52 WILSON EXPEDITION TO CHINA 
A very 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 1 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 ¢daidipos, 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 apice 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 
em. longa et 0.8-1 em. lata; petioli 1-3 mm. longi, glabri. Amenta 
ramulis folia 3-6 normalia gerentibus ut rami pilosis 0.5-3.5 em. longis, 
rhachi villosa, pedunculata, c 2-5.5 em. longa, circiter 0.5-0.8 em. 
crassa, subdensiflora brevius (0.5-1 cm.) pedunculata, 9 3-5 cm. 
longa, circiter 0.6-0.7 mm. crassa, pedunculis usque 3.5 em. longis; 
flores ¢ 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.; 4); west and near Wén-ch'uan 
Hsien, thickets, alt. 2300—3300 m., July 1908 (No. 2145; bush 1.5-2.4 
m.; g; 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 e flowers I 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 like those of S. dyscrita Schneider, the dorsal gland of 3 
which seems to be very small. 
The specific name is derived from 9waós, ambiguous. 
