SALICACEAE (WILLOW FAMILY) 



325 



656. S. Uva-ursi. 



65T. S. herbacea. 

 (Eu.) FIG. 657. 



++ ++ Prostrate or creeping and matted alpine shrubs. 



17. S. Uva-ursi Pursh. Leaves elliptical and pointed, orobovate and obtuse, 

 0.5-2.5 cm. long, tapering at base, slightly toothed, strongly veined, smooth and 



shining above, pale and rather glaucous beneath ; aments borne 

 on slender lateral leafy peduncles, thick-cylindric, the fertile 

 lengthening to 2 or 3 cm. and becoming narrowly cylindric, 

 densely flowered above, often loose below ; scales obovate, rose- 

 red at the tip, covered with long silky hairs ; 

 stamen 1 (rarely 2); capsule ovoid-conical, 

 brownish at maturity ; pedicel scarcely 

 exceeding the gland; style distinct. Lab. 

 to Alaska, s. to alpine summits of n. N. E. 

 and N. Y. Closely prostrate, spreading 

 from a stout central root over an area 3-9 

 dm. broad. FIG. 656. 



18. S. herbacea L. Leaves roundish oval, heart-shaped, 

 obtuse or retuse, 1-3 cm. long, serrate, smooth and shining, 

 reticulately veined ; aments terminating 2-leaved branchlets, 

 small, ovoid, 4-W-flowered ; scales concave, obovate, obtuse, 

 glabrous or slightly pubescent ; capsule subsessile. Arctic 

 Am., s. to alpine regions of Mt. Katahdin, Me., and Mt. 

 Washington, N. H. A very small herb-like species, the 

 half-underground stems creeping and rooting in moss or 

 humus, the branches seldom rising 0.5 dm. from the ground. 



- - Capsule pubescent. 



M. Fruiting pedicel 3-6 times the length of the gland; style short or none (elon- 

 gate in no. 25). 



= Mature leaves glabrous or glabrate beneath, or at most with a few scattered 

 hairs. (Extreme forms o/S. rostrata may be looked for here.) 



a. Aments sessile on the old wood, naked at base, appearing before the leaves ; 

 scales dark red, brown, or blackish; mature capsule 7-12 mm. long. 



19. S. discolor Muhl. (GLAUCOUS W.) Leaves lanceolate to elliptic, smooth 

 and bright green above, soon smooth and glaucous beneath, irregularly crenate- 



serrate, the serratures remote at base, closer, finer and becom- 

 ing obsolete toward the point ; stipules 1 cm. or more long and 

 sharply toothed, or small and nearly entire ; aments thick, 

 cylindrical, 2.5-7 cm. long, appearing in earliest spring ; scales 

 copiously clothed with long glossy hairs; style short but 

 distinct. FIG. 658. Var. ERIOCEPHALA (Michx.) Anders. 

 Aments more densely flowered and more silvery-silky ; leaves 

 sometimes retaining a ferruginous pubescence beneath even 

 when fully grown. (S. eriocephala Michx.) Var. pRixoiDES 

 (Pursh) Anders. Aments more loosely flowered, less silky ; 

 capsules more thinly tomentose ; style longer; stigma-lobes 

 laciniate; leaves narrower. (S. prinoides Pursh.) 

 Includes narrow-leaved forms of the type, and 

 others which are probably hybrids with S. cor- 

 data. Large shrub or small tree of low mead- 

 ows and river-banks, common. The just 

 expanding leaves are often overspread with evan- 

 escent ferruginous hairs. 



b. Aments short-stalked, leafy-bracted at base, 

 appearing with the leaves ; scales pale brown 

 8. discolor. or yellowish ; mature capsule 4-6 mm. long. 



20. S. petiolaris Sm. Leaves narrowly lanceolate, taper- 

 pointed, finely and evenly serrate, slightly silky when young, 



soon smooth ; stipules linear or semicordate, deciduous ; fertile 669. S. petiolaris. 



