128 LEGUMINOS^.. (pulse FAMILY.) 



8. LUPIN US, Tourn. Lupixe. 



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 w^olf, 

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



1. L. perennis, L. (Wild Lupixe.) 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. occidentAlis, Watsou, 

 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 Dak. and Kan., and westward. 



9. TRIFOLIUM, 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 awai/ 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. (Xat. from Eu.) 



•<- -t- Cali/x scarceli/ hairjj 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 ; leaflets 

 oral or oboirate, 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 ichen old; corolla ichite or rose-color, withering-persistent 



and turning brownish in fading ; the tubular portion short. 



1. T. reflexum, L. (Buffalo C.) Annual or biennial ; stems ascending, 



downy ; leaflets obovate-oblong, finely toothed ; stipules thin, ovate ; standard 



rose-red, wings and keel whitisli ; calyx-teeth hairy ; pods 3 - 5-seeded. — 



Western N. Y. and Ont. to Iowa, Kan., and southward. 



