310 CONVOLVULUS FAMILY. 



5. EVOLVULUS. (From Latin fur unroU ; that is, it does not twine.) 

 Low and diminutive small-flowered plants. Flowers summer. 2/ 



B. arg^nteus, Pursh. Tufted from a woody base, 5'-7' high, silky- 

 woolly all over ; broadly lanceolate leaves crowded, usually nearly sessile, 

 as are the flowers in their axils; corolla iiurple, \' i)road. Plains, 

 Dak., S. 



E. serlceus, Swartz. Damp ground Fla., W.; slender-stemmed, silky 

 with fine appressed hairs, except the upper face of the scattered lance- 

 linear leaves ; corolla white or bluish, not \' broad. 



6. CUSCUTA, DODDER. (Old name, of uncertain derivation.) 

 Plants resemble threads -of yarn, yellowish or reddish, spreading over 

 herbs and low bushes, coiling around their branches, to which they 

 adhere, robbing them of their juices. Flowers small, mostly white, 

 clustered. 



» Stigmas slender ; pnd opening bij a trnnsverse division all ronnd near 

 the base, leaving the partition behind. Xatives of En. ; Jloicers early 

 summer. 



C. Epilinum, Weihe. Flax Doohkr. Growing on flax, which it 

 injures ; occasionally found in our flax flelds ; flowers globular, in scat- 

 tered heads ; corolla 5-parted. 



* * Stigmas capitate ; pods bursting in'egularly if at all; icild species of 

 the country, mostly in rich or low ground ; flowers summer and 

 autumn, (j) 



-1- Sepals united; ovary and pod deptressed-globose. 



■w- Plovers sessile in compact mostly continrions clusters; corolla icith a 

 short and itjide tube, remaining at the base of the ripe pod ; styles usually 

 shorter than the ovary. 



C. arv^nsis, Beyr. On low herbs, in fields and barrens from N. Y., S. 

 and W.; flowers earliest (June, July) and smallest; tube of corolla 

 shorter than its 5 lanceolate, pointed, spreading lobes, much longer than 

 the stamens. 



C. ohlorocdrpa, Engelm. On low herbs, in wet soil, from Del., W. 

 and S. \V.; orange-colored ; open bell-shaped corolla with lobes about the 

 length of the mostly 4 acute lobes and the stamens ; pod lai'ge, depressed, 

 greenish-yellow. 



++ -w- Flowers panicled or in compound cymes, the icithered corolla re- 

 maining on the top of the pod ; styles mostly longer than the ovary. 



C. tenuifl6ra, Engelm. On shrubs and tall herbs, Pa., W. and S., in 



swamps ; pale ; tube of tlie corolla twice the length of its ovate, acute, 

 spreading lobes, and of the ovate blunt calyx lobes. 



H- ■■■- Sepals united ; ovary a)id pod pointed. 



C. inflexa, Engelm. On shrubs and tall herbs in prairies and barrens, 

 N. Eng., W. and S. ; ftoroUa fleshy, mostly 4-cleft, its tube no longer than 

 the ovate, acutish, crenulate, erect or inflexed lobes of the corolla and 

 the acute, keeled calyx lobes. 



C. dec6ra, Engelm. Wet prairies 111., S. W. ; with larger flowers, the 

 corolla broadly bell-shaped, its 5 lobes lance-ovate, acute, and inflexed. 



C. Gron6vii, Willd. The commonest E. and W.; on coarse herbs and 

 low shrubs in wet places ; bell-shaped corolla with tube usually longer 

 than its 5 (i-arely 4) ovate blunt spreading lobes ; its internal scales large 

 and copiously fringed. 



