388 SAXIFRAGACEAE 



3. M. columbiana (Piper) Small. Leaves 2-10 cm. long, oblong to elliptic, 

 varying to ovate, shallowly undulate or denticulate, glabrous or nearly so on 

 both sides; scapes erect, 1-3.5 dm. tall, rather copiously glandular-pubescent 

 throughout; sepals ovate to oblong; petals 1.4-2 mm. long. S. columbiana 

 Piper. Slopes: Wash. Ida. -Mont. -Ore. Submont. Ap-Je. 



4. M. rhomboidea (Greene) Small. Leaves 2-6 cm. long, ovate or rhombic- 

 ovate, sometimes oblong-ovate, obtuse, crenate or dentate-serrate, nearly gla- 

 brous except the ciliate margins; scapes erect, 8-30 cm. high, glandular-pubes- 

 cent; sepals ovate to triangular, 1.5-3.5 mm. long; petals white, obovate to 

 oblong-obovate, 2.5-4 mm. long, commonly notched at the apex. S. nivalis 

 Am. auth., not L. S. rhomboidea Greene. Among rocks: Mont. Wyo. N. M. 

 Mont. Alp. My- Au. 



5. M. austrina (A. Nels.) Rydb. Leaf-blades 3-5 cm. long, ovate, elliptic, 

 or rhomboid-ovate, crenate or entire; scape 1-3 dm. high, glandular-pubescent; 

 sepals rounded, at apex, as long as the hypanthium; petals clawed; blades rounded- 

 obovate, 2-3 mm. long; tips of the follicles strongly divaricate. S. austrina A. 

 Nels. Damp soil: Colo. Mont. Je-Jl. 



6. M. Greenei Blankinship. Leaves 2-6 cm. long, ovate to oblong-ovate, 

 or oval-oblong, crenate, obtuse at the apex, ciliolate or sometimes almost gla- 

 brous; scapes erect, solitary, glandular-pubescent throughout; sepals 1-2 mm. 

 long, reflexed, ovate; petals white, 2-3 mm. long, ovate, oval, or obovate. High 

 mountains: Mont. Utah Nev. Mont. Je-Jl. 



7. M. arnoglossa (Greene) Small. Leaves 6^19 cm. long, oblong to elliptic, 

 sometimes narrowly so, remotely glandular-denticulate, ciliolate; scapes erect, 

 30-70 cm. tall, stout, glandular-pubescent, rather widely paniculate above; 

 sepals broadly ovate to deltoid, 1.5-3 mm. long, eciliate; petals white, mainly 

 oblong to elliptic, 3-3.5 mm. long. S. arnoglossa Greene. Hills and mountains: 

 Mont. Ida. Colo. Submont. Subalp. Je-Au. 



8. M. oregana (Howell) Small. Leaves 3-11 cm. long, oblong or elliptic, 

 crenulate or minutely glandular-denticulate, glabrous except the ciliolate mar- 

 gins; scape 3-10 dm. high, densely glandular-pubescent, paniculate above; 

 sepals ovate to semi-orbicular, about 2 mm. long; petals white, oval, 3.5-4 mm. 

 long, clawless. S. oregana Howell. Wet places: Wash. 'Ida. Calif. Sub- 

 mont. My-Jl. 



9. M. brachypus Small. Leaves spreading, 6-13 cm. long, oblong to 

 elliptic, remotely glandular-denticulate, the margins ciliolate; scapes solitary, 

 2-4 dm. tall, sparingly glandular-pubescent; sepals ovate, 1.5-2 mm. long, 

 eciliate; petals white, oblong or nearly so, 3-3.5 mm. long, clawless. S. brachypus 

 Fedde. High mountains: Colo. Nev. Alp. Subalp. Jl-Au. 



10. M. montanensis Small. Leaves erect or ascending, 3.5-14 cm. long, 

 often ovoid-oval, narrowly oblong-lanceolate and spatulate on the same plant, 

 entire or glandular-denticulate, often sparingly pubescent; scapes erect, stout, 

 25-60 cm. tall, finely glandular-pubescent throughout, paniculate above; sepals 

 ovate to triangular-ovate, 1-2 mm. long; petals greenish, nearly oblong or elliptic, 

 1-2.5 mm. long, clawless. S. montanensis Small. Mountains: Mont. Mont. Je. 



11. M. subapetala (E. Nels.) Small. Leaves 3-17 cm. long, narrowly oblong 

 to oblong-spatulate, the early ones relatively shorter and broader, all undulate 



or remotely glandular-toothed, ciliolate; scapes erect, 28-50 cm. tall, thinly 

 glandular-pubescent, narrowly paniculate above; sepals ovate, 1-2 mm. long; 

 petals wanting or minute, oval, white or red-tinged. S. subapetala E. Nels. 

 Wet slopes: Mont. Wyo. Ida. Mont. Alp. Je-Au. 



12. M. Lyallii (Engler) Small. Leaves 1.5-6.5 cm. long, flabellate. varying 

 to suborbicular, cuneate at the base, coarsely few-toothed above, glabrous or 

 nearly so, the petiole-like bases of ten longer than the blades ; scapes 8-36 cm. tall, 

 glabrous or nearly so; cymules very few-flowered, or flowers solitary; sepals ovate 

 to oblong-ovate, 1.5-3 mm. long, glabrous, reflexed; petals white, with 2 yellow 

 blotches below the middle, 3-4.5 mm. long, broadly oblong to suborbicular S. 

 Lyallii Engler. Along brooks: Alaska Alta. 'Mont. B.C. Subalp. Jl-S. 



