FLOWERING PLANTS AND FERNS OF ARIZONA &i 1 



■2. Leaves 1- or 3-foliolate, the single or terminal leaflet broadly ovate or 

 orbicular, truncate or short-cuneate at base, commonly obtuse or 

 retuse at apex, the margin entire to crenate: plant commonly a shrub. 



1. F. AXOMALA. 



2. Leaves 3-, 5-, or 7-foliolate: leaflets elliptic or ovate, the terminal one usually 



obovate, cuneate at base, the margin crenate-serrate: plant a small tree. 



2. F. LOWELLII. 

 1. Twigs terete or rounded-quadrangular: wing of the fruit subterminal, not 



extending nearly to the base of the body, except sometimes in F. ma- 

 cropetala (3). 



3. Corolla present, 4-parted, white, 10 to 15 mm. long: body of the fruit thin, 



strongly compressed: leaflets not more than 4 cm. long, lanceolate to 

 broadly ovate, acutish to acuminate or sometimes obtuse or emarginate, 

 the margin entire or nearly so: fruit spatulate-oblong or oblong-lanceo- 

 late, the wing obtuse or truncate and often emarginate at apex. 



3. F. MACROPETALA. 



3. Corolla none: body of the fruit thick, more or less terete: leaflets commonly 

 5 or more (4) . 

 4. Old leaves persistent until the flowers appear: rachis narrowly winged; 

 leaflets not more, usually much less, than 4 cm. long, coriaceous, 

 sessile, oblanceolate, narrowly obovate, or elliptic, obtuse or acutish 

 at apex, inconspicuously crenate or dentate, commonly 5: plant a 

 shrub or small tree, glabrous or nearly so: wing of the fruit narrowly 

 elliptic or oblanceolate, much longer than the thick body. 



4. F. GREOOII. 

 4. Old leaves deciduous before the flowers appear: rachis not winged; leaflets 

 commonly more than 4 cm. long, lanceolate to ovate, mostly acuminate 

 and serrulate or serrate: plants normally small trees. 



5. F. VELUTIXA. 



1. Fraxinus anomala Torr. ex S. YTat<. in Kins:, Geol. Expl. 40th 



Par. 5: 283. 1871. 



Apache County to Coconino County, 2,000 to 6,000 feet, especially 

 common in the Grand Canyon, April. Western Colorado and Xew 

 Mexico to northern Arizona and southeastern California. 



Singleleaf ash. A shrub, sometimes 6 m. (20 feet) high. 



2. Fraxinus lowellii Sars;. ex Render, Amer. Acad. Arts and Sci. Proc. 



53:211. 1917. 



Southern Coconino County and eastern Mohave County to western 

 Gila and eastern Maricopa Counties (perhaps also in the Santa Rita 

 Mountains, Pima County). 3,200 to 6.500 feet, mostly along streams, 

 March, type from Oak Creek Canyon (Rehder 53). Known only 

 from Arizona. 



Lowell ash, commonlv shrubby, reaching a height of at least 7.5 m. 

 (25 feet). 



3. Fraxinus macropetala Eastw., Torrey Bot Club Bui. 30: 494. 1903. 



Fraxinus cuspidata Torr. var. macropetala Rehder, Amer. 

 Acad. Arts and Sci. Proc. 53: 201. 1917. 



Coconino County, chiefly in and near the Grand Canyon, May and 

 June, type from the Grand Canyon (Wooton 1102). Known only 

 from Arizona. 



Flowering ash, the only species in Arizona having a corolla. The 

 flowers are fragrant. The plant is commonly a large shrub with 

 1- to 5-foliolate leaves. 



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