128 LEGUMINOSjE. (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 bv con- 

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

 palmately 1 - 15-foliolate leaves, stipules ad n ate to base of the petiole, and 

 showy Mowers in terminal racemes or spikes. (Name from Lujius, a wolf, 

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



1. L. per6nnis, L. (Wn.D LITINE.) 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. OCCIDENTALS, Watson, 

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



2. L. pusillus, Pursli. 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. TRIFOLIUM, Tourn. CLOVER. TREFOIL. 



Calyx persistent, 5-cleft, the teeth bristle-form. Corolla mostty 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 bv 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 </<.>-< Irmh ; rurn/ln purple or purplish, u-illu rimi <n.cai/ after 



flowering, tubular below, the petals more or less coherent with each other. 



+- Calyr-teeth silky-plumose, longer than the whitish corolla ; root annual. 



T. ARVENSE, L. (R AUDIT-FOOT or STOXE CLOVER.) Silky, branching 

 (5-10' high); leaflets oblanceolate ; heads becoming very soft-silky and 

 grayish, oblong or cylindrical. Old fields, etc. (Nat. from En.) 



t- -- Cali/x scarce.!// hairy except <i bearded rim/ in t/x- t/inxit, s/n>rt> r than the rose- 

 purple elongated-tubular corolla. (Short-lived p< r< uninls ; flowers sweet-scented.) 



T. PRATENSE, 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. 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. refl6xum, 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. 



