179 



margin entire, with acute or blunt teetli, or sometimes with teeth only near the 

 X^oint; smooth and green both sides, but with line, close down on midrib below. 

 Seeds 1 to If inches long, i to ^ (counnouly i) of an inch wide, slender and sharp- 

 pointed at the base, broadening into a lauce-shaped or spatulate wiug above ; ridged 

 Branches round. Youug seedlings smooth sxixd straight. 



BIGNONIACE^ : BIGNONIA FAMILY. 



61.— "Desert Willow." (Chilojms salignaj D. Don.) 



A small slirub or tree, 10 to 25 feet in height and 4 to 10 inches in 

 diameter, growing onl}^ near water, and preferring a light sandy soil. 

 It occurs through southern Arizona and Kew Mexico (west into south- 

 ern California, east into Texas, south into northern Mexico). Tlie 

 wood is light, soft, and much like that of the Black Walnut, but lighter, 

 and very suitable for cabinet-work, though large trees are apt to be 

 hollow and useless for lumber. 



DescHj^tion.— heaves alternate, 1^ to 5^ inches long, commonly less than i Jucli NTide; 

 linear to linear-lance-shaped, usually tapering to a very slender point at either end. 

 Flowers large, (2 inches long) white or purplish. The seeds are borne in a ioog slen- 

 der pod (like the Catalpa bean), 6 to 12 inches long ; seeds small, flat, ajid with a thin 

 brush of whitish wool at each end. 



UETICACE^ : KETTLE FAMILY. 



62.— White Elm. American Elm. Water Elm. (Ulmus Ameri- 

 cana. Linn.) 



A large tree, attaining a height sometimes of over 100 feet, with a 

 diameter of 4 to 6 feet. It occurs sparingly in the northwestern Kocky 

 Mountain region (but has an extended range east of the Eockies to the 

 Atlantic and somewhat north of the United States boundary); very 

 adaptive to different soils, but preferring moist bottom-lands, where it 

 reaches its largest size. The wood is heavy, rather hard, and tough, 

 often very difficult to split; in its eastern range used considerably for 

 coarse lumber, flooring, staves, wheel-stock, and fuel. When employed 

 for lumber, it requires care in seasoning to prevent it from warping 

 badly. Often used as an ornamental tree. 



Description. — Leaves 2 to 4 inches long, oval or oblong (broader above), tapering 

 suddenly to a short, narrow point; base rounded (unequal-sided— peculiar to elms); 

 margin sharply cut with teeth of two sizes; smooth above, hairy below, though often 

 becoming smooth. Fruit {samara, \ inch long) with thin wing all around, borne on 

 drooping stems in small clusters; ovate, with a notch at the apex closed by two in- 

 curved teeth ; margin of the wing with hair-like fringe. Branchlets and buds smooth. 

 Large tree, with thick, grayish, and deeply furrowed bark ; with room, producing low 

 trunk, and a broad, much-branched crown; closely grown, the latter is contracted 

 and the trunk tall and straight. 



