OF THE WASATCH REGION 43 



1. 1*. demissa Walpers. (P. melanocarpa Rydb.) Wild 

 Cherry; Choke Cherry. Shrub or small tree, 10-16 ft. high. 

 Leaves finely serrate with the teeth incurved or appressed; 

 smooth or nearly so on both sides; petioles without glands. 

 Racemes compact; erect or ascending. Flowers rather 

 fragrant. Fruit red when immature, black when fully ripe. 

 Along streams. May-June. 



4. COWANIA. Cliff Rose. 



Much-branched scrubby shrubs with shreddy bark. Leaves 

 fascicled, leathery, glandular-dotted, wedge-shaped, persistent 

 throughout the winter. Flowers solitary and terminal on 

 short, lateral branches; short-peduncled. Petals 5; yellow or 

 cream-colored. Stamens numerous, in 2 rows. Carpels 5-12; 

 their fruiting styles 1-2 inches long, plumose with long hairs. 

 Fruit an achene. 



1. C. Mexicana Don. Shrub 1-8 ft. high. Leaves dark-green 

 above, white-tomentose beneath; y 2 inch long or less; apex 

 pinnately 1-3-lobed or parted and margins 2-4-divided. Sti- 

 pules persistent. Calyx-tube narrowed into a short glandular- 

 hairy pedicel. Body of the 3-sided achene nearly included 

 within the dilated calyx-tube. Mountain-sides. May-June. 



5. PHYSOCAIiPUS. (Opulaster.) Nine-Bark. 



Bushy unarmed shrubs, 2-6 ft. high, with grayish or red- 

 dish-brown shreddy bark. Leaves simple, palrnately lobed with 

 large, deciduous stipules. Inflorescence corymbose. Flowers 

 white, showy, fragrant. Calyx 5-cleft, persistent. Corolla 

 regular, of 5 obovate petals. Stamens numerous. Pistils 1-5 

 (mostly 3), more or less united toward the base; ripening into 

 2-seeded follicles that dehisce along both sutures. 



1. P. pauciflorus (T. & G.) Piper. (P. malvaceus (Greene) 

 A. Nels. ; Spiraea opulifolia pauciflora T. & G.; O. pauciflorus 

 (T. & G.) Heller.) 3-6 ft. high; with rounded, 3-lobed leaves, 

 which are stellate-pubescent on lower surface near the base. 

 Carpels 2; pubescent; not longer than calyx. Mountain-sides 

 in rich soil. June-July. 



6. RUBUS. Raspberry; Blackberry; Bramble. 



Erect or climbing perennial shrubs (or a few species herbs), 

 often armed with curved prickles. Leaves alternate; simple 

 and palmately-lobed or compound; with stipules adnate to the 

 petiole. Flowers perfect or rarely dioecious. Calyx without 

 bracts; persistent, deeply 5-parted. Petals deciduous. Stamens 

 numerous; distinct. Carpels numerous, on a convex or a nar- 

 row and elongated cylindrical receptacle; becoming in fruit 

 an aggregation of small stone-fruits. 



Unarmed; leaves simple 1. R. parviflorus 



Armed with hooks or bristles; leaves compound. 



Sepals^ as long as petals; fruit red 2. R. Idaeut* 



Sepal's usually longer than petals; fruit usually 



black . 3. R. leucodermlM 



