SAXIFRAGE FAMILY 381 



most often campanulate, adnate to the lower part of the gjiioecium, often more 

 or less oblique. Sepals 5, often very unequal. Petals 5, often more or less 

 clawed. Stamens 5, opposite to the sepals; filaments usually filiform. Gynoe- 

 cium partly inferior, 1-celleil, with 2 parietal, many-ovuled placentae; styles 2, 

 distinct, elongate. Capsule opening between the two more or less divergent 

 beaks. 



Stamens equalling or exceeding the sepals. 

 Panicle open, not spike-like. 



Hypantliium turbinate, about as broad as long; stamens at least twice as long 



" as the sepals. 1. H. glabra. 



Hypantliium deeply campanulate or urceolate, about twice as long as broad; 

 stamens slightly exceeding the sepals. 

 Hypantliium strongly oblique. 



Hv-pantliium with the sepals more than 1 cm. long; petioles glabrous or 



" sparingly short-hairy. 2. //. Richardsonii. 



Hypanthium with the sepals less than 1 cm. long; petioles long-Mspid. 



3. H. hispida. 

 Hypanthium not strongly obUque. 4. //. rubescens. 



Panicle contracted, dense, spike-like. 5. H. bracteata. 



Stamens shorter than the sepals. 



Hypanthium short-campanulate to saucer-shaped, together with the sepals 3-5 mm. 

 long. 

 Petioles more or less liirsute. 6. H. novomexicana. 



Petioles glabrous or puberulent. 



Hypantliium campanulate, yellowish or pinkish; sepals almost erect. 



Leaf-blades deeply lobed; lobes again lobed and toothed; petals narrowly 

 oblanceolate, nearly twice as long as the sepals. 



7. //. gracilis. 

 Leaf-blades merely once 5-7-lobed and toothed; petals spatulate, from 

 equalling to half longer than the sepals. 

 Base of the leaf-blades with an open sinus, or almost cuneate; plant 



1-3 dm. liigh. 8. H. Hallii. 



Base of the leaf- blades with a narrow sinus; plant 3-5 dm. high. 



9. H. grossulariifolia. 

 Hypanthium saucer-shaped; sepals spreading. 



Hypantliium with the sepals 4 mm. high, yellowish; blades of the petals 



rhombic. 10. //. ftavescens. 



Hypantliium with the sepals 2-3 mm. high, greenish; petals oblanceolate 

 or spatulate. 

 Leaf-blades with shallow lobes. 



Sinus of the leaf-blades closed, the basal lobes often overlapping; 



petals not exceeding the sepals. 11. H. utahensis. 



Sinus of the leaf-blades open; petals exceeding the sepals. 



12. H. parrifolia. 

 Leaf-blades cleft at least one-half to the base. 13. H. flabellifolia. 

 Hypanthium deeply campanulate or urceolate, with the sepals 5-10 mm. long. 

 Flowering branches and petioles pubescent. 



Flowers greenish ' leaf-blades reniform or rounded, deeply cordate at the base 



lobes and teeth rounded; petioles long-hairy. 14. H. chlorantha. 



Flowers yellowish; leaf-blades broadly oval to orbicular, trimcate or slightly 

 cordate at the base. 

 Leaf-blades thick, densely glandular-pubescent, 1.5-4 cm. wide, rarely 



cordate at the base. 15. //. ovalifolia. 



Leaf-blades tliin, glabrous, or hairy only on the veins, 3-6 cm. wide, cordate 

 at the base. 16. H. cylindrica. 



Flowering branches and petioles glabrous or fhiely puberulent. 



Flowers yellowish; leaf-blades rounded-oval to orbicular, truncate or sUghtly 



cordate at the base, only the earliest reniform. 17. H. glabella. 



Flowers greenish; leaf-blades thin, reniform or rarely rounded, with deeply 

 cordate base. 18. H. tenuifolia. 



1. H. glabra ^yilld. Flowering branches 1-5 dm. high, glabrous, 1-3- 

 leaved, rareh' scapiform; leaf-blades cordate or round-cordate, deeply 5-7- 

 lobed, sparingly hispidulous when young, soon glabrate, thin and shining, 3-10 

 cm. broad; lobes triangular-ovate, doubly serrate; panicle lax; h>^^anthium 

 with the sepals 2.5-3 mm. long; petals broadly spatulate or ovate, with a slender 

 claw, about twice as long as the sepals. Damp shady rocks: Yukon— Alta. — ■ 

 Ore. — Alaska. Mont. Je-S. 



2. H. Richardsonii R. Br. Flowering branches 3-4 dm. high, scapiform, 

 sparingly short-hirsute and glandular-puberulent above; leaf -blades rounded- 

 cordate, 3-6 cm. broad, with rounded lobes and broadly ovate teeth, sparingly 

 hispidulous, ciliate on the margins; jietals spatulate, purplish, slightly exceeding 

 the oblong sepals. Hills: Man. — S.D.— B.C. Plain — Submont. Je. 



