1. L. perénnis, L. (WILD LUPINE.) Perennial, somewhat hairy; stem erect (1--2°); leaflets 7--11, oblanceolate; flowers in a long raceme, showy, purplish-blue (rarely pale); pods broad, very hairy, 5--6-seeded.--Sandy soil, N. Eng. to Minn., Mo., and south to the Gulf.--Var. OCCIDENTÀLIS, Watson, has stems and petioles more villous.--Mich. and Wisc. 2. L. pusíllus, Pursh. Annual, low, villous; leaflets usually 5; racemes short, sessile; flowers purple or rose-color; pods oval, hirsute, 2-seeded.--Central Dak. and Kan., and westward. 9. TRIFÒLIUM, Tourn. CLOVER. TREFOIL. Calyx persistent, 5-cleft, the teeth bristle-form. Corolla mostly withering or persistent; the claws of all the petals, or of all except the oblong or ovate standard, more or less united below with the stamen-tube; keel short and obtuse. Tenth stamen more or less separate. Pods small and membranous, often included in the calyx, 1--6-seeded, indehiscent, or opening by one of the sutures.--Tufted or diffuse herbs. Leaves mostly palmately, sometimes pinnately 3-foliolate; leaflets usually toothed. Stipules united with the petiole. Flowers in heads or spikes. (Name from _tres_, three, and _folium_, a leaf.) [*] _Flowers sessile in dense heads; corolla purple or purplish, withering away after flowering, tubular below, the petals more or less coherent with each other._ [+] _Calyx-teeth silky-plumose, longer than the whitish corolla; root annual._ T. ARVÉNSE, L. (RABBIT-FOOT or STONE CLOVER.) Silky, branching (5--10´ high); leaflets oblanceolate; heads becoming very soft-silky and grayish, oblong or cylindrical.--Old fields, etc. (Nat. from Eu.) [+][+] _Calyx scarcely hairy except a bearded ring in the throat, shorter than the rose-purple elongated-tubular corolla. (Short-lived perennials; flowers sweet-scented.)_ T. PRATÉNSE, L. (RED C.) Stems ascending, somewhat hairy; _leaflets oval or obovate, often notched_ at the end and marked on the upper side with a pale spot; _stipules broad, bristle-pointed; heads ovate, sessile_.--Fields and meadows; largely cultivated. (Adv. from Eu.) T. MÈDIUM, L. (ZIGZAG C.) Stems zigzag, smoothish; _leaflets oblong, entire_, and spotless; _heads mostly stalked_; flowers deeper purple, otherwise too like the last.--Dry hills, N. Scotia to E. Mass. (Adv. from Eu.) [*][*] _Flowers pedicelled in umbel-like round heads on a naked peduncle, their short pedicels reflexed when old; corolla white or rose-color, withering-persistent and turning brownish in fading; the tubular portion short._ 1. T. refléxum, L. (BUFFALO C.) Annual or biennial; _stems ascending, downy; leaflets obovate-oblong_, finely toothed; stipules thin, ovate; standard rose-red, wings and keel whitish; calyx-teeth hairy; pods 3--5-seeded.--Western N. Y. and Ont. to Iowa, Kan., and southward.