Dyebush

Psorothamnus emoryi (A. Gray) Rydberg
Dalea Emoryi A. Gray, Mem. Am. Acad. II. 5: 315. 1854. Parosela Emoryi A. Heller, Cat. N. Am. PI. ed. 2. 6. 1900.
A shrub, 1-2 m. high, intricately branched; branches white-velutinous when young, with minute red or orange, in age brown, glands; leaves 1-9 cm. long, white-velutinous and sparingly glandular-dotted; leaflets 1-13, from linear-oblong to elliptic or obovate, entire or sinuate, 5-20 mm. long, the terminal one usually much longer than the rest; peduncles 1-4 cm. long; spikes head-like, short and dense, 12-15 mm. broad, 10-20-flowered; bracts lanceolate, 3-3.5 mm. long, villous and with red glands; calyx-tube turbinate, 2.5 mm. long; lobes subulate, 2.5-3 mm. long, villous; corolla dark-blue or bluish-purple; blade of the banner rounded-cordate, slightly retuse, with a single gland, 4 mm. long, the claw 2 mm. long; blades of the wings obliquely obovate, with a large rounded basal lobe, 4-5 mm. long, usually with a gland, those of the keel-petals much broader, 5 mm. long; pod obliquely obovate, villous and with many small red glands above, glabrous below, slightly exceeding the calyx-tube.
Type locality: Tablelands of the Gila. Arizona.
Distribution: Arizona, southern California, Sonora. and Lower California.

Perennial, Shrubs, Woody throughout, Stems woody below, or from woody crown or caudex, Nodules present, Stems erect or ascending, Stems or branches arching, spreading or decumbent, Stems less than 1 m tall, Trunk or stems armed with thorns, spines or prickles, Plants gland-dotted or with gland-tipped hairs, Stems solid, Stems or young twigs sparsely to densely hairy, Leaves alternate, Leaves petiolate, Stipules inconspicuous, absent, or caducous, Stipules setiform, subulate or acicular, Stipules deciduous, Stipules free, Leaves compound, Leaves odd pinnate, Leaf or leaflet mar gins entire, Leaflets alternate or subopposite, Leaflets 5-9, Leaves glandular punctate or gland-dotted, Leaves glabrous or nearly so, Inflorescences racemes, Inflorescence axillary, Inflorescence or flowers lax, declined or pendulous, Bracts conspicuously present, Flowers zygomorphic, Calyx 5-lobed, Calyx gland-dotted or with glandular spot, Calyx hairy, Petals separate, Corolla papilionaceous, Petals blue, lavander to purple, or violet, Banner petal suborbicular, broadly rounded, Wing petals narrow, oblanceolate to oblong, Wing tips obtuse or rounded, Keel tips obtuse or rounded, not beaked, Stamens 9-10, Stamens monadelphous, united below, Filaments glabrous, Style terete, Fruit a legume, Fruit unilocular, Fruit indehiscent, Fruit oblong or ellipsoidal, Fruit exserted from calyx, Fruit glabrous or glabrate, Fruit gland-dotted or with gland-tipped hairs, Fruit 1-seeded, Fruit 2-seeded, Seeds ovoid to rounded in outline, Seed surface smooth, Seeds olive, brown, or black, Psorothamnus emoryi Perennial, Shrubs, Woody throughout, Stems woody below, or from woody crown or caudex, Nodules present, Stems erect or ascending, Stems or branches arching, spreading or decumbent, Stems less than 1 m tall, Trunk or stems armed with thorns, spines or prickles, Plants gland-dotted or with gland-tipped hairs, Stems solid, Stems or young twigs sparsely to densely hairy, Stems silvery, canescent, tomentose, cobwebby, or wooly, Leaves absent at flowering time, Leaves alternate, Leaves petiolate, Stipules inconspicuous, absent, or caducous, Stipules setiform, subulate or acicular, Stipules deciduous, Stipules free, Leaves compound, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets alternate or subopposite, Leaflets 5-9, Leaves glandular punctate or gland-dotted, Leaves glabrous or nearly so, Inflorescences racemes, Inflorescences globose heads, capitate or subcapitate, Inflorescence axillary, Inflorescence or flowers lax, de clined or pendulous, Bracts conspicuously present, Flowers sessile or nearly so, Flowers zygomorphic, Calyx 5-lobed, Calyx gland-dotted or with glandular spot, Calyx hairy, Petals separate, Corolla papilionaceous, Petals white, Petals blue, lavander to purple, or violet, Petals bicolored or with red, purple or yellow streaks or spots, Banner petal suborbicular, broadly rounded, Wing petals narrow, oblanceolate to oblong, Wing tips obtuse or rounded, Keel tips obtuse or rounded, not beaked, Stamens 9-10, Stamens monadelphous, united below, Filaments glabrous, Style terete, Fruit a legume, Fruit unilocular, Fruit indehiscent, Fruit oblong or ellipsoidal, Fruit enclosed in calyx, Fruit hairy, Fruit gland-dotted or with gland-tipped hairs, Fruit 1-seeded, Fruit 2-seeded, Seeds ovoid to rounded in outline, Seed surface smooth, Seeds olive, brown, or black.

Psorothamnus emoryi, common names dyebush, white dalea, or Emory's indigo bush, is a perennial legume shrub or subshrub common to the desert mesas of the southern part of the U.S. states of Arizona and California, and regions of the Mexican state of Baja California.

Psorothamnus emoryi là một loài thực vật có hoa trong họ Đậu. Loài này được (A.Gray) Rydb. miêu tả khoa học đầu tiên.