FLOWERING PLANTS AND FERNS OF ARIZONA 409 



20. SAXGUISORBA. Burxet 



Plant herbaceous, biennial; leaves pinnate, the divisions pinnatifid; 

 flowers perfect or unisexual, small, in dense cylindric terminal spikes; 

 sepals 4; petals none; hypanthium turbinate, 4-winged in fruit, enclos- 

 ing the solitary achene. 



1. Sangnisorba occidentalis Xutt. ex Torr. and Gray, Fl. North Amer. 

 1:429. 1840. 

 On a hillside near Superior, Pinal County {Harrison 1877;. also 

 reported by Mrs. Collom as occurring near Globe and at the eastern 

 base of the Mazatzal Mountains (Gila County ). Montana to British 

 Columbia, Arizona, and California. 



21. ROSA. Rose 



Shrubs with prickly (and often also bristly) stems; leaves alternate, 

 odd-pinnate, with conspicuous stipules adnate to the petioles; flowers 

 large and showy, fragrant, solitary or in few-flowered clusters; petals 

 broad, pink; stamens numerous, inserted on an annular disk in the 

 hypanthium, the latter globose or ellipsoid, often constricted below 

 the throat, enclosing, but not adhering to, the numerous pistils, 

 berrylike and usually bright red at maturity. 



The plants are browsed. They probably have some value in con- 

 trolling soil erosion where they form thickets, but this is seldom the 

 case in Arizona. The fruits are much eaten by birds and other ani- 

 mals. Like nearly all species of this genus, those of Arizona are 

 beautiful in flower and fruit. 



Erlanson 60 gives B. iendleri, B. neomexicana, and B. arizonica as 

 synonyms of B. woodsii Lindl. 



Key to the species 



1. Leaflets wedge-shaped, coarsely toothed at and near the apex, commonly less 

 than 1 cm. long, nearly as wide as long; stems stellate-tomentose when 

 young, the older ones with numerous long, nearly straight prickles, com- 

 monly also bristly; flowers solitary, bractless 1. R. stellata. 



1. Leaflets not wedge-shaped, but often cuneate at base, toothed well below the 



apex, commonly more than 1 cm. long, distinctly longer than wide; stems 



not stellate-tomentose; inflorescence commonly of 2 or more flowers and 



bracteate (2). 



2. Prickles of the stem straight or nearly so, normally very slender; hypanthium 



globose or nearly so 2. R. fexdleri. 



2. Prickles mostly recurved, normally rather stout (3). 



3. Hypanthium ellipsoid, noticeably longer than wide, strongly constricted 



below the calyx lobes 3. R. neomexicana. 



3. Hypanthium globose or nearly so, not strongly constricted below the 

 calyx lobes (4). 



4. Leaflets glabrous on both faces 4. R. manca. 



4. Leaflets puberulent and more or less granuliferous beneath. 



o. R. ARIZONICA. 



1. Rosa stellata Wooton, Torrey Bot. Club Bui. 25: 152. 1898. 



Powells Plateau, Grand Canyon, Coconino County, '"in a dry rocky 

 situation" (Ferriss in 1908). Western Texas, southern New Mexico, 

 and northern Arizona. 



The specimen cited belongs unquestionably to this very well- 

 marked species, but the extension of range is extraordinary. 



60 Erlanson, Eileen Whitehead, experimental data for a revision of the north American 

 wild roses. Bot . Gaz. 96 : 197-259. 1934. (See pp. 2.51-252.) 



