ROSE FAMILY 407 



1. H. parviflora Nutt. Perennial, with a short woody caudex; stem erect, 

 densely glandular, 1-2 dm. high; leaflets 5-cS pairs, densely pilose and glandular, 

 obovate or nearly orbicular, coarsely crenate; cyme subcapitate; hypanthium 

 cup-shaped, 2-3 mm. broad, tinged with purple; sepals lanceolate, 2-3 mm. long; 

 bractlets linear, nnich shorter; petals broadly cuneate, emarginate. Sagebrush 

 lands and moimtain sides: Calif. — Nev. — Ida. — Ore. Submont. Jl-Au. 



2. H. capitata Lindl. Perennial; stem erect, rather simple, 4-6 dm. high, 

 nearly glabrous below, glandular-hirsute above; basal leaves 2-3 dm. long, pin- 

 nate, nearly glabrous; leaflets 5-7 pairs, obovate or oval, 2-3 cm. long, deeply 

 incised-toothed; stem-leaves similar, but the upper with narrower oblanceolate 

 acute leaflets; h>T5anthium glandular-hirsute, deeply cup-shaped; bractlets 

 linear, nearly equalling the triangular-lanceolate acuminate sepals; petals broadly 

 cuneate, .5-6 mm. long, truncate at the apex. Mountains: Ore. — Ida. Sub- 

 mont. Je-Jl. 



3. H. fusca Lindl. Perennial, with a short woody caudex; stems several, 

 2-6 dm. high, more or less glandular, often more or less tinged with brown or 

 purple; basal leaves 1-2 cm. long, somewhat glandular-pubescent or glabrate; 

 leaflets 5-7 pairs, obovate or cuneate, toothed or incised toward the apex, 1-2 

 cm. long; hypanthium glandular-villous, cupulate; bractlets linear, much shorter 

 than the ovate-lanceolate sepals; petals broadly cuneate, 3-4 mm. long, truncate 

 at the apex. Oi'e. — Calif. — Nev. — Ida. Son. — Submoid. Je-Au. 



10. IVESIA T. & G. 



Perennials, with thick erect rootstocks and short, often woody caudices. 

 Leaves mostly basal and numerous, pinnately divided iLsually into numerous 

 small more or less crowded and imbricate leaflets. Inflorescence cymose. Hy- 

 panthium from deeply campanulate or turbinate to saucer-shaped. Bractlets, 

 sepals, and petals 5. Petals usually oblanceolate and more or less clawed, but 

 sometimes nearly orbicular and practically clawless, white or yellow. Stamens 

 5-20, inserted in the throat of the hypanthium; filaments filiform. Receptacle 

 from hemispheric to flat, usually poorly developed and bearing 3-15 pistils sur- 

 rounded by a ring of prominent bristles. Styles long and slender, terminal or 

 nearly so. Ovules and seeds pendulous and anatropous. 



Leaflets numerous, more or less crowded, usually divided to near the base. 



Stem leafy; stamens 20; claws of the wliite petals obsolete. 1. /. Kingii. 



Stem few-loaved or scapiform ; stamens 5 ; petals yeUow or yellowish, clawed. 

 Cyme corymbiform; hypanthium cup-shaped. 



Bractlets linear; stem decumbent. 2. I. utahensis. 



Bractlets oblong or lanceolate; stem erect. 3. /. mutabilis. 



Cyme subcapitate; hypanthium campanulate. 4. /. Gordonii. 



Leaflets comparatively few. obovate, merely incised. 5. I. beneolens. 



1. I. Kingii S. Wats. Perennial, with a thick, deep and woody root, crowned 

 with a very short erect caudex; stems several, leafy, glabrous, prostrate, 2-4 dm. 

 long; basal leaves numerous, glabrous, pinnate, with 20-25 pairs of crowded 

 leaflets, glabrous; leaflets 3-5 mm. long, divided to the base into 2-4 ovate or 

 oblong segments; cyme narrow; hypanthium saucer-shaped, in fruit 3-4 mm. in 

 diameter; petals white, obovate or broadly spatulate, much exceeding the sepals; 

 stamens 20. Desert regions: Nev. — -w Iltah. Son. Je-Au. 



2. I. utahensis S. Wats. Perennial, with a woody but not very thick root, 

 crowned by a ccspitose caudex; stems several, about 1 dm. high, glabrous below, 

 glandular above; basal leaves glabrous, pinnate, with 15-20 pairs of crowded 

 leaflets, these 2-4 mm. long, cleft to the base into 3 to 5, broadly oblong to spatu- 

 late segments; stem-leaves few and very small; hypanthium somewhat glandular- 

 puberulent, cup-shaped, veiny, 3 mm. in diameter; petals yellowish, spatulate, 

 scarcely exceeding the sepals; stamens 5. Mountains: Utah. Mont. — -Subalp. 

 Au. 



3. I. mutabilis (Brand.) Rydb. Perennial, with a very thick woody root 

 and short caudex; stems several, 3 dm. high, somewhat villous or nearly gla- 

 brous; basal leaves numerous, pinnate, with numerous leaflets, villous and some- 

 what glandular; leaflets sessile, more or less imbricate, 2-5 mm. long, usually 



