LEGUMINOS.E , (PULSE FAMILY.) 137 



16. A. flexu6sus, Dougl. Ashy-pubenilent, ascending (1-2 nigh); 

 leaflets 11-21, mostly narrow; flowers small, in loose racemes; pod thin-cori- 

 aceous, cylindric (8-11" long, 2" broad), pointed, straight or curved, puber- 

 uleut, very shortly stipitate. Red River Valley, Miiiu., to Col. 



22. OXYTROPIS, DC. 



Keel tipped with a sharp projecting point or appendage ; otherwise as in 

 Astragalus. Pod often more or less 2-celled by the intrusion of the ventral 

 suture. Our species are low, nearly acaulescent perennials, with tufts of 

 numerous very short stems from a hard and thick root or rootstock, covered 

 with scaly adiiate stipules ; pinnate leaves of many leaflets ; peduncles scape- 

 like, bearing a head or short spike of flowers. (Name from oi>j, sharp, and 

 rpoiris, keel.) 



* Leaves simply pinnate, 



1. O. campestris, DC., var. caerulea, Koch. Pubescent or smoothish ; 

 leaflets lanceolate or oblong ; flowers violet or blue, sometimes pure white ; 

 pods ovate or oblong-lanceolate, of a thin or papery texture. N. Maine to 

 Labrador. 



2. O. Lamb^rti, Pursh. Silky with fine oppressed hairs ; leaflets mostly 

 linear ; flowers larger, purple, violet, or sometimes white ; /tods cartilaginous 

 or firm-coriaceous in texture, silky-pubescent, strictly erect, cylindraceous-lan- 

 ceolate and long-pointed, almost 2-celled by intrusion of the ventral suture. 

 Dry plains, Sask. and Minn, to Mo. and Tex., west to the mountains. 



* * Leaflets numerous, most!// in fascicles of 3 or 4 or more along the rhachis, 



3. O. splendens, Dougl Silvery silky-villous (6-12' high) ; scape spi- 

 cately several to many-flowered ; flowers erect-spreading ; pod ovate, erect, 2- 

 celled, hardly surpassing the very villous calyx Plains of Sask. and W. Minn., 

 to N. Mex. and the Rocky Mts. 



23. GLYCYRRHIZA, Tourn. LIQUORICE. 



Calyx with the two upper lobes shorter or partly united. Anther-cells con- 

 fluent at the apex, the alternate ones smaller. Pod ovate or oblong-linear, 

 compressed, often curved, clothed with rough glands or short prickles, scarcely 

 dehiscent, few-seeded. The flower, etc., otherwise as in Astragalus Long 

 perennial root sweet (whence the name, from y\vKvs, sweet, and ia, root) ; 

 herbage glandular-viscid ; leaves odd-pinnate, with minute stipules ; flowers in 

 axillary spikes, white or bluish. 



1. G. lepidbta, Nutt. (WILD LIQUORICE.) Tall (2 - 3 high) ; leaflets 

 15-19, oblong-lanceolate, mucronate-pointed, sprinkled with little scales when 

 young, and with corresponding dots when old ; spikes peduncled, short ; flowers 

 whitish ; pods oblong, beset with hooked prickles, so as to resemble the fruit 

 of Xanthium on a smaller scale. Minn, to Iowa and Mo., and westward ; Ft. 

 Erie, Out. 



24. JESCHYNOMENE, L. SENSITIVE JOINT- VETCH. 



Calyx 2-lipped ; the upper lip 2-, the lower 3-cleft. Standard roundish ; 

 keel boat-shaped. Stamens diadelphous in two sets of 5 each. Pod flattened, 



