318 MALVACEAE (MALLOW FAMILY) 



sflvery-canescent: the stems tufted, branched, and spreading, l-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 appreseed 

 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 obovate, 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, PI. 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 hnear 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 i9 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 

 l-seeded with an empty terminal portion. 



Leaves linear-oblong to laqceolate , , 1. S. cuspidatajL 



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



Leaves cordate and deeply 5-7-Iobed , , , . , . . 3, S. rivularis. 



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

 pubescent, 4-8 dm. high: leaves oblong-linear to lanceolatCj usually roimded or 

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

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

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

 1-3-seeded. S. angitstifolia Spach. — Southern Colorado and southward. 



2. Sphaeralcea Munroana (Dougl.) Spa«h. Hist. Veg. 3: 353. 1834. Gray- 

 ish with a dense steUate-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. grandifhra 

 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, 3-9-6vuled. 

 Seeds more or less reniform. ; ;« 



