Comprehensive Description
provided by North American Flora
Phaca thurberi (A. Gray) Kearney, Trans. N. Y. Acad 14:34. 1894.
Astragalus Thurberi A. Gray. Mem. Am. Acad. II. 5: 312. 1854. Tragacantha Thurberi Kuntze, Rev. Gen. 948. 1891.
Perennial; stems 2-3 dm. high, more or less grayish-strigose or glabrate, striate, branched; leaves ascending, 6-10 cm. long; stipules triangular, distinct; leaflets 13-17, oblong or linearoblong, retuse or obtuse, 8-15 mm. long, sparingly strigose, or glabrate above; peduncles 2-5 cm. long; racemes about as long, 10-20-flowered; calyx strigose, the tube 2 mm. long, the lobes 1.5 mm. long, subulate; corolla ochroleucous or tinged with purple, 6 mm. long; pod subglobosesessile, sparingly strigose, 6-10 mm. long; seeds obliquely round-reniform, 2 mm. long.
Type locality: Near Kronteras, Sonora.
Distribution: Arizona, Sonora, and western New Mexico.
- bibliographic citation
- Per Axel Rydberg. 1919. (ROSALES); FABACEAE; PSORALEAE. North American flora. vol 24(1). New York Botanical Garden, New York, NY
Physical Description
provided by USDA PLANTS text
Annual, Perennial, Herbs, Stems woody below, or from woody crown or caudex, Taproot present, Nodules present, Stems or branches arching, spreading or decumbent, Stems prostrate, trailing, or mat formin g, Stems less than 1 m tall, Stems solid, Stems or young twigs sparsely to densely hairy, Leaves alternate, Leaves petiolate, Stipules conspicuous, Stipules membranous or chartaceous, Stipules persistent, Stipules free, Leaves compound, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 10-many, Leaves hairy on one or both surfaces, Inflorescences racemes, Inflorescence axillary, Bracts very small, absent or caducous, Flowers zygomorphic, Calyx 5-lobed, Calyx glabrous, Petals separate, Corolla papilionaceous, Petals clawed, Petals red, Petals blue, lavander to purple, or violet, Banner petal narrow or oblanceolate, Wing petals narrow, oblanceolate to oblong, Wing tips obtuse or rounded, Keel petals auriculate, spurred, or gibbous, Stamens 9-10, Stamens diadelphous, 9 united, 1 free, Filaments glabrous, Style terete, Style persistent in fruit, Fruit a legume, Fruit unilocular, Fruit tardily or weakly dehiscent, Fruit oblong or ellipsoidal, Fruit o rbicular to subglobose, Fruit exserted from calyx, Fruit inflated or turgid, Fruit beaked, Fruit glabrous or glabrate, Fruit hairy, Fruit 3-10 seeded, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.
