. 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. Rough-Leaved Thorn 477 and sweet when mature; it contains 4 or 5 nutlets 6 to 7 mm. long, strongly ridged on the back, with a shallow pit on each inner face, the nest 7 to 8 mm. thick. 44. PRAIRIE THORN — Cratsegns pertomentosa Ashe CratcBgus campestris Britton s This species is found in rocky barrens from western Missouri and eastern Kan- sas to central Iowa. It is a tree sometimes 5 meters high, with nearly horizontal b
. 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. Rough-Leaved Thorn 477 and sweet when mature; it contains 4 or 5 nutlets 6 to 7 mm. long, strongly ridged on the back, with a shallow pit on each inner face, the nest 7 to 8 mm. thick. 44. PRAIRIE THORN — Cratsegns pertomentosa Ashe CratcBgus campestris Britton s This species is found in rocky barrens from western Missouri and eastern Kan- sas to central Iowa. It is a tree sometimes 5 meters high, with nearly horizontal branches, forming a flattened crown; the bark is dark gray; the twigs are reddish brown, hairy, soon becoming smooth and armed with numerous chest- nut-brown curved spines from 3 to 9 cm. long. The leaves are oblong to ovate, 3 to 7 cm. long, 2 to 6 cm. wide, sharply and finely doubly toothed, with 4 or 5 pairs of small abruptly sharp-pointed lobes, pointed at the apex, broadly wedge-shaped or rounded at the base, slightly long-hairy above, particularly along the veins when young, be- coming smooth, hairy beneath, more thickly along the veins, half leathery, bright dark green above, paler beneath; leaf-stalks about i cm. long, winged, shghtly hairy, glandular. The flowers are about 2 cm. wide, in many-flowered densely long-hairy corymbs; calyx-tube densely long-hairy, the lanceolate long-pointed lobes deeply toothed, with glandular tips, hairy on the inside, nearly smooth without; stamens 10 to 15; styles 2 or 3. The fruit, ripening in September, is 8 to 13 mm. thick, round, cherry-red, hairy when young; flesh yellow, succu- lent, becoming mealy when mature, epclosing 2 or 3 nutlets 5 to mm. long, ridged on the back and pitted on the inner face, pits varying from shallow to deep and occasionally wanting on individual nutlets, the nest of nutlets 5 to mm. Fig. 434. — Prairie Thom. 45. ROUGH-LEAVED THORN — Oratagus asperifolia Sargent CrattBgus Deweyana Sarge
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkhholtandco
