SALICAOEAE (willow FAMILY) 



nh 



Uva-ursi. 



657. S. herbacea. 

 (Eu.) Fig. 657. 



*+ -w- Prostrate or creeping and, matted alpine shrubs. 



17. S. Uva-ursi Pursh. ■ Leaves elliptical and pointed, or obovate 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 home 

 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. Eio. 656. 



18. S. herb&cea 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, ^10-flowered ; scales concave, obovate, obtuse, 

 glabrous or slightly pubescont ; 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. 



1- •>- Capsule pubescent. 



** 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 furms ofS. 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 1-12 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 

 vsrhen fully grown. {iS. eriocephala Michx.) Var. prinoIdes 

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

 capsules more thinly tomentose ; style longer ; stigma-lobes 

 laciniate ; leaves narrower. {S. prinoidesFnrsh.) 

 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. 



6. Aments short-stalked, leafy-hracted at base, 



appearing with the leaves ; scales pale brown 



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



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

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

 soon smooth; stipules linear or semioordate, deciduous; fertile 658, S.petlolarie 



