22 ILUNOIS BIOLOGICAL MONOGRAPHS [112 



Key to the species 

 Styles, including the stigmas, exceeding the length of the ovary. 



Calyx lobes triangular-ovate, acute, scarcely overlapping C. epithymum (p. 22). 



Calyx lobes broadly ovate, somewhat fleshy pointed at the apex, overlapping 



C. planiflora (p. 22). 



Styles, including the stigmas, not exceeding the length of the ovary. 



Flowers usually tetramerous, capsule pointed, calyx lobes not overlapping 



C. europaea (p. 23). 



Flowers usually pentamerous, capsule depressed, calyx lobes overlapping 



C. epilinum (p. 24). 



Cuscuta epithymum Murray 

 [Figures 2, 86 and 145] 

 C. epithymum Murray, Linn. Syst. (13 ed.), p. 140, 1774. — Engelmann, Trans. Acad. Sci. 

 St. Louis, 1:461, 1859.— Hillman, Nev. Agr. Exp. Sta. Bull., No. 15, fig. 3, 1892.— Piper, 

 Wash. Agr. Exp. Sta. Bull., No. 8, fig. 1, 1893.— Matthew, Bull. Torr. Bot. Club, 20, 

 pi. 164, fig. 2, 1893.— Tourney, Ariz. Agr. Exp. Sta. Bull., No. 22, fig. 9, 1897.— Britton 

 & Brown. Illustr. Flora, 3:27, fig. 2956, 1898; 2 ed., 3:49, fig. 3443, 1913. 

 Lepimes epithymum Rafinesque, Fl. Tellur., 4:91, 1836. 



For European synonymy see Engelmann, Trans. Acad. Sci. St. Louis, 1:461, 1859. 



Stems slender, sometimes reddish or purplish. Flowers about 3 mm. 

 long, pentamerous, sessile and numerous in dense compact clusters; 

 calyx as long as or shorter than the corolla tube, the lobes triangular, 

 acute, sometimes purplish tipped; corolla campanulate; lobes triangular, 

 acute, spreading, shorter than the tube; scales more or less spatula te, 

 shorter than the tube, fringed about the upper part, bridged at about a 

 third of their height; stamens shorter than the lobes; filaments longer than 

 the oval anthers; ovary globose, with a slightly thickened apex; styles 

 and stigmas about twice as long as the ovary; stigmas filiform, slightly 

 longer than the style. Capsule globose, circumscissile, capped by the 

 withered corolla; seeds about 1mm. long, rather rough, angled, compressed, 

 ovate; usually four in a capsule; hilum short, oblong, transverse. 



C. trifolii, which is ordinarily considered as a synonjTn of C. epithymum, is believed by 

 Simkovics (Magyar Novenytani Lapok. Klausenburg, 2:145-153, 1878. Abs. in Just Bot. 

 Jahresb., 6M332, 1880) to be a hybrid of C epithymum and C. europaea. 



Type locality: The prototype of Bauhin probably from Switzerland. 

 Range: Throughout North America on leguminous hosts. 



Specimens examined: United States: Massachusetts; North Worcester (Lowe in 

 1916), Nantucket (Moore in 1918). Connecticut; Hartford (Bissell 1900, Parlin 875), South- 

 ington (Bissell 47, 78, 158). Vermont; Manchester (Day 409). New York; LeRoy (Hill 

 68-1909). Pennsylvania; Bethlehem (Bechdolt in 1889), Newcastle (Johnston in 1904). 

 JlfaryZan<?; Baltimore Co. (Schurtzin 1907). IficAJgan; Memphis (Ward), Shelby (Wear). 

 Missouri (Martin in 1889), Cassidy (Davis 561). Washington; Seattle (Piper in 1898). 



Mexico: Mexico (Pringle 8514). Coahuila; Saltillo (Hitchcock in 1910). 



Cuscuta planiflora Tenore 

 [Figures 4, 64 and 129] 

 C. planiflora'Tenoxe, Fl. Nap., 3:250, 1824-1829.— Engelmaim, Trans. Acad. Sci. St. Louis, 

 1:464,1859. 



