SAXIFRAGE FAMILY 383 



yellowish, spatulate, with a broad, short claw. Hills: Alta. N.M. Ariz. 

 Ore. Submont. -Alp. My-Au. 



13. H. flabellifolia Rydb. Flowering branches slender, 2-3 dm. high, 

 glandular-puberulent, subscapose; leaf -blades 1.5-3 cm. broad, rounded-reni- 

 form, cleft one-third to one-half to the base into 7-9 somewhat cuneate lobes, 

 which are rounded-crenate at the apex, the sinuses between the lobes of the leaves 

 very narrow and rounded at the bottom, the lobes often overlapping. H. parvi- 

 folia dissecta M. E. Jones. Hills and mountain sides : Alta. Mont. n Wyo. 

 Plain Mont. My-Au. 



14. H. chlorantha Piper. Flowering branches scapiform, villous with 

 long (in age brown) hairs, 5-7 dm. high; leaf -blades reniform or rounded-cordate, 

 5-8 cm. wide, round-lobed and with ovate cuspidate teeth; inflorescence dense; 

 hypanthium hirsute and glandular, together with the oblong sepals 7-8 mm. or 

 in fruit over 1 cm. long; petals minute or usually lacking. H . cylindrica T. & G., 

 not Dougl. Low ground and river banks: B.C. Ore. Ida. Submont. Jl- 

 Au. 



15. H. ovalifolia Nutt. Flowering branches scapiform, naked, densely 

 glandular-pubescent, with short hairs; leaf-blades rounded-oval, 1.5-4 cm. 

 broad and 2-5 cm. long, truncate, rounded or slightly cordate at the base, round- 

 lobed, and crenate; hypanthium together with the broadly oblong sepals about 

 7 mm. long; petals usually wanting. H. cylindrica alpina S. Wats. H. saxicola 

 E. Nels. Rocky banks and hillsides: Alta. -Wyo. Ore. 'B.C. Submont. Alp. 

 Je-Au. 



16. H. cylindrica Dougl. Flowering branches scapiform, naked, hirsute 

 with white hairs, about 5 dm. high; leaf -blades orbicular or nearly so, deeply 

 cordate at the base, glabrous or ciliate on the margins and veins, thin and shin- 

 ing, 3-6 cm. broad, round-lobed and crenate; inflorescence spike-like; hypanthium 

 together with the oblong sepals 6-9 mm. long. H. colurnbiana Rydb. Hills: 

 Ore. -Ida. Mont. B.C. Submont. My-Jl. 



17. H. glabella T. & G. Flowering branches scapiform, 4-6 dm. high, 

 glandular-puberulent or glabrous; leaf-blades rounded-oval or orbicular, slightly 

 cordate or truncate at the base, 2-5 cm. wide, glabrous or minutely glandular- 

 puberulent, with ciliate margins, round-lobed and with rounded teeth; inflorescence 

 narrow, elongate; hypanthium together with the broadly oblong sepals about 

 7 mm. long. Rocky hills: Alta. 'Mont. Ore. 'Wash. Submont. Je-Au. 



18. H. tenuifolia (Wheelock) Rydb. Flowering branches scapiform, 4-6 

 dm. high, glabrous or minutely glandular-puberulent; leaf-blades reniform or 

 rounded, deeply cordate at the base, thin, glabrous, round-lobed and crenate; 

 hypanthium together with the oblong obtuse sepals about 6 mm. long; petals 

 oblanceolate, shorter than the sepals. H. cylindrica tenuifolia Wheelock. Hill- 

 sides: Ida. Wash. 'Ore. Submont. My-Au. 



10. TIARELLA L. FALSE MITERWORT. 



Perennial herbs, with scaly rootstocks and lateral leafy flowering branches. 

 Leaves petioled; blades cordate in outline. Stipules present. Inflorescence 

 racemose or paniculate. Hypanthium small, short-campanulate, almost free 

 from the gynoecium. Sepals 5, ovate or lanceolate. Petals clawed, with oblong 

 or elliptic blades, or else clawless and filiform. Stamens 10, exserted, with long 

 filiform filaments. Gynoecium 1-celled, with 2 parietal nearly basal placentae. 

 Capsule membranaceous, with 2 very unequal valves. Seeds few. 



1. T. unifoliata Hook. Flowering branches 1.5-4 dm. high, glabrous or 

 viscid-puberulent above, or slightly hirsute, 1-4-leaved; leaf -blades broadly cor- 

 date, sparingly hirsute or in age glabrate, 4-10 cm. wide, coarsely 3-5-lobed, 

 with broadly ovate, acute, doubly crenate, mucronate teeth; inflorescence a 

 narrow panicle; sepals whitish, ovate-oblong; petals linear-subulate, white, fully 

 3 times as long. Shaded ravines and woods: B.C. Alta. Ida. 'Calif. Mont. 

 My-S. 



