SAXIFBAGA. S AXIFRAGACE^. 191 



Srf cherlerioides D. Don Monogr. Saxifr. 382. S. bronchialis var. 

 cherlerioides Engler. Cespitose, with many creeping branches and short 

 branchlets forming dense masses 6-18 inches in diameter: leaves spatu- 

 late, rounded or obtuse and cuspidate at the apex, finely ciliate, 1-3 lines 

 long, crowded oh the short branchlets : flowering stems 2-4 inches long ; 

 flowers white, in a loose open cyme on slender pedicels; sepals nearly dis- 

 tinct, ovate, obtuse, glabrous, a line long; petals oblong-obovate, 3- 

 nerved, thrice longer than the sepals; styles connivent in flower. On 

 rocky slopes along the Columbia river near the Cascade falls. 



S. tricuspidata Ritz. Prodr. Fl. Scand. ed. 2, 104. Stems erect, thick, 

 2-3 inches high: leaves densely imbricated below, thick-coriaceous, 3- 

 cuspidate, with cartilaginous points, the margins, very slightly ciliate: 

 flowers somewhat corymbose, on short stout pedicels; sepals ovate, some- 

 what coriaceous ; petals obovate-oblong, longer than the sepals : capsule 

 ovoid, apiculate with the conical divergent styles. Arctic America: said 

 to have been found on Mount Hood. 



2 DACTYLOIDES Tausch 1. c. Caudex perennial, leafy: 

 leaves persistent, the margins not punctate nor cartilaginous: 

 flowering stems annual, somewhat leafy : sepals united at base 

 and coherent with the base of the ovary: cilise of the leaves 

 articulated. 



S. caespitosa L. Sp. 494 (?). Cespitose, the slender running stems 

 and short branchlets forming dense tufts 6-16 inches in diameter: leaves 

 pale or yellowish, thin, pubescent, spatulate, 2 5-cleft or entire, the seg- 

 ments usually obtuse, closely imbricate on the short branchlets, persist- 

 ent, flowering stems slender, 2-6 inches high, glandular, 1-5-flowered : 

 calyx cleft to the middle, with oblong acute lobes ; petals white. 3-5 lines 

 long, oblong, 3-nerved, rounded above, twice as iong as the calyx: cap- 

 sule open only at the top the slender beaks but slightly diverging. On 

 cliffs and rocky slopes, along the Columbia river near the Cascade falls. 



S. TolmaBi T. & G. Fl. i, 567. Cespitose with leafy running diffusely 

 branching stems, forming dense tufts 4-20 inches in diameter: leaves suc- 

 culent, nearly terete when young, glabrous, sometimes sparingly ciliate 

 near the base, 4-6 lines long, clavate, obtuse, closely imbricated on the 

 slender branches, persistent: flowering stems scape-like, 2-4 inche< high, 

 1-4-flowered; sepals, ovate, 3-nerved, about 2 lines long; petals white, nar- 

 rowly lanceolate, unguiculate, 3-nerved, longer than the sepals; capsule 

 large, 4-5 lines long, ovoid, united only at the base, the. acute beaks di- 

 verging, sometimes abnormally 3-4-celled. In sand along rivulets on the 

 highest mountains near perpetual snow. Brit. Columbia to California. 



3 HYDATICA Tausch. 1. c. Caudex perennial, commonly 

 subterranean ; stems or scapes annual ; calyx nearly free from 

 the ovary ; sepals almost distinct, reflexed; filaments more or 

 less dilated upward. 



* Leaves all clustered at the crown of a ligneous more or less 

 creeping caudex. 



S Lyalli Engler Index Crit. Saxifr. 3'). Glabrous: caudex creeping and 

 sparingly branched: leaves obovate, attenuate below to a margined petiole, 

 coarsely toothed at the summit. 6-12 lines long : stems erect, slender, 6-12 

 inches high, 6-10-flowered; calyx parted nearly or quite to the base, the 

 ovate acute segments soon reflexed, 2 lines long; petals round-obovate , 

 subunguiculate, 1-nerved, but little if any longer than the sepals ; fila- 

 ments flat, broadest in the middle : capsule united only at the base, rarely 

 3-4-celled, the beaks erect. Along streams, northern Idaho to Brit. 

 Columbia and the Arctic Coast. 



