230 NORTH AMERICAN FLORA [Volume 24 



Inflorescence and pod not glandular. 



Leaves 2 cm. long or less; leaflets 3-8 mm. long; pod torulose; racemes 



short, 1-4-flowered. 4. C. axillaris. 



Leaves 15-20 cm. long; leaflets 20-50 mm. long; pod not torulose; 



racemes many-flowered. 5. C. arborea. 



II. Poi.YPHYI.LAE 



Leaflets glabrous throughout or sparingly strigulose beneath. 



Leaf-rachis not winged ; peduncles and pods glabrous. 6. C. polyphylla. 



Leaf-rachis winged; peduncles and pods glandular-pubescent. 7. C. planipetiolata. 



Leaflets densely pilose on both sides; peduncles and pods pubescent and 



glandular. 8. C. mollis. 



III. MadrensBS 

 One species. 9. C. madrensis. 



1. Coursetia microphylla A. Gray, Proc. Am. Acad. 17: 201. 



1882. 



A low shrub; branches cinereous when young, soon glabrate, brown, striate; stipules 

 subulate, 3-5 mm. long, subspinescent, ascending; leaves 2-3 cm. long; rachis strigose- 

 canescent; leaflets 10-16, elliptic, 5-8 mm. long, acute at the base, acute and cuspidate- 

 mucronate at the apex, sericeous-strigose on both sides, subcoriaceous; racemes 3-4 cm. long, 

 few-flowered, rather lax, the peduncles and its branches glandular and puberulent; bracts 

 small, lanceolate, deciduous; calyx glandular, the tube turbinate, 3 mm. long, the lobes deltoid- 

 lanceolate, 2 mm. long; corolla white, tinged with rose, about 1 cm. long, the petals sub-equal, 

 short-clawed; banner suborbicular, retuse; blades of the wings oblong, with a rounded basal 

 auricle; those of the keel-petals semiorbicular, obtuse, with a broad basal auricle; pod sub- 

 sessile, torulose, 5 cm. long, 5-6 mm. wide, densely glandular; seeds suborbicular. Closely 

 related, to the next species, and perhaps not distinct. 



Type locality: Santa Catalina Mountains, Arizona. 

 Distribution: Southern Arizona and northern Sonora. 

 Illustration: Am. Jour. Bot. 11: pi. 34 T,f. 1-8. 



2. Coursetia glandulosa A. Gray, Proc. Am. Acad. 5: 156. 1861. 



A low shrub; branches sericeous when young, soon glabrate, purplish, striate; stipules 

 subulate, subspinescent, 3 mm. long, ascending; leaves 3-5 cm. long; rachis strigose, sulcate on 

 the upper side; leaflets 12-18, without stipels, 5—1 S mm. long, 3-8 mm. wide, oblong or elliptic, 

 rounded or obtuse at each end, mucronate, sparingly strigulose on both sides, in age glabrate; 

 racemes short, few-flowered, axillary, often 2 or 3 together. 2-3 cm. long, the peduncle and its 

 branches subvelutinous and glandular-pubescent; bracts lanceolate; calyx puberulent and 

 densely glandular, the tube turbinate, 3mm. long, the lobes 1.5 mm. long, deltoid, acute; corolla 

 yellow, tinged with rose, about 1 cm. long; wings oblong-obovate, with a large basal auricle and 

 a claw about 2 mm. long; keel-petals with claws 5 mm. long, the blades semiorbicular, obtuse, 

 with a broad basal auricle; pod sessile, 4-5 cm. long, 7 mm. wide, torulose, puberulent and glan- 

 dular, 6-12-seeded; seeds compressed, suborbicular, 4-5 mm. in diameter, brown. 



Type locality: Cape San Lucas, Lower California. 

 Distribution: Lower California, Sonora, and Sinaloa. 



3. Coursetia Seleri Harms, Repert. Sp. Nov. 19: 14. 1823. 



Coursetia microphylla M. Micbeli. Mem. Soc. Geneve 34: 253. 1903. Not C. microphvlla A. Gray, 



1882. 

 Coursetia Seleri Caeciliae Harms, Repert. Sp. Nov. 19: 14. 1823. 



A shrub or tree, 5-6 m. high; branches silky when young, soon glabrous, densely warty with 

 lenticels, straw-colored; stipules subulate-setaceous, 5-8 mm. long; leaves 1-1.5 dm. long; rachis 

 sparingly strigose, sulcate above; leaflets 16-22, elliptic, 2-4 cm. long, 1-1.5 cm. wide, sparingly 

 strigulose or soon glabrate, thin, mucronate. rounded at each end; racemes often 2 or 3 in each 

 axil, 3-6 cm. long, 5-10-flowered, the peduncle and its branches glandular and puberulent; 



