26 ANALYTICAL KEY 



base within. LITHOSPERMTTM CANESOENS (p. iii). 



m. Ovary not four-lobed. 

 n. Ovary i-celled. 

 0, Leaves entir'e; style single. 



Star Flower, TRIENTALIS AMERICANA (p. los). 

 u, Leaves cut-toothed or lobed; style two-cleft (Water-leaf), 

 p. Calyx with a reflexed lobe at each sinus; plant hairy. 



HYDROPHYLLUM APPENDICULATUM (p. 109). 

 p. Calyx without a reflexed lobe at the sinus; plant smoothish. 

 q,, Leaves pinnately divided; peduncles longer than the upper 

 petioles. HYDROPHYLLTTM VIRaiNIANUM (p. 109).' 



q. Leaves palmately lobed; peduncles shorter than the petioles. 

 HYDROPHYLLUM OANADENSE (p. 109). 

 n. Ovary 2-celled. 

 o. Low white-flowered annual of fields and waysides. 



Purslane Speedwell, VERONICA PEREGrRINA (p. 114). 

 o. Tall woodland perennial with blue flowers. 



Nightshade, SOLANUM DULCAMARA (p. 112). 

 h* Corolla more or less irregular (syg amorphic), its divisions dissimilar 

 in size or shape. 

 i. Plants without green leaves (Orobanchaceae). 

 j. Flowers numerous in a thick spike; stamens exserted. 



Cancer-root, CONOPHOLIS AMERICANA (p. 115). 

 j. Flowers solitary; stamens included. 



Broom-rape. OROBANCHE UNIFLORA (p. X15). 

 1. Plants with green leaves. 

 j. Leaves compound Cp. 27). 

 k. iL-eaves without stipules. 

 1. Sepals two; corolla white, heart-shaped or spurred; stamens six 

 iDicentra). 

 m. Underground stem a granulate bulb; corolla with two divergent 

 spurs. Dutchman's Breeches, DICENTRA CUCULLARIA (p. 69). 

 m. Underground stem with scattered grain-like tubers; corolla heart- 

 shaped. Squirrel Corn, DICENTRA CANADENSIS (p. 70). 

 1. Sepals united, teeth inevident; corolla bilabiate; stamens four. 

 Lousewort, PEDICULARIS CANADENSIS (p. 114). 

 k. Leaves with stipules; calyx and corolla each with five parts; 

 stamens ten (Leguminosae) . 

 1. Leaves 7—11 foHolate; flowers purplish-blue. 



Common Lupine, LUPINUS PERENNIS (p. 82). 

 1. Leaves 7— 11 foliolate; flowers purplish-blue. 

 m. Flowers in heads (.Clover). 

 n. Flowers sessile, red to rose-colored. 



Red Clover, TRIFOLIUM PRATENSE (p. 83). 

 n. Flowers pedicelled, pedicels reflexed in age. 

 0. Plants creeping, the stems rooting freely; flowers white. 



White Clover, TRIFOLIUM BEPENS (p. 83). 

 0. Stems ascending, not rooting; flowers pink. 



Alsike Clover, TRIFOLIUM HYBRIDUM (p. 83), 

 zn. Flowers in racemes (Sweet clover) (p. 27). 

 It. Flowers yellow. 



Yellow Sweet Clover. MELILOTUS OFFICINALIS (p. 83). 

 n. Flowers white. 



