saepe bifidis subbreviore coronata. Fructus 

 maturi nondum visi. 



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

 shan, alt. 3300 m., June 20, 1908 (No. 2136; type; bush 0.9-1.5 m.; 9 ; 

 No. 2136% 9; No. 2160; bush 0.6 m.; d"); west and near Wen-ch'uan 

 Hsien, thickets, alt. 2300-3300 m., July 1908 (No. 2145; bush 1.5-2.4 

 m.; (^ ; No. 2145% 9 ; leaves of 9 twig acute at the apex, otherwise 

 I can see no difference). 



This species very much resembles S. cathayana Diels, but on account of the 

 dorsal gland in the cf flowers 1 place it in a different section. The region from 

 which S. dissa Schneider comes is extremely rich in endemic Willows. The male 

 flowers are very much Uke those of S. dyscrita Schneider, the dorsal gland of 

 which seems to be very small. 



The specific name is derived from Sio-o-o's, ambiguous. 



