ROSE FAMILY 429 



1. A. gryposepala Wallr. A perennial, with short thick rootstocks; stem 

 3-18 dm. high, sparingly hirsute and glandular-granulif erous ; principal leaflets 

 5-9, oval or obovate, or those of the upper leaves narrower, coarsely serrate, 

 acute, glabrous or sparingly strigose above, hirsute and glandular-granuliferous 

 beneath, 4-12 cm. long; petals 2.5-3 mm. long, bright yellow; fruiting hypan- 

 thium 4-5 mm. long, abruptly contracted at the base, strigose, strongly grooved 

 A. hirsute Bickn. Thickets: N.S. N.D. N.M. S.C.; Calif.; Mex. Plain 

 Submont. Je-Au. 



2. A. striata Michx. A perennial, with stout rootstock and fibrous roots; 

 stem 3-20 dm. high, hirsute and glandular-papillose; principal leaflets 7-13, 

 hispidulous or scabrous above, copiously glandular-granuliferous and somewhat 

 pubescent beneath, lanceolate, elliptic, or oblanceolate, or rhombic-obovate, 

 acuminate, sharply serrate, 3-10 cm. long; petals deep yellow, obovate, 3 mm. 

 long; fruiting hypanthium 5 mm. long, turbinate, strongly ribbed, glandular- 

 granuliferous. A. Brittoniana Bickn. ' Roadsides and copses: N.S. BC 

 N.M. W.Va. Plain Submont. Jl-Au. 



23. COLEOGYNE Torr. BLACK BUSH. 



Shrubs, with linear-clavate, entire, opposite, crowded leaves and opposite 

 spinescent branches; leaf-blades deciduous. Flowers solitary, terminating short 

 branches. Calyx coriaceous, yellowish or brownish; sepals 4, connate at the 

 base, persistent. Corolla wanting. Stamens 30-40; filaments slender, dis- 

 tinct, except at the very base, there slightly adnate to a tubular sheath-like 

 prolongation of the disk, separating the stamens from the pistil. Gynoecium 

 of a single pistil; ovary 1-ovuled, 1-celled; style lateral, filiform, bent and twisted, 

 very villous, exserted, stigmatose on one side; ovules hemitropous. Fruit an achene. 



1. C. ramosissima Torr. A shrub, 1-2 m. high, with divergent opposite 

 branches, with at first ashy, in age black bark; leaves clavate, strigose, 5-15 

 mm. long, flat above, 4-grooved beneath; sepals yellowish or brownish, 7-8 mm. 

 long, the outer lanceolate, acute, the inner ovate or obovate, acuminate; tubular 

 sheath 4-5 mm. long; style villous. Desert mesas and foothills: sw Colo. 

 s Calif. Ariz. Son. Ap-My. 



24. WALDSTEINIA Willd. BARREN STRAWBERRY. 



Herbs, with perennial rootstocks and membranous stipules. Leaves basal, 

 palmately 3-5-foliolate or 3-7-lobed. Stem in our species scapiform. Hypan- 

 thium mostly obconic. Sepals 5, valvate, spreading. Petals 5, yellow, obovate. 

 Stamens numerous; filaments subulate, flattened below. Pistils 1-6, inserted on 

 a short villous receptacle; styles filiform, terminal, deciduous. Achenes ob- 

 liquely ovoid, pubescent. Seeds erect. 



1. W. idahoensis Piper. Leaf -blades orbicular, slightly 5-7-lobed, cordate 

 at the base, coarsely and doubly crenate-dentate, sparsely hirsute above and on 

 the margin, 2-5 cm. broad; scapes 1-2.5 dm. long, glabrous or nearly so; inflores- 

 cence glandular-puberulent, 2-7-flowered; hypanthium obconic, 4 mm. long; 

 sepals triangular-lanceolate, acute, 5-6 mm. long; petals yellow, orbicular, 

 equalling the sepals. Mountains: Ida. Submont. Jl. 



26. DRYAS L. DRYAD, MOUNTAIN AVENS. 



Low depressed undershrubs, strongly cespitose, with short horizontal branches. 

 Leaves alternate, petioled, simple, crenate or entire, white-tomentose beneath. 

 Flowers solitary on naked peduncles. Hypanthium saucer-shaped, little de- 

 veloped. Bractlets wanting. Sepals 8-10, persistent. Petals 8-10, obovate or 

 oval. Stamens numerous, inserted in the mouth of the hypanthium; filaments 

 subulate. Pistils numerous, sessile; style terminal, persistent, elongate and 

 plumose in fruit. Fruit indehiscent, 1-seeded. Seeds basal, ascending. 



Sepals linear or linear-lanceolate; petals white, spreading. 



Leaf-blades entire or with a few acutish teeth, shining and not conspicuously rugose 



above, broadest near the base. 1. D. integrifoha. 



Leaf-blades coarsely round-crenate, dull, strongly rugose and impressed-reticulate 



above, broadest near the middle. 2. D. octopetala. 



