386 , SAXIFRAGACEAE 



3. S. cernua L. Stems 8-19 cm. t-all, somewhat glandiilar-pubescent; leaf- 

 blades reniform in outline, 9-23 mm. wide, prominently 5-7-lobed, the lobes 

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

 thium 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 lobes 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. i- 



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 solitary 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 caude.x with 3-cleft or prominently 3-lobed blades. 



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



Petals over 2 mm. long. 



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



Petals 4.5-7 mm. long. 



Sepals oblong-lanceolate to triangular-lanceolate; hypanthium turbinate 



during anthesis. 4. M. monticola. 



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

 thesis. 5. M. caespilosa. 



1. M. adscendens (L.) Small. Plants 2.5-1 1 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-linear; 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 moim tains: Wyo. — 'Utah. Subnlp. 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. delicatula 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 

 Unear 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, glandular-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-flowered, each bearing 2 or 3 

 leaves; hypanthium 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. 



