318 MALVACEAE (MALLOW FAMILY) 



silvery-canescent : the stems tufted, branched, and spreading, 1-2 dm. high: 

 leaves pedately 3-5-parted, 2-4 cm. in diameter, the cuneate divisions 2-3- 

 cleft: flowers short-pediceled, at first crowded but later in a loose raceme: 

 calyx-lobes lanceolate, in age incurved over the fruit: petals copper-scarlet 

 or brick-red: carpels round-reniform, reticulate-rugose, tardily and incom- 

 pletely dehiscent. The Trans-Missouri region to the mountains. 



3. Malvastrum dissectum (Nutt.) A. Nels. Bot. Gaz. 34: 25. 1902. Peren- 

 nial; many-stemmed from a multicipital caudex, 2 dm. high or less, densely 

 cinereously stellate-pubescent, the stems whitened with the closely appressed 

 hairs, the calyx obscurely glandular beneath the pubescence: leaves small, 

 1-3 cm. broad, pedately 3-5-parted, the divisions incisely lobed, the lobes 

 narrowly oblong to linear: racemes several-flowered, pedicels 2-5 mm. long; 

 flowers scarlet: the petals ob ovate, nearly truncate and merely emarginate. 

 Desert areas of Wyoming and Colorado. 



3a. Malvastrum dissectum Cockerellii A. Nels. Less hoary, the leaf seg- 

 ments broader: calyx-lobes abruptly contracted to a linear tip: ovules two in 

 each cell, but one of them abortive. M. Cockerellii A. Nels. 1. c. New Mexico. 



4. Malvastrum leptophyllum Gray, PL Wright. 1: 17. 1852. Three dm. 

 or less high from lignescent base and stock: stems very numerous, erect or 

 ascending, slender: lower leaves short-petioled and 3-parted or -divided into 

 narrow linear divisions; upper simple and sessile, mostly filiform: flowers 

 few and racemose at summit: petals copper-red, less than 12 mm. long: fruit 

 depressed-globular, slightly surpassing the triangular calyx-lobes; carpels 9 or 

 10, tomentulose, thickish and rounded on the back, sides coarsely and strongly 

 reticulated. Colorado to Texas and New Mexico. 



5. SPHAERALCEA St. Hil. GLOBE MALLOW 



Differing from Malvastrum only in the carpels being 2- or 3-seeded, or when 

 1-seeded with an empty terminal portion. 



Leaves linear-oblong to lanceolate . . . . . . . 1. S. cuspidata. 



Leaves crenate, ovate-cordate . . . . . . . . 2. S. Munroana. 



Leaves cordate and deeply 5-7-lobed . 3. S. rivularis. 



1. Sphaeralcea cuspidata (Gray) Brit. Fl. 3: 519. 1898. Densely stellate- 

 pubescent, 4-8 dm. high: leaves oblong-linear to lanceolate, usually rounded or 

 subcordate at base, crenately serrate; the lower with petioles as long as the 

 blade, the petioles shorter upward: peduncles axillary, shorter than the pet- 

 ioles, 2-several-flowered : corolla purple or red, 12-15 mm. broad: carpels 

 1-3-seeded. S. angustifolia Spach. Southern Colorado and southward. 



2. Sphaeralcea Munroana (Dougl.) Spach. Hist. Veg. 3: 353. 1834. Gray- 

 ish with a dense stellate-pubescence, branching, 3-6 dm. high: leaves ovate- 

 cordate, somewhat lobed and the lobes crenate, 3-4 cm. long, on slender 

 petioles about as long: calyx-lobes acute or acuminate: petals scarlet, obo- 

 vate, 12-20 mm. long: carpels pubescent on the back. Malvastrum Mun- 

 roanum Gray. Western Wyoming and westward. 



3. Sphaeralcea rivularis (Dougl.) Torr. in Gray, PL Fendl. 23. 1848. 

 Scabrous with stellate pubescence: stems stout, much branched, 6-12 dm. 

 high: leaves cordate, deeply 5-7-lobed, lobes acute, coarsely toothed: racemes 

 leafy below, naked above, the flowers clustered on short peduncles: lobes of 

 the calyx broadly triangular, acute or acuminate: petals 2-3 cm. long, white 

 or pale purple: carpels hirsute on the back. (S. Crandallii and S. grandiflora 

 Rydb. Bull. Torr. Bot. Club 31: 564. 1904.) Wyoming, northward, and 

 westward. 



6. ABUTILON (Tourn.) Mill. INDIAN MALLOW 



Herbs or shrubs, often tomentose or velvety, and with leaves generally cor- 

 date. Calyx naked, 5-cleft. Stigmas capitate; carpels 5 or more, 3-9-ovuled. 

 Seeds more or less reniform. 



