. 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. Howell's Thorn 475 calyx-lobes triangular; stamens about 20; anthers red; styles 3 to 5. The fruit ripens late; it is globose to subglobose, red, 4 to 6 mm. thick, calyx-lobes reflexed; flesh dry and mealy; it contains 3 to 5 nutlets, 3 to cm. long, the nest to mm. thick, the calyx-scar conspicuous. 41. ENGELMANN'S THORN — Crattegus brachyacantha Engelmann and Sargent Engelmann's thorn grows in moist soil in s
. 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. Howell's Thorn 475 calyx-lobes triangular; stamens about 20; anthers red; styles 3 to 5. The fruit ripens late; it is globose to subglobose, red, 4 to 6 mm. thick, calyx-lobes reflexed; flesh dry and mealy; it contains 3 to 5 nutlets, 3 to cm. long, the nest to mm. thick, the calyx-scar conspicuous. 41. ENGELMANN'S THORN — Crattegus brachyacantha Engelmann and Sargent Engelmann's thorn grows in moist soil in southern Arkansas, Louisiana, and Texas. It is a tree sometimes 15 meters high, with spreading branches, forming a round-topped crown; the bark is dark brown, deeply furrowed; the twigs are reddish brown, smooth, and are armed with curved spines i to 2 cm. long, and the ends of the branches often terminate in spines. The leaves are oblanceolate- elliptic or narrowly ovate, to 5 cm. long, i to cm. wide, pointed or rounded at the apex, wedge-shaped decurrent below, crenate-toothed, smooth, half- leathery, dark green and shining above, paler beneath, the veins not very conspicuous; leaf-stalks narrowly wing-margined above, i to 2 cm. long. The flowers are about 10 mm. wide in smooth, many-flowered corymbs; calyx- lobes short-pointed; stamens 15 to 20; styles 3 to 5. The fruit ripens early; it is subglobose, about 10 mm. thick, blue-black, with a glaucous bloom; calyx- lobes spreading; flesh thin; it contains 4 or 5 nutlets 5 to mm. long, the nest to 8 mm. Fig. 431. — Engelmann's Thorn. 42. HOWELL'S THORN —Cratasgus colmnbiana HoweU HoweU's thorn occurs commonly along the tributaries of the Columbia River, east of the Cascade Mountains, and extends east to central-northern North Dakota, and north into British Columbia. It is a much-branched shrub or small tree, sometimes 5 meters high; the twigs are reddish brown, smooth, and bear some chestnut-brown sp
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