FABACEAE 617 



2. Astragalus Brazo6nsis Buckl. Plant villous-strigillose. Stems mostly branched 

 at the base, the branches decumbent or ascending, 3-20 cm. long, sparsely hairy : 

 leaves 3-6 cm. long ; leaflets 9-21, the blades oblong to obovate, 3-6 mm. long, notched 

 at the apex, short-stalked : peduncles surpassing the subtending leaves : racemes ovoid 

 to oblong, 1-3 cm. long : calyx membranous ; lobes subulate-lanceolate, about as long 

 as the tube : corolla whitish or violet, 5-8 mm. long : pods nearly as thick as long, 6-8 

 mm. in diameter, abruptly pointed. 



In sandy soil, Texas. Spring. 



3. Astragalus reflexus T. & G. Plant finely villous. Stems simple and erect or 

 branched at the base, the branches ascending or spreading, 1-4 dm. long : leaves 5-10 cm. 

 long ; leaflets 13-15, the blades cuneate-obovate, 6-12 mm. long, notched at the apex, 

 short-stalked : peduncles surpassing the subtending leaves : racemes capitate : calyx mem- 

 branous ; lobes nearly subulate, about as long as the tube : corolla bluish white, 6-7 mm. 

 long : pods leathery, narrowly conic, 7-8 mm. long, deflexed, short-beaked, transversely 

 wrinkled, deeply grooved above. 



In dry soil, Texas. Spring and summer. 



4. Astragalus Carolinianus L. Plant glabrous or sparingly pubescent. Stems erect 

 or ascending, 3-12 dm. tall, simple or branching above : leaves 1-3 dm. long ; leaflets 15- 

 30, the blades oblong, elliptic, or oblong-lanceolate, 2-4 cm. long, obtuse or slightly 

 notched at the apex, short-stalked : peduncles shorter than the subtending leaves or longer : 

 racemes 3-15 cm. long, many-flowered : calyx membranous ; lobes subulate-lanceolate, 

 shorter than the tube : corolla greenish yellow, about 1.5cm. long : pods oblong, 12-18 mm. 

 long, inflated, 2-celled, glabrous, erect or ascending. \_A. Canadensis L.] 



In dry soil, Quebec to the Rocky Mountains, Georgia, Louisiana and Colorado. Summer. 



22. HAMOSA Medic. 



Annual or biennial herbs (our species), with decumbent stems. Leaves alternate, the 

 stipules almost free and distinct : leaflets numerous, the blades entire, often truncate or 

 notched at the apex. Flowers perfect, few, in short racemes. Calyx short -campanulate : 

 lobes almost equal, mostly subulate. Corolla usually purplish : standard with a relatively 

 broad blade : wings somewhat longer than the keel-petals. Stamens 10 : filaments dia- 

 delphous : anthers alike. Ovary sessile. Ovules numerous. Pod linear, often elongated, 

 laterally flattened, membranous or thin-walled, if at all sulcate only slightly so along the 

 lower suture, 2-celled, the partition as in the 2 preceding genera. Seeds numerous. 



Pods straight. 1. H. leptocarpa. 



Pods curved. 



Corolla over 12 mm. long : pods 4.5-5.5 mm. wide. 2. H. Lindheimeri. 



Corolla less than 11 mm. long : pods 2-2,5 mm. wide. 

 Pods glabrous. 



Corolla 6-8 mm. long : leaflets cuneate to oblong, notched. 3. H. Nuttalliana. 



Corolla 9-10 mm. long : leaflets linear, acute. 4. H. macilenta. 



Pods pubescent. 5. H. austrina. 



1. Hamosa leptocarpa (T. & G.) Rydb. Plant more or less densely strigillose. 

 Stems nearly simple and erect or branched at the base, the branches ascending or spread- 

 ing, 1-3 dm. long : leaves 3-8 cm. long ; leaflets 9-19, the blades oblong to cuneate-oblong, 

 3-8 mm. long, notched at the apex, short-stalked : peduncles surpassing the subtending 

 leaves : racemes few-flowered : calyx thin ; lobes lanceolate or triangular-lanceolate, acumi- 

 nate, about as long as the tube : corolla purplish, 8-10 cm. long : pods linear, 2.5-3 cm. 

 long, straight or nearly so, acute. [Astragalus leptocarpus T. & G. ] 



In dry soil, Texas. Spring. 



2. Hamosa Lindheimeri (Engelm.) Kydb. Plant strigillose. Stems branched at 

 the base, the branches ascending or prostrate, 1-4 dm. long : leaves 2-7 cm. long, rather 

 numerous ; leaflets 15-23, the blades oblong to oval or oval-obovate, usually notched at the 

 apex, approximate, short-stalked : peduncles about as long as the subtending leaves or 

 longer : racemes few-flowered : calyx membranous ; lobes subulate-filiform, longer than the 

 campanulate tube : corolla purplish, about 1.5 cm. long : pods linear-scythe-shaped, 2.5-3 

 cm. long, beaked, finely reticulated. [Astragalus Lindheimwi Engelm.] 



On plains and on rocky hills, Texas. Spring and summer. 



3. Hamosa Nuttalliana (DC.) Rydb. Plant sparingly silky-strigillose or nearly 

 glabrous. Stems simple and erect or branched at the base, the branches ascending or 

 spreading, 2-30 cm. long : leaves 2-5 cm. long ; leaflets 11-15, the blades oblong, obovate 

 or cuneate, 2-10 mm. long, mainly notched at the apex, short-stalked : peduncles usually 

 surpassing the subtending leaves : racemes loosely flowered : calyx membranous ; lobes 



