466 SALICACE^E. (WILLOW FAMILY.) 



long, the fertile loose in fruit ; stalk of the ovary slender, longer than the green- 

 ish-yellow scale. (S. pedicellaris, Pursh., more luxuriant than the European 

 plant.) Cold peat-bogs, New England to Wisconsin and northward. (Eu.) 

 * # Prostrate or spreading and matted, alpine. 



19. S. Clitleri, Tuckerman. (CUTLER'S W.) Leaves elliptical and 

 pointed, or obovate and obtuse, tapering at the base, slightly toothed, strongly 

 veiny, smooth and shining atibve, pale and rather glaucous beneath ; catkins mostly 

 lateral, oblong-cylindrical ; ovary smooth, short-stalked ; style distinct ; stamen sin- 

 gle; scales oblanceolate, entire, black, covered with long silky hairs. (S. Uva-Ursi, 

 Pursh, in part, & Ed. 2.) Alpine summits of the high mountains of Maine, 

 New Hampshire, and New York. 



20. S. argyrocarpa, Anders. (SILVERY-FRUITED W.) Leaves lanceo- 

 late, acute, or the earliest obovate and obtuse, irregularly repand-crenate, smooth 

 and green above, covered beneath when young with long and shining deciduous hairs, at 

 maturity smooth and glaucous ; catkins ovoid, short ; ovary densely silvery-silky, 

 stalled ; style distinct ; stamens 2-3; gland sometimes double ; scales obovate, 

 obtuse, clothed with long hairs. (S. repens, Ed. 2, but is much nearer S. 

 arbuscula, L.) Moist alpine ravines of the White Mountains, New Hamp- 

 shire. Whole plant,/ when young, of a glossy satiny lustre ; the leaves at 

 length becoming quite smooth, with a white and prominent midrib, and slightly 

 elevated veins. 



21. S. herbacea, L. (HERB-LIKE W.) Leaves roundish-oval, heart-shaped, 

 notched at the apex, serrate, smooth and shining, with reticulated veins ; catkins 

 issuing from the terminal buds, small and few-flowered ; ovary sessile, smooth ; scales 

 smooth, ciliate. Alpine summits of the White Mountains of New Hampshire, 

 and high northward. A very small herb-like species, the stems seldom rising 

 above an inch or two 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 elongated. Trees, with broad and more 

 or less heart-shaped or ovate-toothed leaves, and mostly angular branches. Buds 

 scaly, covered with resinous varnish. Catkins long and drooping, appearing 

 before the leaves. (The ancient name, called Arbor Populi, because it was used 

 to decorate the public walks, or on account of the constant agitation of the 

 leaves by every impulse.) 



1. P. tremuloides, Michx. (AMERICAN ASPEN.) Leaves roundish- 

 heart-shaped^ with a short sharp point, and small somewhat regular teeth, smooth 

 on both sides, with downy margins ; scales cut into 3-4 deep linear divisions, 

 fringed with long hairs. Woods : common. Tree 20 - 50 high, with 

 smooth greenish-white bark. Leaf-stalk long, slender, and laterally com- 

 pressed, which accounts for the continual agitation of the foliage by the slight- 

 est breeze. 



2. P. grandidentata, Michx. (LARGE-TOOTHED ASPEN.) Leaves 

 roundish-ovate, with large and irregular sinuate teeth, when young densely covered 



