SALICACE.K. (willow FAMILY.) 483 



oli/oiuj, closely sessile, appearing before the leaves, naked at base ; capsules 

 rather shortly pedicelted, (jreenish or reddish, spreadinn ; scales dark red or 

 brownish; style distinct ; stigmas bijid. 



7. S. humilis, Marsh. (Pkairie W.) Leaves oblanceolate or oblonq4an- 

 ccolate, the htwcst ohovate; stipules medium-sized, semi-ovate, entire or oftener 

 tootheil ; petioles distinct; anients often rec-urved, al)out 1' long. — Dry plains 

 and barrens, common. A shrub, 3-8° high, varying much in the size and 

 shape of the leaves. Hybrids witli n. 6 have otiually broad and large but duller 

 green leaves, softly tomentose beneath and witli shorter petioles, the aments 

 equally thick but usually recurved, and the capsules on shorter pedicels. Small 

 forms apparently ])ass into the next. 



8. S. tristis, Ait. (Dwarf Gray W.) Leaves small (1-2' long), crowded, 

 linear-oblanceolate, tapering to a very short petiole ; stipules minute, deciduous ; 

 aments very small, globular or oval, about ^' long in fruit. — Sandy plains or 

 on the borders of hillside thickets, common. A tufted shrub, 1-1^° I'iglb 

 rising from a strong large root. 



*+++++ Low shrubs, 3- 10° high, of cold swamps, icith slender yellowish or red- 

 dish ticigs ; leaves lanceolate, smooth above, glaucous beneath and. covered 

 when young with appressed silvery-silky hairs ; aments (especially the fertile) 

 with a few leafy bracts at base; capsule pedicelled, silvery-silky ; stigmas 

 bifd. 



= Shrubs of lowland swamps ; leaves narrowly lanceolate, 2-3' long, taper-pointed, 

 Jinely and evenly serrate ; stipules linear or semi-cordate, deciduous ; aments 

 sessiif or in fruit slightly ped uncled ; style very short. 



9. S. sericea, Marsh. (Silky W.) Leaves at first (principally beneath) 

 very silky, turning black in drying; aments narrowly cylindrical, the fertile 

 densely flowered ; capsule short-pedicelled, ovate-oblong, rather obtuse. — Com- 

 mon, but more jjrevalent from the region of the Great Lakes eastward. 



10. S. petiol^ris, Smith. Leaves only .slightly silky when young, soon 

 smooth, with less tendency to blacken in drying ; fertile aments ovoid-cylimiric, 

 in fruit broad and loose from the lengthening of the pedicels ; capsule rostrate 

 from an ovate base, rather acute. — Var. grAcilis, Anders., has extremely 

 loose aments, and very long-pedicelled attenuate-rostrate capsules. — Common, 

 but more prevalent from the Great Lakes westward. This sj)ecies, like the 

 preceding, hybridizes freely with S. cordata. 



= = Alpine shrub ; leaves 1 - 2' long, repand-crenate ; stipules minute, fugacious ; 

 aments leafy-peduncled ; style distinct. 



11. S. argyrocarpa, Anders. Leaves tapering evenly to both enns, 

 acute, or tlie earliest obovate and obtuse, at length rigid, the margin slightly 

 revolute ; petiole short ; fruiting anient short (al)out T long), loosely flowered ; 

 capsule tapering, densely silky-silvery ; gland of the staniinate flower variously 

 doubled. — Moist alpine ravines in a few limited localities on or near Mt. 

 Washington, N. H. ; also in Lower Canada and Lab. A l)ushy branched shrub, 

 erect or depressed at base, 1 -2° high, growing in wi<le dense patches. A hy- 

 brid with n. 13 was detected by Mr. E. Faxon in Tuckerman's ravine (its leaves 

 collected by Dr. Gray as early as 1842 !), appearing like a large form of the 

 ispecies with the aments of S. phylicifolia. 



