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 adnate stipules; pinnate leaves of many leaflets; peduncles scape-like, bearing a head or short spike of flowers. (Name from ὀξύς, _sharp_, and τρόπις, _keel_.) [*] _Leaves simply pinnate._ 1. O. campéstris, DC., var. cærùlea, 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. Lambérti, Pursh. _Silky with fine appressed hairs_; leaflets mostly linear; flowers larger, purple, violet, or sometimes white; _pods cartilaginous or firm-coriaceous_ in texture, silky-pubescent, strictly erect, cylindraceous-lanceolate 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, mostly in fascicles of 3 or 4 or more along the rhachis._ 3. O. spléndens, Dougl. Silvery silky-villous (6--12´ high); scape spicately 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. GLYCYRRHÌZA, Tourn. LIQUORICE. Calyx with the two upper lobes shorter or partly united. Anther-cells confluent 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 γλυκύς, _sweet_, and ῥίζα, _root_); herbage glandular-viscid; leaves odd-pinnate, with minute stipules; flowers in axillary spikes, white or bluish. 1. G. lepidòta, 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, Ont. 24. ÆSCHYNÓMENE, 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, composed of several easily separable joints.--Leaves odd-pinnate with several pairs of leaflets, sometimes sensitive, as if shrinking from the touch (whence the name, from αἰσχυνομένη, _being ashamed_.)