CATALOGUE. 83 



nearly glabrous above, tomentose-canescent beneath, serrately toothed toward 

 the apex, strongly nerved ; flowers solitary or 2-4 together, on slender pedi- 

 cels ; calyx-tube becoming i' in length ; tail of the fruit (4' long) densely 

 plumose. — From New Mexico northward to Wyoming Territory and west to 

 California. Found in the Wahsatch and Uinta Mountains, but not seen in 

 Nevada; 6-7,000 feet altitude; in flower and fruiting, July. (312.) 



Cercocarpus ledifolius, Nutt. Leaves j-lj' long, coriaceous, lance- 

 olate, entire, nearly veinless with a strong midnerve, margins revolute, usually 

 glabrous above and more or less tomentose beneath, somewhat fascicled ; 

 flowers 2-6 together, sessile ; calyx-tube becoming 4" long ; tail of the fruit 

 very plumose, 3' long, twisted.— An evergreen, with hard heavy dark-col- 

 ored wood, and known as "mountain mahogany;" not usually exceeding 

 10-15° in height and 6-12' in diameter, and much resembling the apple tree 

 in habit, but sometimes becoming a handsome tree 2i° through and 40° or 

 more high. It is quite variable in its. pubescence and the flowers are very 

 rarely 2-carpelled. Nuttall describes the achenium as 2-seeded ; this does 

 not appear to be the case. Frequent on mountain-sides through Nevada and 

 Utah from the Washoe Mountains to -the Wahsatch, extending into Idaho and 

 California; 6-8,000 feet altitude; June-September. (313.) 



Cercocarpus breviflorus. Gray. Plant. Wright. 2. 54. Leaves ¥ 

 long, coriaceous, spatulate-oblong or linear by the revolution of the margins, 

 entire, sessile, somewhat fascicled, silky-pub erulent on both sides or glabrous 

 above ; flowers sessile, solitary or in pairs, rather small, 2" in diameter ; 

 calyx becoming 2" long ; the plumosely-tailed fruit 1-2' in length. — A. very 

 diffuse densely and rigidly branched evergreen shrub, 1-6° high ; the leaves 

 on these specimens are strongly revolute, shining above, the branchlets almost 

 spinose. Collected by Wright near Frontera in New Mexico ; now found 

 only in the American Fork canon of the Wahsatch Mountains, Utah; 5,000 

 feet altitude. (314.) 



CowANiA^ Mexican A, X Don. (C. Stansburiana, Torr. Stans. Rej^.jp. 386, 

 t. 3.) Leaves 4-7" long, terminating the branchlets, cuneate at base and 



' COWANIA, Don. Tute of the persistent calyx turbinate ; limb 5-lobed, valvate. Petals 5, 

 obovate, spreading, exceeding tbe calyx. Stamens numeroiiB, crowded in 2 series, inserted on the mouth, 

 of the calyx ; filaments for the most part free, short, incurved. Carpels 5-12, sessile, free, villous, l-oelled ; 

 style short, villous ; ovule solitary, ascending. Achenia included in the calyx and terminated with the 

 very long plumose styles. Seed erect; testa membranous; albumen thin; cotyledons oblong; radicle 

 inferior. — ^Muoh branched shrubs, with small alternate coriaceous plicate divided leaves, margins revo- 

 lute, white-tomentose beneath, and large sessile solitary terminal flowers, Benth. & Hook. 



