179 



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

 point; smooth ami green both sides, but with fine, close clown on nudrib below. 

 JSeeds 1 to 1| inches long, i to ^ (conniionly i) of an inch wide, slender and sharp- 

 pointed at the bas»^, broadening into a lance-shaped or siiatulate wing above ; ridged 

 Branches round. Young seedlings smooth and straight. 



: BIGXO^flA FAMILY. 



Gl. — ''Desert Willow." (Chilopsis saWjna^ D. Don.) 



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

 diameter, growing oul^^ near water, and preferring a light sand}^ soil. 

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

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

 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. 



Dcscr/i^fio??. —Leaves alternate, H to 5| inches long, commonly less than i inch NVide ; 

 linear to liuear-lauce-shai)ed, usually tapering to a very slender point at either end. 

 Flowers large, (2 inches long) w^hite or purplish. The seeds are borne in a long 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. 



UETICAOE^ : 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 Eocky 

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

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

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

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

 often very difficult to split j 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 i)revent 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 — i)eculiar to elms); 

 nuirgin 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, i^roducing low 

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

 and the trunk tall and straight. 



