Astragalus allochrous var. playanus (M. E. Jones) D. Isely

Phaca tracyi Rydberg, sp. nov
Annual, with a deep root; stems several, strigose, decumbent or ascending, branched, 1 dm. high or less; leaves 5 dm. long or less; lower stipules connate and scarious, the upper distinct, deltoid, acuminate, 4-5 mm. long; leaflets 1 1-15, oblong, hirsute-strigose on both sides, 6-10 mm. long, 2-3 mm. wide; peduncles less than 2 cm. long; racemes few-flowered, short; calyx strigose, the tube 2 mm. long, the lobes subulate, 2 mm. long; corolla apparently white, 5-6 mm. long, similar to that of P. Wootoni; legumes sessile, strigose ovoid, 1-1.5 cm. long, 12-14 mm. wide; seeds like those of P. Wootoni.
Type collected on Tovah Creek, western Texas, April 21, 1902. Tracv b° Earle 78 (herb. N. Y. Bot. Gard.).
Distribution: Western Texas and Chihuahua.

Astragalus wootonii adalah spesies tumbuhan yang tergolong ke dalam famili Fabaceae. Spesies ini juga merupakan bagian dari ordo Fabales. Spesies Astragalus wootonii sendiri merupakan bagian dari genus Astragalus. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh E.Sheld..