128 SAXIFRAGACEAE. 



Saxifraga mertensiana Bong. Leaves nearly all basal, the blades orbic- 

 iil'.ir-nniform, incisclv manv lobed, the lobes mostly 3-toothed at apex; stems 

 10-30 cm. high; panicle loose, the branches flowering at the tips and usually 

 bearing bulbtets below; sepals reflexed; petals white, oblong or obovate, 

 Bhort-clawed; filaments broadest at top. On moist cliffs, especially in the 

 mountains. 



Saxifraga odontoloma Piper. Glabrous or nearly so; leaves orbicular- 

 reniform, deeply cordate, coarsely and equally toothed, rather thick, long- 

 petioled; scapes 10-30 cm. high; inflorescence corymbose, often loose, not 

 bulblet-bearing; sepals reflexed; petals white, obovate; filaments broadestjat 

 top. Along streams in the Blue Mountains. 



Saxifraga saximontana E. Nelson. Stems slender, erect, 20-30 cm. high, 

 glandular; leaves all basal, oblong-ovate, dentate or crenate, glabrous except 

 the margins, the petioles short and broad; inflorescence a loose much branched 

 cyme; sepals reflexed; petals white, broadly oval to ovate or obovate, short- 

 cLiwed. On moist rock cliffs, along the Clearwater, Idaho. 



Saxifraga fragosa Suksdorf. Erect, more or less viscid-glandular; leaves 

 all basal, broadly ovate, entire or minutely denticulate, 3-8 cm. long, short - 

 petioled; scapes 10-30 cm. high, usually solitary; inflorescence a rather loose 

 pyramidal cyme; calyx-lobes erect, longer than the tube; petals obovate, 

 obtuse, white, 3-3.5 cm. long. On moist banks. 



Saxifraga columbiana Piper. Erect, somewhat viscid-pubescent through- 

 out, 30-40 cm. high; leaves all radical, ovate or lanceolate, obtuse, petioled, 

 entire or nearly so, the blades 2-4 cm. long; inflorescence a narrow pyramidal 

 branched cyme; flowers greenish, 5-6 mm. in diameter; calyx-lobes triangular- 

 ovate, obtuse, longer than the short tube, becoming reflexed; petals narrowly 

 obovate, shorter than the calyx-lobes; stamens very short; ovary disk-like, 

 crenate on the edges, half-inferior. Springy places, common. 



Saxifraga plantaginea Small. Similar to S. columbiana but stouter; 

 leaves mostly oval, broad; petals obovate. Spokane, Sandberg and Leiberg. 



180. MITELLA. Mitrewort. 



Low slender perennial herbs; leaves simple, mostly radical, 

 long-petioled, ovate or orbicular; cauline rarely few, usually 

 none; 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, pinnatifid or 3-cleft 

 into thread-like lobes; stamens 10 or 5, very short; styles 2, 

 short; ovary globose, 1 -celled, with 2 parietal almost basal 

 placentae, partly superior; capsule globular or depressed, hardly 

 at all lobed : seeds several to each placenta. 



nuns opposite the pinnatifid green petals. M. pentandra. 

 Stamens alternate with the petals. 



Calyx green; petals pinnatifid. M. caulescens. 



Calyx white; petals 3-parted. M. stauropetala, 



Mitella pentandra Hook. Scapes 10-30 cm. high, puberulent; leaves all 

 basal, broadly cordate, coarsely crenate, sparsely pubescent, petioled; raceme 

 loose; calyx saucer-shaped, the lobes short and obtuse; petals pinnately divided 

 into 7-9 filiform lobes. In moist woods in the mountains. 



