. 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. 562 Indigo Bush are narrowly oblong, pendent, smooth, pointed, about cm. long, nearly straight, and usually bear only one flat seed. The wood is hard and dense, reddish brown, with a specific gravity of IX. INDIGO BUSH GENUS PAEOSELA. CAVANILLES Species Parosela spinosa (A. Gray) Heller Dalea spinosa A. Gray HIS small spiny tree, or more often a much branched shrub, occurs in the deserts of southern California,
. 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. 562 Indigo Bush are narrowly oblong, pendent, smooth, pointed, about cm. long, nearly straight, and usually bear only one flat seed. The wood is hard and dense, reddish brown, with a specific gravity of IX. INDIGO BUSH GENUS PAEOSELA. CAVANILLES Species Parosela spinosa (A. Gray) Heller Dalea spinosa A. Gray HIS small spiny tree, or more often a much branched shrub, occurs in the deserts of southern California, southwestern Arizona ajttd adjacent Mexico. Its maximum height is 6 meters, with a trunk diameter up to 5 dm. It is also called Dalea and Indigo thorn. The trunk is usually very short, branching near the base. The bark is about 5 mm. thick, deeply fissured into grayish brown scales. The twigs are slender, finely hairy; spines 5 cm. long or less. The leaves are few near the bases of the spine- like twigs, consisting of but one leaflet, which is wedge-shaped, about 2 cm. long, blimtly pointed, sessile or nearly so, wavy and glandular on the margin, and whitish hairy; they fall off soon after unfolding. The flowers appear in June or July in racemes to 4 cm. long, the white hairy rachis spine-tipped; they are short- stalked; the calyx-tube is lo-ribbed, glandular between the ribs, its blunt lobes ovate; the petals are dark blue; stamens united into a tube, the anthers all alike, often vrith a gland, 2-celled and opening lengthwise; ovary sessile, hairy and glan- dular; style slender; ovules usually Fig. 520. — Indigo Bush. The fruit is a one-seeded, compressed ovate pod about 8 mm. long, partly enclosed by the persistent calyx and tipped by the withering style; seed kidney-shaped, about 3 mm. long, shining, brown and mottled. The wood is soft, rather coarse-grained, and brown; its specific gravity is about Seedling plants bear oblong or oblanceolate toothed leaves s
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