90 Flora of the Palouse Region 



T. parviflora Hook. Rough-pubescent, 15-30 cm. high: leaves palmately 

 3-5-parted; segments cuneate, 3-cleft, the lobes sometimes again cleft: ped- 

 icels erect, mostly as long as or longer than the calyx: calyx 4-6 mm. long, 

 obconic or club-shaped: petals pink, deeply 3-cleft: ovary half-inferior. 

 Stony soil, common. 



T. tenella Steudel. Much like the preceding, smaller and more slender, 

 pubescent, minutely glandular: pedicels spreading: calyx bell-shaped, 3 mm. 

 long: petals 3-7-cleft into linear lobes: ovary free except at base. With the 

 preceding, blooming about two weeks earlier. 



146. TIARELEA. 



Slender perennial herbs: leaves palmately lobed. sometimes with 

 small stipules: flowers small, white, in a terminal raceme or panicle: 

 calyx-tube campanulate, 5-parted, nearly free irom the ovary: 

 petals 5, entire, small, with short claws: stamens 10; filaments 

 long and slender: styles 2; ovary 1 -celled, 2 -horned; placentae 

 parietal, becoming almost basal in fruit; ovules numerous: capsule 

 1 -celled, 2-valved, the valves usually unequal; seeds usually few. 



T. Ullifoliata Hook. Pubescent throughout or nearly glabrous: stems 

 simple, 15-40 cm. high, erect or ascending: radical leaves ovate or orbicular, 

 cordate, long-petioled, 3-7-lobed, the lobes crenate-dentate; cauline 1-3, 

 similar but smaller, short-petioled: panicle narrow, loose, 5-15 cm. long: 

 flowers white: petals small, thread-like. Thatuna Hills, in moist woods. 



147. HEUCHERA. 



Perennial herbs: leaves mostly basal, long-petioled, rounded, 

 mostly cordate; cauline, if any, alternate; petioles with dilated 

 margins or adherent stipules: flowers greenish or purple, in clus- 

 ters which form a long narrow panicle: calyx-tube campanulate, 

 5-lobed, coherent with the lower half of the ovary; lobes some- 

 times unequal: petals 5, small, entire, sometimes minute or want- 

 ing, or early deciduous: stamens 5: styles 2, slender; 

 ovary 1 -celled, with 2 parietal placentae: capsule 1 -celled, 

 more or less 2-beaked; seeds numerous. 



H. glabella Nutt. Tufted, glabrous or nearly so below the inflorescence: 

 leaves all radical, cordate-orbicular, 5-9-lobed, obscurely crenate, the teeth 

 bristle-tipped, 2-5 cm. broad; petioles slender, mostly 2-4 times as long as 

 the blades: scapes stout, 30-60 cm. high: inflorescence a spike-like panicle, 

 glandular-puberulent: calyx yellowish, campanulate, 6-7 mm. long. Grassy 

 hillsides, common. 



1 48. MITEEEA. 



Eow slender perennial herbs: leaves simple, mostly radical, long- 

 petioled, ovate or orbicular; cauline, if an}', few and opposite: 

 flowers small, white or greenish, in a simple raceme: calyx short, 

 the broad tube 5-lobed, adherent to the base of the ovary and 

 dilated beyond it: petals 5, slender, pinnatfid or 3-cleft into thread- 

 like lobes: stamens 10 or 5, very short: st3'les 2, short; ovary 



