40 NORTH AMERICAN FLORA [Volume 24 



lent to glabrate above and beneath, punctate beneath with small dark-brown dots, not reticu- 

 late above, firm; racemes 2-5 cm. long; bracts 1-2 mm. long, lanceolate-attenuate, brown, 

 loosely pubescent, long-persistent; calyx-tube 2.5 mm. long, glandular-dotted, canescent, 

 ridged, split nearly to the base on the posterior side; lobes nearly equal, 0.9-1 mm. long, pubes- 

 cent, ciliate; petals 4-5 mm. long, thin, membranous, twice as long as the calyx, the standard 

 slightly broader, slightly emarginate; style upcurved at the apex, with a rudimentary gland; 

 pods small, thickened, more or less ridge-veined, dark-brown, not known mature. 



Typb locality: Lower California. 



Distribution: Known only from the type locality. 



14. Eysenhardtia spinosa Engelm.; A. Gray, Bost. Jour. Nat. 

 Hist. 6: 174. 1850. 



Wiborgia spinosa Kuntze, Rev. Gen. 213. 1891. 



Viborquia spinosa Cockerell, Bull. Am. Mus. Nat. Hist. 24: 97. 1908. 



An intricately branched shrub; stems gray, the young growth cinereous-canescent with in- 

 curved to appressed whitish hairs; leaves 1-2.5 cm. long, spreading; stipules 1-1.5 mm. long, 

 brown, subulate; stipels subulate, dark-brown, 0.3-0.5 mm. long, equaling the petiolules, per- 

 sistent; leaflets 13-17, oblong-oblanceolate, 3-4 mm. long, pale-green above, glaucous beneath, 

 glabrous above, finely puberulent and punctate beneath with small dark dots, obscurely reticu- 

 late above, slightly thickened; racemes 1-3 cm. long; bracts 1-2 mm. long, ovate-acuminate, 

 brown, loosely canescent, persistent until fruit matures; calyx-tube 2-3 mm. long, glandular- 

 dotted, canescent, purple, ridged, split nearly to the base on the posterior side; lobes unequal, 

 the three anterior longer, acuminate, 0.7-1 mm. long, pubescent, ciliate; petals 4—4.5 mm. long, 

 firm, from less than twice to twice as long as the calyx, light-yellow, the standard slightly 

 broader, notched; style 2-3 mm. long, relatively densely pubescent, sharply upcurved, without 

 a gland; pods 5-6 mm. long, 2 mm. wide, much thickened, strongly ridge-veined, dark- 

 brown, soon glabrate, punctate distally with minute glands, at maturity ascending, on pedicels 

 scarcely 0.5 mm. long; seed 3.2-3.4 mm. long, obovoid, thick, ridged laterally, the surface 

 very smooth, dark-brown, with a broad basal lobe, filling the entire pod. 



Type locality: Lake Encinillas, Chihuahua. 

 Distribution: Chihuahua. 



13. PSOROBATUS* Rydberg, gen. nov. 



Low shrubs, with spinescent stipules and white-tomentose and glandular-pustulate 

 branches. Leaves pinnate, with orbicular leaflets. Flowers spicate; bracts narrow, gland- 

 tipped. Calyx deeply campanulate, with oblong lobes. Petals yellow, somewhat fleshy, 

 distinct, inserted at the base of the staminal tube, neither oblique, nor distinctly clawed, 

 the banner broader than the rest. Stamens 9, monadelphous, alternately longer and shorter. 

 Stigma rather large, capitate. Pod ovoid or ellipsoid, turgid, without prominent sutures, 

 exserted, 2-ovuled, 1- or 2-seeded, with a slender beak. 



Type species, Dalea Benthami Brand. 



Stipular spines 3-9 mm. long; terminal leaflet only retuse; banner about twice 



as broad as the other petals. 1 . P. Benthami. 



Stipular spines 1-2 mm. long; all leaflets retuse; banner 3—4 times as broad as 



the other petals. 2. P. megacarpus. 



1. Psorobatus Benthami (Brand.) Rydberg. 



Dalea ? sp. Benth. Bot. Voy. Sulph. 12. 1844. 



Dalea megacarpa Greene. Pittonia 1: 202. 1888. Not D. megacarpa S. Wats. 1885. 



Dalea Benthami Brand. Proc. Calif. Acad. II. 2: 148. 1889. 



Dalea megacarpa biuncifera Greene; Vasey & Rose, Contr. U. S. Nat. Herb. 1: 15. 1890. 



A low shrub, less than 1 m. high; branches white-tomentose, densely glandular-pustulate 

 with orange or brown glands; leaves 2-4 cm. long; stipules spinescent, at first gland-tipped, 

 3-9 mm. long, often somewhat recurved at the base; rachis tomentose and glandular- 



* From \pupa, scab, and 0aros, bramble, on account of the glandular pustules and spinescent 

 stipules. 



