127] NORTH AMERICAN AND WEST INDIAN CUSCUTA—YUNCKER 37 



Anthers subsessile or sessile, flowers tetra- or pentamerous C. purpusii (p. 37). 



Anthers on filaments about as long as or longer than the anthers. 



Scales reaching the filaments, fringed, bridged at about the middle. 



Corolla cylindrical, lobes lanceolate, acuminate, without a dorsal pro- 

 jection C. choisiana (p. 38). 



Corolla campanulate, lobes ovate, obtusish, ordinarily with a dorsal 



projection C. odonlolcpis fimbriata (p. 39). 



Scales shorter than the tube, oblong, toothed about the apex, bridged below 



the middle C. odontolepis (p. 38). 



Flowers mostly smaller; calyx lobes overlapping in one species, not overlapping in the 

 others. 

 Styles not exceeding the ovary or capsule in length; scales rather sparingly fringed . . 



C. polosina (p. 39) . 



Styles longer than the ovary and capsule; scales ordinarily rather abundantly 

 fringed, but reduced to wings in one variety. 



Flowers reddish; corolla deeply furrowed along the stamen attachments 



C. partita (p. 40). 



Flowers whitish; corolla not deeply furrowed. 



Calyx segments not overlapping, as long as the corolla tube. 



Calyx segments lanceolate, acuminate, scales shorter than the tube, 



fringed or reduced to wings C. desmouliniana (p. 40). 



Calyx segments mostly triangular-acute to lanceolate; scales as long 

 as or exceeding the tube (shorter in one variety of C. umbellata 

 and reduced or absent in one variety of C. gracillima) 

 Corolla lobes entire. 



Flowers 2-7 mm. long; stamens shorter than the lobes; 

 scales bridged below the middle; flower clusters rather 

 loose and diffuse; stems profuse. . . . C. umbellata (p. 41). 

 Flowers about 2 mm. long; stamens longer or shorter than 

 the lobes; scales bridged at about the middle or reduced 

 in one variety; flower clusters globular; stems ordinarily 



disappearing from between the flower clusters 



C. gracillima (p. 43). 



Corolla lobes deeply serrated or lacerated. . . .C. lacerata (p. 44). 



Calyx segments overlapping, shorter than the corolla tube 



C. deltoidea (p. 44). 



Calyx much shorter than the elongated corolla. 



Calyx lobes keeled or tuberculate, pentamerous C. tuber culata (p. 45). 



Calyx lobes not keeled, penta- or tetramerous. 



Flowers 3-4 mm. long, calyx papillate; corolla papillate in basal portion, scales 



bridged at about the middle or below C. leplantha (p. 45). 



Flowers 4-5 mm. long; calyx and corolla glabrous; scales bridged at about a third 

 of their height C. polyanthemos (p. 46). 



Cuscuta purpusii n. sp. 

 [Figures 23 and 90] 

 Stems slender to medium. Flowers glabrous, pentamerous (infre- 

 quently tetra- or trimerous), about 4 mm. long, on pedicels as long as or 

 longer than the flowers in loose, few-flowered, cymose panicles; calyx nearly 

 as long as or longer than the corolla; lobes ovate-triangular, acute, some- 

 what lanceolate, slightly lobed at the base, overlapping, tips somewhat 



