128 LEGUMINOS^E. ( PULSE FAMILY.) 



8. LUPIN US, Tourn. LUPINE. 



Calyx very deeply 2-lipped. Sides of the standard reflexed ; keel scythe- 

 shaped, pointed. Sheath of the monadelphous stamens entire ; anthers 

 alternately oblong and roundish. Pod oblong, flattened, often knotty by con- 

 strictions between the seeds. Cotyledons thick and fleshy. Herbs, with 

 palmately 1-1 5-f oliolate leaves, stipules adnate to base of the petiole, and 

 showy flowers in terminal racemes or spikes. (Name from Lupus, a wolf, 

 because these plants were thought to devour the fertility of the soil.) 



1. L. perennis, L. (WILD LUPINE.) Perennial, somewhat hairy; stem 

 erect (1-2); leaflets 7 - 1 1 , oblanceolate ; flowers in a long raceme, showy, 

 purplish-blue (rarely pale) ; pods broad, very hairy, 5 - 6-seeded. Sandy soil, 

 N. Eug. to Minn., Mo., and south to the Gulf. Var. OCCIDENTALS, Watson, 

 has stems and petioles more villous. Mich, and Wise. 



2. L. pusillus, Pursh. Annual, low, villous ; leaflets usually 5 ; racemes 

 short, sessile ; flowers purple or rose-color ; pods oval, hirsute, 2-seeded. 

 Central part of the Dakotas and Kan., and westward. 



9. TBIFOLIUM, 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 ob- 

 tuse. 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 pin- 

 nately 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. ARVENSE, 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.) 



H- - 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. PRATENSE, L. (RED C.) Stems ascending, somewhat hairy; lea/Jets 

 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. MEDIUM, 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. refl^xum, 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 Out. to Iowa, Kan., and southward. 



