OF ARTS AND SCIENCES. 349 



Desmanthus incurvus, Benth. At Parras, Coahuila (314), and 

 in the Sierra Madre south of Saltillo. This is also 201 Parry & 

 Palmer, referred to D. depressus.* 



* The North American species of Desmanthus may be grouped and distin- 

 guished as follows : — 



* Stamens 5. — Glabrous or nearly so: pinnas 2 to 8 (usually 5) pairs, on a 

 rhachis i to 3 inches long; leaflets linear: pod not attenuate at base. 



1. D. BRACHYLonus, Boutli. Stout: heads many-flowered: peduncles 1 to 3 

 inches long: pod oblong, 2 or 3 lines broail, falcate. — Illinois and llorida to 

 Texas and New Mexico. 



2. D. LKPToi.OBus, Torr. & Gray. Slender : hcad.s small : peduncles | to 1 

 inch long: pod elongated linear, a line broad, straight, acuminate. — Arkansas 

 and Texas. 



* * Stamens 10. — Pod linear: leaflets oblong. 



4- Pinna; 2 to (usually 4 or 5) pairs on a rhachis h to \h inches long ; leaflets 

 veinless. 



++ Heads many-flowered, on short peduncles. 



3. D. Jamesti, Torr. & Gray. Rather stout, glabrous, or slightly pubescent 

 and the leaflets ciliate : peduncles usually approximate at the summit, occasion- 

 ally in pairs : pod 1^ to 3 inches long by li or 2 lines broad, acuminate, obtuse 

 or but slightly narrowed at base. — S. Colorado and W. Texas to Arizona. 



■w ++ Heads smaller, on peduncles 1 to 2J inches long : pubescent or rarely 

 nearly glabrous. 



4. D. vELrTiNcs, Scheele. Pod 1 to 2\ inches long by 1 or \h lines broad, 

 acuminate, attenuate at base, straight or nearly so. — Texas. 



5. D. iNCURVCS, Benth. Pod 8 to 20 lines long by 2| or 3 broad, aciuninate, 

 rounded or scarcely narrowed at base. — Mexico. 



-1- -t- Pinna3 1 to 4 pairs : heads small. 

 +-4- Peduncles short (I to 1 inch long) : rhachis short (\ inch or less) ; pinnas 

 usually 1 or 2 pairs ; leaflets veinless : pod 1 to 2 J- inches long, acuminate, atten- 

 uate at base. — Species scarcely distinct. 



6. D. DEPRESSUS, Hurab. & Bonpl. Usually glabrous, low and depressed, 

 very slender : leaflets small and narrow: pod straight or nearly so. — Florida 

 to Texas, Mexico, etc. 



7. D. viRGATUs, Willd. Stouter and more erect: leaflets mostly larger and 

 broader. — Florida, W. Indies and S. America. 



8. D. ACCMiNATcs, Bcntli. More pubescent: peduncles rarely over h inch 

 long : pod 10 to 20 lines long, more or less curved. — Texas. 



++ ++ Peduncles elongated (1 to 4 inches) • leaflets veined : pod 1 to 1^ inches 

 long, obtuse or slightly narrowed at base. 



9. D. RETiccLATUs, Bcuth. Glabrous or nearly so : rhachis h to 1| inches 

 long : peduncles usually 3 or 4 inches long : pod acuminate. — Texas. 



10. D. OBTUSUS, Watson. Pubescent : rhachis usually very short (i inch 

 or less): peduncles 1 to 2^ inches long: pod obtuse, apiculate. — W. Texas. 

 (Seep. 371.) 



