. 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. 454 The Thorn Trees slightly hairy above when young, becoming smooth, thick, dull gray-green; midrib and veins strongly simken in the upper surface; leaf-stalks slightly winged, i to 2 cm. long. The flowers are about 15 mm. wide in many-flowered, woolly-hairy corymbs; calyx-tube short-hairy, the lan- ceolate pointed lobes less so; stamens about 20; anthers white to pink; styles 3 to 5. The fruit ripens late; it is short-
. 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. 454 The Thorn Trees slightly hairy above when young, becoming smooth, thick, dull gray-green; midrib and veins strongly simken in the upper surface; leaf-stalks slightly winged, i to 2 cm. long. The flowers are about 15 mm. wide in many-flowered, woolly-hairy corymbs; calyx-tube short-hairy, the lan- ceolate pointed lobes less so; stamens about 20; anthers white to pink; styles 3 to 5. The fruit ripens late; it is short- oblong to subglobose, 12 to 25 mm. thick, dull red, yellowish green to bright yellow, dotted; calyx-lobes spreading; flesh firm, dry; it contains 3 to 5, usually 3 or 4 nutlets, 8 to 9 mm. long, 8 to 10 mm, thick, with ridged backs and pointed ends. This species is also very variable. The variety aurea Aiton, has yellow fruit, lighter anthers, and slightly smaller nutlets than the type. Variety canescens Brit- ton is a form with whitish woolly-hairy leaves and Fig. 398. — Large-fruited Thorn. 9. CAUGHNAWAGA THORN — Crataegus suborbiculata Sargent This thorn occurs about the limestone ridges of the Caughnawaga Indian reservation and on the island of Mon- treal, Quebec. It is a tree from 5 to 6 meters high, with spreading branches, forming a broad flat-topped crown; the twigs are smooth and are armed with straight or curved chestnut-brown spines, from 3 to 5 cm. long. The leaves arc ovate-orbicular, from 2 to 7 cm. long, and from 2 to 6 cm. wide, the apex pointed, the base broadly wedge-shaped, doubly toothed or often lobed above the middle, thin, smooth with impressed veins and dull ^^°- 399- — Caughnawaga Thorn. dark green above, paler beneath; leaf-stalks winged above, glandular, i to 2 cm. long. The flowers are about 2 cm. broad in several-flowered smooth corymbs, calyx-lobes linear, long-pointed, with remote glandular teeth; stamens about 20; anthers rose; s
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