508 LEGUM1NOSAE (PULSE FAMILY) 



green branches, leaves mostly digitately 3-foliolate, and large bright yellow 

 flowers. (The ancient Roman name of a plant, probably a Medicago.) 



1. C. SCOPARIUS (L.) Link. (SCOTCH B.) Glabrous or nearly so, about 1 

 m. high; leaflets small, obovate, often reduced to a single one ; flowers solitary 

 or in pairs, on slender pedicels, in the axils of the old leaves, forming leafy 

 racemes along the upper branches ; style very long and spirally incurved. 

 (Sarothamnus Wimmer.) Sandy barrens, etc., N. S. ; s. e. Mass, to Va., and 

 southw. May, June. (Nat. from Eu.) 



16. tTLEX L. FURZE. GORSE 



Calyx deeply 2-lipped. Standard ovate ; wings and keel oblong, of about 

 equal length. Stamens monadelphous. Pod short-oblong. Low densely 

 branched shrubs with spine-like phyllodial leaves. (An ancient name, used 

 by Pliny for some not certainly identified plant.) 



1. U. EUROPAEUS L. Calyx large, yellow, tomentulose. Sometimes culti- 

 vated as a sand-binder and now somewhat extensively established locally near 

 the coast from Nantucket to Va. (Introd. from Eu.) 



17. LUPiNUS [Tourn.] L. 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 1-15-foliolate 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. perSnnis L. (WILD L.) Perennial, somewhat hairy; stem erect, 

 3-6 dm. high; leaflets 7-11, oblanceolate ; flowers in a long raceme, showy, 

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

 s. w. Me. to Minn., and s. to the Gulf. May, June. Var. OCCIDENTALS Wats. 

 has stems and petioles more villous. Mich., n. Ind. (C. P. Smith), and Wise. 



18. TRIF6LIUM [Tourn.] L. CLOVER. TREFOIL 



Calyx persistent, 5-cleft, the teeth usually 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 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.) 



a. Flowers sessile in dense heads. 



Calyx-teeth silky-plumose, surpassing the corolla . . . 1. T. arvense. 



Calyx-teeth cilia'te, villous, or glabrous, surpassed by the corolla. 



Heads cylindrical ; corolla scarlet to deep red 2. T. incarnatum. 



Heads globose or ovoid ; corolla magenta or purple (rarely white). 



Calyx soft-hairy 3. T. pratense. 



Calyx nearly glabrous 4. T. medium. 



a. Flowers pedicellate, in looser heads ; pedicels reflexed in age 6. 

 6. Corolla white, roseate, or purple c, 

 c. Calyx-teetli bristle-tipped. 

 Calyx villous or hispid. 



Leaflets narrowly oblong 5. T. virginieum. 



Leaflets obovate 6. T. reflexum. 



Calyx essentially glabrous. 

 Stoloniferous. 

 Flowers 1-1.8 cm. long; corolla red ; peduncles rarely more 



than twice the length of the head 7. T. stoloniferum. 



