. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. 780 The Bumelias 5. ARIZONA BUCKTHORN —BumeUa rigida (A. Gray) SmaU Bumelia lanuginosa rigida A. Gray A small tree occurring along streams from western Texas to Arizona and adjacent Mexico, reaching a maximum height of meters. The trunk is short, its branches are stifiF, spreading and very spiny. The bark is fissured into long, flaky red- brown ridges. The twigs are stout, rough and dark gray. The leaves are thick and
. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. 780 The Bumelias 5. ARIZONA BUCKTHORN —BumeUa rigida (A. Gray) SmaU Bumelia lanuginosa rigida A. Gray A small tree occurring along streams from western Texas to Arizona and adjacent Mexico, reaching a maximum height of meters. The trunk is short, its branches are stifiF, spreading and very spiny. The bark is fissured into long, flaky red- brown ridges. The twigs are stout, rough and dark gray. The leaves are thick and leathery, varying from wedge-shaped to nearly oblong, to 3 cm. long, rounded or notched at the apex, gradually or abruptly tapering at the base, somewhat revolute on the margin, dark green and smooth above, woolly beneath, the leaf-stalk i to 3 mm. long. The flowers are in rather few- flowered fascicles, on pedicels 4 to 8 mm. long; the calyx-lobes Fig. 711. — Arizona Buckthorn. 1 are suborbicular, 2 mm. long, the corolla-lobes suborbicular, 2 mm. broad and irregularly toothed, the ap- pendages lanceolate to ovate-lanceolate and sharp-pointed; staminodes ovate-lan- ceolate, irregularly toothed and blunt; stamens shorter than the corolla; ovary hairy. The fruit is oblong-oval or oval, 10 to 12 mm. long, black, often tipped with the persistent style. The wood is hard, very close-grained, light brown, sometimes yellowish; its specific gravity is about 6. Woolly buckthorn—BumeUa lanuginosa (Michaux)Persoon Sideroxylon lanuginosum Michaux This, the largest species of its genus, grows in sandy woods and thickets from southern Illinois and Kansas to Georgia, northern Florida and Texas; it reaches its greatest size, 20 meters tall, with a trunk diameter up to i m., in eastern Texas, but is usually much smaller and sometimes shrubby. It is also called Gum elastic. Black haw, Shittimwood, and Chittimwood. The trunk is straight, its branches short, straight, and stif
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