670 MISC. PUBLICATION 42 3, IT. S. DEPT. OF AGRICULTURE 



1. BUMELIA 



Large shrub with spiny branches; leaves mostly fascicled on the 

 branch-lets, the blades oblanceolate- or obovate-cimeate, rusty-lanate 

 beneath; flowers small, perfect, regular, in axillary fascicles; corolla 

 white, with lobelike appendages in the sinuses; stamens 10, of these 5 

 sterile and petallike; fruit a drupe, with 1 stone. 



1. Bumelia lanuginosa (Michx.) Pers., Syn. PI. 1: 237. 1805. 



Sideroxylon lanuginosum Michx., Fl. Bor. Amer. 1: 122. 1803. 



Cochise and Pima Counties, 4,000 to 5,300 feet, forming thickets 

 along streams, June. Georgia and Florida to Illinois, Kansas, south- 

 ern Arizona, and northern Mexico. 



The Arizona form is var. rigida A. Gray (B. rigida Small), which 

 has smaller, more strongly cuneate leaves than in the typical form of 

 the species. In Arizona it is a shrub, ordinarily 2.4 to 3 m. (8 to 10 

 feet) high. The flowers are very fragrant. Gum exuded from the 

 bark is reported to be used for chewing by children in Texas. 



98. OLEACEAE. Olive family 



Trees, shrubs, or herbs, of diverse habit; leaves simple or pinnate, 

 alternate or opposite; flowers regular, perfect or unisexual, with or 

 without a corolla; stamens 2 or 4; ovary 2-celled; fruit various. 



The best-known members of this family are olive, ash, and lilac. 



Key to the genera 



1. Leaves pinnately compound or, if unifoliolate, then the blade broad, ovate, oval, 

 or suborbicular; fruit with a conspicuous, mainly terminal, flat wing. 



1. Fraxinus. 

 1. Leaves simple; fruit not winged (2). 



2. Flowers often unisexual, appearing before the leaves; corolla none or rudi- 

 mentary; fruit a 1-seeded drupe 2. Forestiera. 



2. Flowers perfect, appearing after the leaves; corolla large; fruit a membra- 

 naceous, didymous capsule with 2 to 4 seeds in each cell. 



3. Menodora. 



1. FRAXINUS. 7 Ash 



Trees or large shrubs; leaves opposite, commonly pinnate, petioled; 

 flowers in racemes or panicles, mostly unisexual, apetalous or with a 

 4-parted corolla; stamens commonly 2, with large anthers; fruit dry, 

 with a large flat terminal wing, indehiscent; seeds 1 or 2. 



Some of the North American ashes are important timber trees, but 

 the species occurring in Arizona do not grow large enough to make 

 the wood valuable. The herbage is of limited value as browse. The 

 Arizona ash (F. velutina var. glabra) is an exceptionally fine shade tree 

 and is planted extensively in dooryards and along streets in southern 

 Arizona. 



Key to the species 



1. Twigs evidently quadrangular; wing of the fruit extending nearly or quite to 

 the base of the thin, strongly compressed body; twigs and foliage glabrous 

 or glabrate (rarely decidedly pubescent in F. lowellii); corolla none; fruit 

 elliptic or obovate, obtuse or truncate and often retuse at apex (2) . 



7 Reference: Rehder, Alfred, the genus fraxinus in new mexico and Arizona. Amer. Acad. 

 Arts and Sci. Proc. 53: 199-212. 1917. 



