1522 ARBORETUM AND FKUTICETUM. PART III. 



* 25. S. PuRSH/^fti Borrer. Pursh's- Willow. 



Identification. Mr. Borrer suggests that this species may be called S. Purshiana, as there is an 



older S. ambigua. (Borrer in a letter.) 

 Synonyme. S. ambfgua Pursh Fl. Amer. Sept., 2. p. 617., Smith in Rees's Cyclo., 36., Forbes in Sal. 



Wob., No. 154., Hook. Br. FL, ed. 2., incidentally under S. ambigua Ehrh. 

 The Sexes. The male is described in Sal. Wob. 



Spec. Char., fyc. Leaves lanceolate, pointed, serrated, glabrous; shining above, 

 glaucous underneath. Footstalks stout, glandular at the summit. Stipules 

 half-heart-shaped, serrated, deciduous. Catkins accompanying the leaves. 

 Stamens 2. Bracteas rounded and concave. (Sal. Wob., p. 282.) A native 

 of North America, in low grounds ; and flowering in March and April. 

 This appears to be a rapid-growing tree, with round, greenish-brown, 

 smooth branches. The leaves are from 5 in. to 6 in. long, and about 1^ in. 

 in breadth, somewhat resembling those of S. Russellzarza, but much broader, 

 and more obtuse at the base ; wherein they resemble those of S. fragilis ; 

 they, however, differ from this species by their very white glaucous hue 

 underneath ; the serratures are, likewise, much coarser, and they are glandu- 

 lar, which is very obvious in the young leaves, that are generally furnished 

 with two obtuse glands at the insertion of the footstalks, which sometimes 

 run into small leaflets. Footstalks stout, glabrous. Catkins appearing 

 with the leaves. Stamens 2 in a flower. There are plants under the name 

 of S. ambigua in the Hackney and Goldworth arboretums ; also at Woburn 

 Abbey, and Henfield. 



App. i. Frdgiles introduced, but not yet described, or of doubtful 



Identity. 



S. adscendens in Donald's Nursery. This kind is extremely dissimilar to the S. adscendens of 

 Ens. Bot. and Sal. Wob. S. bigtmmis 'Lodd. Cat., ed. 1836. Specimens were received from the 

 Hackney and Goldworth arboretums, which appear quite different from the S. bigemmis of Hoff- 

 mann which is identified with S. rfaphnoldes Pillars. S. decipiens, fern., Lodd. Cat., ed. 1836. S. 

 fragilis and S. murma Lodd. Cat, ed. 1836. S. rUbra G. Lodd. 



App. ii. Fragiles described, but not yet introduced, or of doubtfid 

 Identity with introduced Species. 



S frdeilis, mas et fern., Host SaL Aust, 1. p. 5. t. 18, 19., Fl. Aust, 2. p. 635. S.fragilior, mas et 

 fern Host Sal. Aust., 1. p. 6. t. 20, 21., Fl. Aust., 2. p. 636. S. fragitissima, mas et fern., Host Sal. 

 Aust, 1. p. 6. t. 22, 2-3., Fl. Aust., 2. p. 636. ; synon. S. fragilis Host Syn., p. 52?. S. palustris, maa 

 et fern., Host Sal. Aust., 1. p. 7. t. 24, 25. ; Fl. Aust., 2. p. 637. S. capdnsis Thunb. Fl. Cap., 1. 

 p 139 Smith in Rees's Cyclo., under No. 42., resembles S. baby!6nica, and is probably a variety 

 of that species. S. subserruta Willd. Sp. PL, 4. p. 671., Smith in Sees's Cyclo., No. 45. (S. Sdfsaf 

 bte'Ucdi Forsk. Cat PI. jfcgypt, 76.), is described as having a leaf very like that of S. baby!6nira. 

 (Rees's Cyclo.) 



Group vi. Alba Borrer. 

 Trees of the largest Size, with the general Aspect of the Foliage ivhltish. 



Stamens 2 to a flower. Ovary glabrous. Flowers loosely disposed in the 

 catkin. Leaves lanceolate, serrated with glanded serratures; hairy, espe- 

 cially while young, with appressed silky hairs, which give to the foliage a 

 light or whitish hue. Plants trees of considerable height. (Hook. Br. Fl. y 

 ed. 2., adapted.) 



26. S. A'LBA L. The whitish-leaved, or common white, Willow. 



Identification. Lin. Sp. PI., 1449. ; Willd. Sp. PI.. 4. p. 710. : Sm. Eng. Bot., t. 2430.; Eng. FL, 4. 



p. 231. ; Forbes in Sal. Wob., No. 136. ; Hook. Br. Fl., ed. 3. ; Mackay Fl. Hibern., pt. 1. p. 247. ; 



Hayne Abbild., p. 254. ; Host Sal. Aust., 1. p. 9. ; Pursh FL Amer. Sept., 2. p. 616. 

 Synonymes. S&lix Raii Syn., 447., Ger. Emac., 1389. with a fig. ; S alba, part of, Koch Comm., 



p. 16. ; the Huntingdon, or Swallow-tailed Willow. (Pontey's Prof. Planter, ed. 1816, p. 92.) 

 The Sexes. Neither is rare in England. Both are described in Eng. Fl., and both figured in Eng. 



Bot., Sal. Wob., Host Sal. Aust., and Hayne Abbild. 

 Engravings. Eng. Bot, t. 2430. ; Sal. Wob., No. 136. ; Host Sal Aust, 1. 1. 32, 33. ; Hayne Abbild., 



t. 197.; our Jigt. 1314. and 1315. ; Jig. 136. in p. 1629. ; and the plates of this tree in our last 



Volume. 



