560 MALVACEAE 



1. S. cuspidata Torr. Perennial, with a woody base; stem 3-10 dm. high, 

 stellate-pubescent; leaf -blades lanceolate or linear-lanceolate, crenulate, 5-10 cm. 

 long, sometimes hastate ly lobed at the base; flowers axillary; sepals ovate, acute; 

 petals pink, 6-8 mm. long; carpels 5-6 mm. long, strongly rugose at the base. 

 Plains: Tex. Kans. Colo. Ariz.; n Mex. Son. Ap-Au. 



2. S. angustifolia (Cav.) Don. Perennial, with a somewhat woody base; 

 stem 5-15 dm. high, leafy, subcanescent ; leaf -blades 5-12 cm. long, lanceolate or 

 linear-oblong, crenate, the lower sometimes hastately lobed; flowers clustered in 

 the axils; sepals lanceolate or ovate-lanceolate, acute or short-acuminate; petals 

 pink, 8-10 mm. long; carpels 5-6 mm. long, only the lower fourth or less rugose. 

 Plains and dry places : Tex. Colo. Utah Ariz. ; Mex. Son. Submont. Ap-Au. 



3. S. caespitosa M. E. Jones. Caespitose, with a thick woody root and 

 caudex; stem 5-15 cm. high, rarely higher, densely stellate; leaves rhombic- 

 ovate or -obovate, 2-3.5 cm. long, coarsely serrate, thick, densely white-stellate; 

 calyx sharply angled; lobes triangular; corolla red, fully 2 cmf long; fruit de- 

 pressed-globose; carpels 2-seeded. Volcanic soil: w Utah. Son. Je. 



4. S. ambigua A. Gray. Perennial, woody at the base; stem 3-10 dm. 

 high, tomentulose-canescent; leaf -blades rounded-cordate or orbicular, often 

 obscurely 3-5-lobed, irregularly crenate; inflorescence racemiform; calyx densely 

 stellate, its lobes lanceolate, 8-10 mm. long; petals rose-colored or white, 1-2 cm. 

 long; carpels about 6 mm. long, cuspidate -acuminate. Desert regions: Ariz. 

 s Utah Calif. L. Calif. L. Son. Mr-Je. . 



5. S. Munroana (Dougl.) Spach. Perennial, with a woody root; stem leafy, 

 3-6 dm. high, minutely canescent; leaf -blades rounded-cordate, more or less 

 distinctly 3-5-lobed, coarsely toothed; inflorescence thyrsoid-glomerate ; calyx 

 densely stellate, its lobes ovate, acute; petals scarlet to rose-red, about 1 cm. 

 long; carpels about 3 mm. long, merely acutish above. Malvastrum Munroanum 

 A. Gray. Dry plains: B.C. Ida. Utah Ore. My-Je. 



6. S. marginata York. Perennial; stem usually branching from the base, 

 2-6 dm. tall, densely stellate-canescent ; leaf -blades subrotund, rounded-ovate 

 or subcordate, 1.5-4 cm. long, crenate, slightly 3-5-lobed, densely stellate; 

 flowers borne in narrow panicles; calyx-lobes ovate, acute, or acuminate, in fruit 

 45 mm. long; petals pink, obovate, 10-12 mm. long; carpels 3-4 mm. long, cus- 



idate, the lower half reticulate. Dry places: Colo. Utah N.M. Son. 

 ubmont. My-Je. 



7. S. arizonica Heller. Perennial, with a woody caudex; stem branching 

 from the base; leaf-blades reniform to cordate, 3-5 cm. long, densely stellate on 

 both sides, obscurely lobed and crenate; inflorescence paniculate, dense, with 

 short branches; calyx-lobes ovate, acute, about 3 mm. long; petals pink, about 

 1 cm. long; carpels about 4 mm. long and 1.5 mm. wide, mucronate or short- 

 cuspidate, oblong, with only about the lowest fourth reticulate. Desert regions: 

 Ariz. s Utah. L. Son. Ap-Je. 



8. S. subrhomboidea Rydb. Perennial, with a woody caudex; stems 

 branched at the base, stellate, 2-4 dm. high; leaf -blades rhombic in outline, 

 2-5 cm. long, grayish green, cuneate at the base, 5-ribbed, the divisions 2-4- 

 lobed; inflorescence a dense virgate panicle; calyx densely stellate, 4-5 mm. long; 

 lobes broadly ovate, obtusish; corolla scarlet, 8-9 mm. long; carpels nearly round, 

 obtuse, the lower half reticulate on the faces; seeds solitary. Valleys: Utah. 

 Mont. Jl-Au. 



9. S. Rusbyi A. Gray. Perennial, with a woody caudex; stems 4-6 dm. 

 high, glabrous or sparingly stellate, often tinged with purple; leaf -blades reni- 

 form in outline, 2-3.5 cm. broad, 5-divided to the base; divisions obovate, cleft 

 into oblong or linear lobes; flowers in a narrow, virgate panicle; calyx 7-8 mm. 

 long, stellate; lobes lanceolate, acute; corolla scarlet, 15-18 mm. long; carpels 

 mucronate, only the basal one-third reticulate on the faces. Dry places: Ariz. 

 Utah. Son. My. 



10. S. grossulariaefolia (H. & A.) Rydb. Perennial, with a woody caudex; 

 stem 2-6 dm. high; leaf -blades cordate in outline, stellate-canescent, deeply 3-5- 



