486 SALiCACE^. (willow family.) 



■*-•<--»- Prostrate or creeping and matted alpine shrubs. 



19. S. Uva-ursi, Pursh. (Bearberry W.) Leaves elliptical and 

 pointed, or obovate and obtuse, less than V long, 3-4'' wide, tapering at base, 

 slightly toothed, strongly veined, smooth and shining above, pale and rather 

 glaucous beneath; aments borne on slender lateral leaf,j peduncles, ohlong-cylin- 

 dric, 6 - 9" long, the fertile lengthening to 2' and narroAvly cylindric, densely 

 flowered above, often loose below ; scala obovate, rose-red at the tip, covered 

 with long silky hairs; stamens rarely 2; capsule ovate-conical, brownish at 

 maturity; pedicel scarcely exceeding the gland; style distinct. (S. Cutleri, 

 Tuckerm.) — Abundant over all the alpine summits of N. New Eng. and N. Y. 

 Closely prostrate, spreading from a stout central root over an area 1-2° in 

 diameter. 



20. S. herb^cea, L. Leaves roundish ora?, heart-shaped, obtuse orretuse, 

 less than 1' long, serrate, smooth and shining, reticulately veined ; aments ter- 

 viinating 2-leaved branch! ets, small, ovoid, 4 -\0 flowered ; scales concave, obovate, 

 ohtnse, glabrous or slightly pubescent ; capsule subsessile. — Alpine summits 

 of the White Mountains, and far northward. A very small herb-like species, 

 the half-underground stems creeping and rooting to a considerable extent, the 

 branches seldom rising above 1 - 2' from the ground. (Eu.) 



2. POPULUS, Tourn. Poplar. Aspen. 



Bracts (scales) of the catkins irregularly cut-lobed at the apex. Flowers from 

 a cup shaped disk which is obliquely lengthened in front. Stamens 8-30, or 

 more ; filaments distinct. Stigmas 2-4, elongated. Capsules 2 - 4-valved. — 

 Trees, with broad and more or less heart-shaped or ovate toothed leaves, and 

 often angular branches. Buds scaly, covered with resinous varnish. Catkins 

 long and drooping, appearing before the leaves. (The classical Latin name, 

 of uncertain origin.) 

 § 1. Sti/les 2, with 2-3 narrow or filiform lobes; capsules thin, oblong-conical, 



2-valved ; seeds very small ; leaves ovate. 



* Petioles laterally flattened ; bracts silky ; stamens 6-20; capsules numerous, 



small, on very short pedicels. 



P. ALBA, L. (White Poplar. Abele.) The younger branches and the 

 under surface of the rhombic-oval sinuate-tootlied acute leaves white-tomen- 

 tose ; scales crenate, fringed. — Frequently cultivated for shade, spreading 

 widely by the root, and occasionally spontaneous. (Adv. from Eu.) 



1. P. tremuloides, Michx. (American Aspex.) Small tree 20 - 50° 

 high, with smooth greenish-white bark ; leaves roundish-heart-shaped, with a 

 short sharp point, and small somewhat regular teeth, smooth on both sides, with 

 downy margins, on long slender petioles; scales cut into 3-4 deep linear di- 

 visions, fringed with long hairs. — Maine to the mountains of Penn., N. Ky., 

 Minn., and far north and westward. 



2. P. grandidentata, Michx. (Large-toothed Aspex.) Tree 60- 

 75° high, with smoothish gray bark; leaves roundish-ovate, icith large and ir- 

 regular sinuate teeth, when young densely covered with white silky wool, at 

 length smooth both sides ; scales cut into 5-6 unequal small divisions, slightly 

 fringed. — Rich woods and borders of streams, N. Scotia to the mountains of 

 N. C, west to N. Minn, and Tenn. 



