Rydberg : Rocky Mountain flora 59 



Malvastrum digitatum Greene, Leaflets i: 154. 1905. 

 Malvastram dissectum Cockerell, Bull. Torrey Club 27: 87, mainly. 



1900. 

 Malvastrum Cockerellii A. Nels. Bot. Gaz. 34: 24. 1902. 

 Malvastrum dissectum Cockerellii A. Nels.; Coult. & Nels. New 



Man. Bot. Cent. Rocky Mts. 318. 1909. 



Sphaeralcea leptophylla (A. Gray) Rydb. 

 Malvastrum leptophyllum A. Gray, PI. Wright. 1: 17. 1852. 



Sphaeralcea arizonica Heller, sp. nov. 



Perennial with a woody caudex 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 densely stellate throughout; its 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, only about the lowest fourth reticulate. 



Differing from S. ambigua in the short calyx-lobes and the 

 narrow and dense inflorescence and from 5. marginata in the dense 

 stellate pubescence, which extends even to the calyx. 



Arizona: Flagstaff, June 16,1898, MacDougal 120 (type, in herb. 

 N. Y. Bot. Gard.) ; 30 miles east of Flagstaff, July 18, 1893. Wooton; 

 Fort Verde, May 4, 1888, Meams 225; same locality 1887, 150; Hol- 

 brook, June 18, 1901, L. F, Ward; Ash Fork, June 10, 1883, 

 Rusby 538. 



Utah: St. George, Apr. 14, 1880, M. E. Jones 1660; proposed 

 dam site, near Wilson Mesa, Grand Co., July I, 191 1, Rydberg & 

 Garrett 8386; S. Utah, 1877, Palmer; 1874, Parry 25. 



Sphaeralcea subrhomboidea Rydb. sp. nov. 



Perennial with a woody caudex, branched at the base; stems 

 stellate, 2-4 dm. high; leaf-blades rhombic in outline, 2-5 cm. 

 long, stellate but not densely so, grayish-green, cuneate at the 

 base, 5-ribbed, 3-cleft about half way down, 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; fruit depressed-globose; carpels nearly round, obtuse, 

 the lower half reticulate on the faces'; seed solitary, without 

 filiform attachment. 



