678 CUSCUTACEAE 



Capsule 5-6 mm. broad; inflorescence globular clusters. 



14. C. megalocarpa. 



Calyx of 5 almost distinct and overlapping sepals, subtended by 2 or more similar 

 bracts. 15. C. cuspidata. 



1. C. gracilis Rydb. Stem filiform, about 0.25 mm. in diameter; flowers in 

 dense globular clusters; calyx gamosepalous but cleft to near the base; lobes 

 ovate; corolla less than 2 mm. high; lobes ovate, widely spreading, acute; scales 

 ovate, crenate, almost half as long as the corolla-tube; capsule about 2 mm. 

 high, acute-globose, circumscissile near the base. Parasitic on Eriogonum, Chry- 

 sothamnus, Solanum, etc.: Wyo. Plain Submont. Je. 



2. C. planiflora Tenore. Stem filiform, reddish; flowers in dense glomerules, 

 5-10 mm. in diameter; calyx obconic; lobes round, short, obtuse, carinate beneath; 

 corolla-tube very short; lobes 5, always reflexed, ovate, apiculate. C. epilinum 

 and C. epithymum of western reports. Parasitic on alfalfa and other herbs: 

 Colo. Wyo. Utah Mont.; introduced in alfalfa from s Eu. Je-Au. 



3. C. Anthemi A. Nels. Stem filiform, 2-3 dm. long; flowers sessile in small 

 capitate clusters; calyx-lobes broadly ovate, acute; corolla less than 2 mm. long, 

 broadly campanulate; lobes ovate, acute, equalling or exceeding the tube; scales 

 oval, fringed; capsule globose, 1 mm. thick. Parasitic on Artemisia: Wyo. 



4. C. umbellata H.B.K. Stem capillary, low; flowers few, umbellate; calyx- 

 lobes lanceolate, acute; corolla 3-4 mm. long, campanulate; lobes lanceolate- 

 subulate; scales deeply fringed, exceeding the tube; capsule capped by the re- 

 mains of the corolla. On Amaranthaceae, Portulacaceae, Zygophyllaceae, Nycta- 

 ginaceae, and rarely Compositae: Tex. Colo. Ariz.; Mex. and W. Ind. Son. 



5. C. calif ornica Choisy. Stems very slender, filiform; flower-clusters 

 rather open; pedicels slender but short; calyx turbinate, the lobes triangular or 

 lanceolate; corolla-lobes lance-linear, in fruit mostly erect and connivent; scales 

 wanting; capsule enveloped by the corolla. On herbs of arid regions, Eriogonum, 

 etc.: Calif. Utah Ariz. Son. My-Au. 



6. C. arvensis Beyr. Stems slender; flowers in head-like clusters, sessile, 

 less than 2 mm. long; calyx-lobes rounded, obtuse; corolla-lobes longer than the 

 tube, acute or acuminate, triangular; scales large and deeply laciniate. On var- 

 ious herbs: Mass. Fla. Calif. B.C.; Mex. and W. Ind. Plain Submont. 

 Ap-N. 



7. C. cephalanthi Engelm. Stem filiform; flowers cymose-paniculate, 

 about 2 mm. long, 4-merous, or even 3-merous; corolla deeply campanulate; 

 scales ovate or spatulate; capsule 2-2.5 mm. in diameter. C. tenuiflora Engelm. 

 On coarse herbs and shrubs: Pa. Tex. Sask. Plain. Je-S. 



8. C. plattensis A. Nels. Stem yellowish green; flowers densely or loosely 

 cymose, short-pedicelled; calyx-lobes suborbicular, obtuse, fully 1 mm. long; 

 corolla marcescent at the base of the capsule; lobes at first erect, at last reflexed; 

 scales broadest at the truncate fringed summit; capsule 5 mm. at maturity, inde- 

 hiscent. On Grindelia, Solidago, Helianthus and other Composites : Wyo. Jl-Au. 



9. C. denticulata Engelm. Stem capillary-filiform; flowers few in small 

 clusters; corolla-tube included in the calyx; lobes rounded-ovate, less than 1 mm. 

 long; scales reaching to the base of the stamens, denticulate at the rounded apex; 

 capsule covered by the marcescent corolla, ovoid. On herbs and low shrubs: 

 Utah Nev. 



10. C. Gronovii Willd. Stem rather coarse, high-climbing; flowers panicu- 

 late-cymose; calyx-lobes elliptic; corolla deeply campanulate; lobes elliptic, 

 obtuse, spreading, flat; scales ovate, fringed, spreading; capsule broadly ovoid, 

 4-5 mm. in diameter. On coarse herbs or shrubs: N.S. Fla. Tex. Colo. 

 N.D. Man. Plain. Jl-O. 



11. C. curta (Engelm.) Rydb. Stems rather slender; flowers in small 

 cymes; calyx short; lobes rounded, obtuse; corolla deeply campanulate, 3 mm. 

 long; lobes short, broadly oval; scales short, bifid or truncate, appressed to the 

 tube; capsule ovoid, the marcescent corolla surrounding or covering the upper 

 portion. On coarse herbs: Colo. Utah Nev. Au. 



