1522

ARBORETUM AND FRUTICETUM.

PART III.

25. S. Pursmia'NA Borrer. Pursh’s Willow.

Identification. Mr. Borrer suggests that this species may be called S. Purshjana, as there is anolder S. ambigua. {Borrer in a letter.)

Synonyme. S. ambigua Pursh FI. Amer. Sept., 2. p. 617., Smith in’ Rees's Cyclo., 36., Forbes in Sal.

Wob No. 154., Hook. Br. FI. , ed. 2., incidentally under S. ambigua Ehrk.

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

Spec. Char.,$c. Leaves lanceolate, pointed, serrated, glabrous; shining above,glaucous underneath. Footstalks stout, glandular at the summit. Stipuleshalf-heart-shaped, serrated, deciduous. Catkins accompanying the leaves.Stamens 2. Bracteas rounded and concave. (Sal. Wob., p. 282.) A nativeof 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 1J in.in breadth, somewhat resembling those of S. Russellia'na, 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 hueunderneath; the serratures are, likewise, much coarser, and they are glandu-lar, which is very obvious in the young leaves, that are generally furnishedwith two obtuse glands at the insertion of the footstalks, which sometimesrun into small leaflets. Footstalks stout, glabrous. Catkins appearingwith the leaves. Stamens 2 in a flower. There are plants under the nameof S. ambigua in the Hackney and Goldworth arboretums ; also at WoburnAbbey, and Henfield.

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

Identity.

S. adsce'ndens in Donald’s Nursery. This kind is extremely dissimilar to the S. adscendens ofEng. Bot. and Sal. WOb. S. bigimmis ILodd. Cat., ed. 1836. Specimens were received from theHackney and Goldworth arboretums, which appear quite different from the S. bigemmis of Hoff-mann, which is identified with S. daphnoides Pillars. S. decipiens, fem., Lodd. Cat., ed. 1836. S.Jragilis and S. murina Lodd. Cat., ed. 1836. S. ritbra G. Lodd.

App. ii. Fragiles described, but not yet introduced, or of doubtfulIdentity with introduced Species.

S. fragilis, mas et fem., Host Sal. Aust., 1. p. 5. t. 18,19., FI. Aust., 2. p. 635. &. fragilior, mas etfem., Host Sal. Aust., 1. p. 6. t. 20, 21., FI. Aust., 2. p. 636. S .fragilissima, mas et fem.. Host Sal.Aust., 1. p. 6. t. 22, 23., FI. Aust., 2. p. 636.; synon. S. fragilis Host Syn., p.527. S. palustris, maset fem., Host Sal. Aust., 1. p. 7. t. 24, 25. j FI. Aust., 2. p. 637. S. capdnsis Thunb. FI. Cap., 1.p. 139., Smith in Rees's Cyclo., under No. 42., resembles S. babyldnica, and is probably a varietyof that species. S. subserrata Willd. Sp. PL, 4. p. 671., Smith in Rees's Cyclo., No. 45. {S. Sdfsafbce’llcdi Forsk. Cat. PI. JEgypt., 76.), is described as having a leaf very like that of S. babyldnica.{Rees's Cyclo.)

Group vi. A'lbce Borrer.

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

.ii

Stamens 2 to a flower. Ovary glabrous. Flowers loosely disposed in thecatkin. Leaves lanceolate, serrated with glanded serratures; hairy, espe-cially while young, with appressed silky hairs, which give to the foliage alight or whitish hue. Plants trees of considerable height. (Hook. Br. FI.,ed. 2., adapted.)

26. S. a Aba L. The whitish-leaved, or common white, Willow,

Identification. Lin. Sp. PL, 1449. j Willd. Sp. PL, 4. p. 710.: Sm. Eng. Bot., t. 2430.: Eng. FL, 4.p. 231.; Forbes m Sal. Wob., No. 136.; Hook. Br. FI., ed. 3.; Mackay FL Hibern., pt. 1. p. 247.;Hayne Abbild., p. 254.; Host Sal. Aust., 1. p. 9.; Pursh FI. Amer. Sept.,2. p. 616.

Synonymes. Skhx 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. nob., Host Sal. Aust., and Hayne Abbild

Engravings. Eng. Bot., t. 2430.; Sal. Wob., No. 136.; Host Sal Aust., 1.1. 32, 33.; Hayne Abbild.,

. 197.; our figs. 1314. and 1315. ; fig. 136. in p. 1629. ; and the plates of this tree in our last

Volume.