113] NORTH AMERICAN AND WEST INDIAN CUSCUTA—YUNCKER 23 



C. gracilis Rydberg, Bull. Torr. Bot. Club, 28:501, 1901. 

 C. anthcmi Nelson, Bot. Gaz., 37:277, 1904. 



For the Old World synonymy see Engelmann, Trans. Acad. Sci. 

 St. Louis, 1:464, 1859. Our form appears to be the same as C. planiflora 

 approximata Engelmann, but in the absence of sufficient foreign materials 

 for study this cannot be stated for a fact. 



Stems slender. Flowers glabrous, about 2 mm. long, membranaceous 

 or somewhat fleshy, white, sessile, in dense globular clusters; calyx lobes 

 as long as the corolla, broadly ovate, overlapping, somewhat keeled, 

 fleshy pointed at the apex; corolla tube cylindrical, becoming urceolate 

 in fruit; lobes spreading, oval, obtuse to slightly acutish; scales ovate, 

 about reaching the filaments, crenulate about the upper portion, bridged 

 somewhat below the middle; stamens shorter than the lobes; filaments 

 slightly subulate, as long as or longer than the oval, sagittate, versatile 

 anthers; ovary globose; styles slightly subulate, equal, (including the 

 stigmas) longer than the ovary; stigmas curving and reddish, about as 

 long as the styles. Capsule globose, circumscissile, the withered corolla 

 carried at the apex; seeds about 1 mm. long, light brown, finely punctated 

 and more or less scurfy, usually four in a capsule, oval, or somewhat oblong, 

 angled, rather robust; hilum short, oblong, transverse or oblique, some- 

 times scarcely visible. 



Type locality: Probably near Naples, Italy. Type not seen. Range 

 in North America: Throughout most of the western states from Wash- 

 ington and Wyoming south to Colorado and New Mexico, mainly on 

 leguminous hosts. 



Specimens examined: United States: Wyoming; Between Sheridan and Buffalo 

 (Tweedy 3492, the type of C. gracilis, in the N. Y. Bot. Gard. Herb.), Little Goose Fields 

 (Willets 558), Laramie (Nelson 1139, 1210), Teton Forest Reserve (Brandegee in 1897), 

 Wheatland (Fay in 1914), Seminole Mts. (Nelson 4936, the type of C. anthemi, in the Rky. 

 Mt. Herb. Univ. Wyo.). Utah; Salt Lake City (Garrett 1002, Smith 1831), Ogden (Tracy & 

 Evans in 1887), Provo (Tracy in 1887), Little Springs (Rydberg & Garrett 8541), without 

 indication of locality (Hillman in 1899). Nevada; Reno (Heizer 345, Hillman), Ormsby Co. 

 (Baker 1477), Nevada City (Hurst in 1890). Colorado; Fort Collins (without indication of 

 collector 4222). Washington; Cascade Mts. (Kammerer 98). Oregon; Powder River Valley 

 (Cusick 2341). New Mexico; San Juan Co. (Standley 8058). California; Siskiyou Co. 

 (Brown 492), Yreka (Butler 536). 



Cuscuta europaea Linnaeus 

 [Figures 5, 85 and 144] 

 C. europaea Linnaeus, Spec. PI., p. 124, 1753. — Engelmann, Trans. Acad. Sci. St. Louis, 

 1:468, 1859. 



No American synonymy. For the foreign synonymy see Engelmann, Trans. Acad. Sci. 

 St. Louis, 1:468, 1859. 



Stems medium to slender. Flowers about 2-3 mm. long on short, 

 thick pedicels in globular, compact clusters, glabrous, mostly tetramerous, 

 infrequently tri- or pentamerous; calyx lobes ovate, obtuse, shorter than 



