SAXIFRAGACEAE. 193 



gent beaks; ovary and capsule usually 2-celled with axile placen- 

 tae; seeds numerous. 



Stipules scarious or foliaceous. T. intermedium. 



Stipules represented by bristles. . T. datum. 



Therofon intermedium (Piper) Heller. Sparsely pubescent, glandular in 

 the inflorescence; stems rather stout, 40-50 cm. high, few-leaved; basal leaves 

 orbicular, cuneate at base, subreniform with a broad sinus, 5-7-cleft, the lobes 

 incisely toothed, 5-9 cm. broad; cauline similar but smaller and with stipules; 

 peduncles axillary, 6-12-flowered; calyx campanulate, its lobes triangular; 

 petals obovate, white, 4-5 mm. long. 



Chehalis County, Washington, Lamb. Very closely allied to T. majus 

 (Gray) Wheelock which occurs in Idaho, southern Oregon and California. 



Therofon elatum (Nutt.) Greene. Sparsely hirsute with reddish hairs; 

 stems slender, 40-70 cm. high, few-leaved; basal leaves reniform cordate, 

 5-9-lobed, incisely serrate, slender-petioled, 2-5 cm. broad; cauline similar 

 but smaller; inflorescence a long loose panicle; calyx deeply campanulate, its 

 lobes acute; petals spatulate-oblong, white, 4-6 mm. long. 



Rocky banks of streams, Vancouver Island to California. 



255. CHRYSOSPLENIUM. 



Low and small glabrous herbs with tender succulent leaves; 

 flowers small, solitary or in leafy cymes; calyx-lobes 4 or 5, 

 yellow within; stamens 8 or 10, very short, inserted on a conspic- 

 uous disk; styles 2; capsule obcordate or 2-lobed, flattened, very 

 short, 1 -celled with 2 parietal placentae, 2-valved at the top, 

 many-seeded. 



Chrysosplenium scouleri (Hook.) Rose. (C. glechomaefolium Nutt.) 

 Perennial, glabrous; stems creeping or ascending, 5-15 cm. long, rooting at 

 the joints; flowering branches ascending, 5-10 cm. high; leaves opposite, or 

 those of the flowering stems alternate, orbicular, crenate, 5-20 mm. broad, 

 nearly sessile; flowers solitary, axillary; sepals 4 mm. long, obtuse; stamens 8. 



In muddy places in the mountains at low altitudes. 



256. TIARELLA. 



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 from the 

 ovary; petals 5, entire, small, short clawed; stamens 10; fila- 

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

 placentae parietal, becoming almost basal in fruit; ovules num- 

 erous; capsule 1-celled, 2-valved, the valves usually unequal; 

 seeds usually few. 



Leaves merely lobed. T. unifoliata. 

 Leaves trifoliolate. 



Leaflets coarsely dentate. T. trifoliata. 



Leaflets deeply lobed or cleft. T. laciniata. 



Tiarella unifoliata Hook. Pubescent throughout or nearly glabrous; 

 stems simple, 15-40 cm. high, erect or ascending; radical leaves ovate or 



