386 SAXIFRAGACEAE 



3. S. cernua L. Stems 8-19 cm. tall, somewhat gla.ndxilal--pubescent; leaf- 

 blades reniform in outUne, 9-23 mm. wide, prominentlj' .5-7-lobed, the lobes 

 linear to triangular-lanceolate; upper stem-leaves with 3-5-lobed blades; hypan- 

 thivun 3.5-5 mm. long at maturity; sepals oblong to oblong-lanceolate, 3-4.5 

 mm. long; petals cuneate, 6-8 mm. long. Wet rocks: Greenl. — Lab.^N.M. — ■ 

 Utah — Alaska; Eurasia. Alp. — Subalp. Je-Jl. 



4. S. simulata Small. Stems 9-22 cm. tall, sparingly glandular-pubescent; 

 leaf-blades reniform or orbicular-reniform in outline, 8-21 mm. wide, 5-7-lobed, 

 the lolses much broader than long; upper stem-leaves with 3-5-lobed blades; 

 sepals oblong-ovate, 3-3.5 mm. long; petals fiddle-shaped, 6-7 mm. long. Wet 

 rocks: Black Hills, S.D.— Colo. Mont.— Alp. Jl. 



17. MUSCARIA Haw. Saxifrage. 



Perennial caulescent matted herbs, with copiously leafy caudices and spar- 

 ingly leafy flower-stalks. Leaves alternate; blades 3-lobed, or rarely 5-7-lobed, 

 narrowed at the base. Flowers sohtary- or few in terminal cymes. Hypanthium 

 turbinate or campanulate, longer than the calyx, at least at maturity. Sepals 

 5, erect. Corolla white, regular. Petals 5, relatively broad, clawless. Stamens 

 10; filaments subulate. Ovary about one-half inferior, the carpels united to 

 above the middle. Folhcles erect, the tips sometimes slightly spreading. 



Leaves of the caudex with entire or slightly 3-toothed blades. 1. M. adscendens. 

 Leaves of the caudex with 3-cleft or prominently 3-lobed blades. 



Petals less than 2 mm. long. 2. M. micropelala. 



Petals over 2 mm. long. , , , ,. 



Petals 2. .5-3. .5 mm. long. 3. M. dehcatula. 

 Petals 4.5-7 mm. long. 



Sepals oblong-lanceolate to triangular-lanceolate; hypanthium turbmate 



diu-ing anthesis. 4. M. monticola. 

 Sepals broadly ovate to half-orbicular; hypantliimn campanulate during an- 

 thesis. 3. M. caespitosa. 



1. M. adscendens (L.) Small. Plants 2.5-11 cm. tall, somewhat glandular- 

 pubescent; leaf-blades 3-8 mm. long, mainly cuneate to spatulate, 3-toothed, or 

 those on the flower stalks sometimes entire; sepals ovate or oblong-ovate, 1.5-2.5 

 mm. long; petals cuneate to oblong-cuneate, 3-3.5 mm. long. Saxifraga adscen- 

 dens L. S. oregonensis (Raf.) A. Nels. Wet rocks: Alta. — Colo.— Utah— 

 B.C.; Eu. Alp.— Mont. Jl-Au. 



2. M. micropetala Small. Plants 2-6 cm. tall, rather copiously glandular- 

 pubescent; leaves compactly crowded on the caudices, 5-9 mm. long, 3-lobed at 

 the apex, the lobes hnear or oblong-hnear; flower stalks 1-3-flowered, each bear- 

 ing 2 or 3 leaves; hypanthium about 3 mm. long at maturity; sepals broadly 

 ovate, about 2 mm. long; petals oval or oval-obovate, about 1.5 mm. long. R. 

 micropetala Fedde. High mountains: Wyo. — Utah. Subalp. Jl-Au. 



3. M. delicatula Small. Plants 1-3.5 cm. tall, sparingly glandular-pubes- 

 cent; leaves crowded on the caudices, 5-16 mm. long, 3-lobed at the apex, the 

 lobes lanceolate to oblong or linear; flower-stalks slender, 1-2-flowered, each 

 bearing 1 or 2 leaves; hypanthium 2-2.5 mm. long at maturity; sepals oblong 

 to oblong-lanceolate, 2-2.5 mm. long, obtuse; petals oblong, 2.5-4 mm. long. 

 S. ddicalula Fedde. High mountains: Alta.— Colo.— Utah— B.C. Alp.— Mont. 

 Jl-Au. 



- 4. M. monticola Small. Plants 4.5-16 cm. tall, finely glandular-pubescent; 

 leaves crowded on the caudices, 7-18 mm. long, 3-lobed at the apex, the lobes 

 hnear to oblong-ovate, acute; flower-stalks slender, 3-5-flowered, each bearing 

 1 to 3 leaves; hypanthium 3.5-4 mm. long at maturity; sepals 2-2.5 mm. long; 

 petals obovate, about 4-5 mm. long. Saxifraga exarata Hook. S. monticola 

 Fedde. Mountains: B.C.— Mont.— Alta. Subalp. Jl-Au. 



5. M. caespitosa (L.) Haw. Plants 5-16 cm. tall, elandular-pubescent; 

 leaves crowded on the caudices; blades 8-17 mm. long, 3-lobed at the apex, the 

 lobes lanceolate or linear; flower-stalks 3-few-flowcred, each bearing 2 or 3 

 leaves; hypantliium 3.5-4.5 mm. long at maturity; sepals 2-3.5 mm. long; petals 

 narrowly obovate or oblong-obovate, 5-7 mm. long. Saxifraga caespitosa L. 



