Part 4, 1921] FABACEAE: GALEGEAE 229 



10. OLNEYA A. Gray, Mem. Am. Acad. II. 5: 328. 1855. 



Tcsota C. Mueller, in Walp. Ann. 4: 479. 1857. 



Canescent spinose trees, with abruptly pinnate or odd-pinnate leaves, with obsolete stipules 

 and no stipels. Calyx campanulate, 5-lobed, the upper two lobes united to near the apex. 

 Banner short-elawed, the blade orbicular, emarginate, reflexed, with two callosities at the base. 

 Wings obliquely obovate, strongly falcate, with small basal auricles, short-clawed. Keel- 

 petals short-clawed, the blades broadly lunate, almost semi-circular, with a broad rounded 

 basal auricle. Stamens diadelphous, nearly of equal length, the sheath cylindric, curved; 

 anthers uniform. Ovary short-stipitate, several-ovuled; style arcuate, incurved, pubescent 

 above; stigma capitate, terminal. Pod rather turgid, 2-valved. torulose, puberulent and 

 glandular-hispid. Seeds erect, rounded-ellipsoid, scarcely compressed. 



Type species, Olneya Tesola A. Gray. 



1. Olneya Tesota A. Gray, Mem. Am. Acad. II. 5: 328. 1855. 



A tree, 5-8 m. high; branches striate, densely canescent, subvelutinous; spines 5-10 mm. 

 long, paired or solitary under the leaves, with brown or black tips; leaves 3-10 cm. long; 

 leaflets 8-24, oblong or cuneate, rounded at the apex, 5-20 cm. long, densely canescent; racemes 

 axillary, 3^5 cm. long; bracts minute, deciduous; calyx canescent, the tube 3-4 mm. long, the 

 lobes oblong-ovate, 2.5-3 mm. long, abruptly acute; corolla yellow, nearly 1 cm. long; pod 

 4-6 cm. long, 9 mm. thick, canescent and glandular-hispid, with a broad stipe and a broad 

 beak; seeds black, 8-9 mm. long and 6 mm. broad, shining. 



Type locality: Table-lands on the Gila River, Arizona. 



Distribution: Arizona to Southern California, Lower California, and Sonora. 

 Illustrations: Pacif. R. R. Rep. 7: pi. 5; Sargent, Silva pi. 116; Britton, N. Am. Trees/. 515; 

 Sargent, Man./. 475; Am. Jour. Bot. 11: pi. 34 S. 



20. COURSETIA DC. Ann. Sci. Nat. 4: 92. 1824. 



Humboldliella Harms, Repert. Sp. Nov. 19: 12. 1923. 



Shrubs or trees. Leaves abruptly pinnate or odd-pinnate, with many entire petiolulate 

 leaflets and narrow subulate persistent and somewhat spinescent stipules. Flowers in axillary 

 racemes, solitary in the axils of small deciduous bracts. Calyx-tube campanulate or tur- 

 binate, about as broad as high; lobes subequal in length, but the upper two often united higher 

 up. Corolla white, ochroleucous, reddish, or purplish; petals subequal, or the wings shorter. 

 Banner suborbicular with a short claw, sometimes with a pair of callosities. Wings short- 

 clawed, the blades obliquely oblanceolate or oblong, with a basal auricle. Keel-petals with 

 somewhat longer claws, the blades broader, more or less lunate, often semiorbieular, with a 

 small basal auricle, obtuse to acuminate. Stamens diadelphous, the upper filament bent 

 near the base, the staminal sheath often somewhat dilated below. Style strongly indexed at 

 the base, then straight, hairy above on the upper side. Pod linear, 2-valved, compressed, 

 without partitions, usually constricted around the seeds and more or less torulose, sessile or 

 short-stipitate, but the lower portion often narrower and without seeds. Seeds suborbicular, 

 without strophiole, compressed. 



Type species, Coursetia lomenlosa DC. 



Leaves abruptly pinnate; stipels usually wanting. I. Glandulosah. 



Leaves odd-pinnate; stipels usually present. 



Banner without callosities or if present these not well defined and near the 



basal sinuses; keel-petals obtuse or acutish. II. Polypiiyllae. 



Banner with a pair of well defined callosities some distance above the base; 



keel-petals acuminate. III. Madrenses. 



I. Glandulosae 



Inflorescence and pod more or less glandular. 



Leaflets less than 2 cm. long; leaves 2-5 cm. long. 



Leaflets acutish; racemes usually longer than the short leaves. 1. C. microphylla. 



Leaflets rounded or obtuse at each end; racemes shorter than the leaves. 2. C. gland itlosa. 

 Leaflets 3—4 cm. long; leaves 10-15 cm. long. 3. C. Seleri. 



