ROSE FAMILY 



207 



13. COWANIA Don 



. Shrubs or small trees. Leaves small, pinnately lobed, coriaceous, gland-dotted. 

 Flowers showy, solitary and terminal on the short branchlets. Calyx-tube broadly 

 clavate. Petals orbicular or obovate, spreading. Stamens numerous, in 2 rows. 

 Pistils about 5 to 10, densely villous; style terminal ; ovule solitary. Achenes coria- 

 ceous, striate, nearly included in the enlarged calyx-tube, tailed with the elongated 

 plumose style. — Species 3, Mexico and southwestern United States. (James Cowan, 

 British merchant and botanical amateur, died at Lima, 1823.) 



1. C. mexicana Don var. stansburiana Jepson. Cliff Rose. (Fig. 165.) 

 Freely branching shrub, 1 to 3 (or 6) feet high; leaves tending to be fascicled on 

 the short branchlets, 3 to 4 lines long, pinnately 3 to 5-parted into short linear lobes, 



dark green above, white-tomentose beneath, the 

 margin somewhat revolute; flowers yellow, 6 to 9 

 lines broad ; calyx-tube glandular-pubescent, at- 

 tenuate into a short pedicel; calyx-lobes round- 

 ish; tail of the achene l^/^ to 2 inches long. 



Arid mesas and canon sides, 4100 to 7500 

 feet : eastern Mohave Desert ; Inyo Co. East to 

 Utah, south to Mexico. June. 



Note on variation. — The campanulate calyx-tube of 

 Cowania mexicana Don may vary in width in the same 

 general locality (of. Durango, Palmer 12 and Palmer 71) 

 just as does the funnelform calyx-tube of the var. stans- 

 buriana (cf. Silver Canon, White Mts., J. Grinnell, Jep- 

 son 7222), while spms. from the New York Mts., eastern 

 Mohave Desert, are intermediate. Such facts indicate 

 that the northern form is more accurately designated as 

 a variety than as a species. The variety dubia Bdg., 

 rarely collected, has been thought to be a hybrid between 

 Cowania mexicana var. stansburiana and Purshia tri- 

 dentata (Zoe 5:149). 



Locs. — Silver Canon, White Mts., Jepson 7222; 

 Inyo Mts., Inyo Co., Purpus 5804; Emigrant Canon, 

 Panamint Eange, Jepson 7118 ; Hanaupah Canon, Pana- 

 mint Range, Jepson 6952; Bonanza King Mine, Provi- 

 dence Mts., Munz 4053; Barnwell, New York Mts., K. 

 Brandegee. 



Var. dubia Bdg. Flowers perfect and staminate; 

 stamens fewer ; pistils 2 or 3 ; tails of fruits short, not 

 plumose but densely hairy. — Providence Mts., e. Mohave 

 Desert. 

 Refs.— COWANU MEXICANA Don, Trans. Linn. Soc. 14:575, t. 22, figs. 1-6 (1825), type from 

 Mexico, Mocino 4- Sesse. Var. stansburiana Jepson, Man. 498 (1925). C. stansburiana Torr.; 

 Stansb. Expl. Great Salt Lake 386, pi. 3 (1852), type loc. Stansbury Isl.,_Great Salt Lake, Utah. 

 C. plicata Torr. Frem. Eep. 314 (1845), collected by Fremont, doubtless m the Great liasm; not 

 C. plicata Don (1825) . C. mexicana Gray, PL Wright. 2 :55 (1853) ; not C. mexicana Don (1825) 

 Var. DUBIA Bdg. Zoe 5:149 (1903), type loc. Providence Mts., T. Brandegee; Jepson, Man. 498 

 (1925). C. alba Goodding, Bot. Gaz. 37:55 (1904), type loc. mts, s. of Bunkerville, Nev., Good- 

 ding 744. 



14. ROSA L. KosE 

 Prickly shrubs with pinnate leaves and adnate stipules. Flowers large, ours 

 mostly rose-pink, solitary or in corymbs or panicles. Calyx-tube globose or urn- 

 shaped, becoming fleshy in fruit. Calyx-limb 5-parted. Petals 5 (rarely 6, 7 or 8) , 

 rounded or in ours mostly obcordate, spreading, inserted with the numerous sta- 

 mens on the edge of the thin disk which lines the calyx-tube within and bears toward 

 the base the numerous distinct pistils. Ovaries hairy, becoming bony achenes 

 Achenes enclosed in the globose or umshaped calyx-tube or "hip." — Species about 



Fig. 165. Cowania mexicana Don 

 var. STANSBURIANA Jepson. a, fl. 

 branchlet, X %; b, fr., X %. 



