with pedicels about as long as the flowers or commonly somewhat shorter, in 

 loose cymose clusters; calyx mostly about as long as and loose about the corolla 

 tube; calyx lobes broadly ovate, obtuse, commonly as broad as or broader than 

 long, often unequal, widely overlapping at the sinuses to form 5 conspicuous 

 angles; corolla lobes lanceolate, about as long as or slightly longer than the tube, 

 spreading or reflexed. the acute tips inflexed; scales ovate-oblong, reaching the 

 filaments, prominently fringed; styles slender, about equal to or slightly shorter 

 than the ovary; capsule mostly more or less depressed-globose to somewhat ovoid, 

 frequently longer than wide, the withered corolla remaining about the lower part. 

 Frequent in the e. part of the U.S., w. to Okla., Tex., Colo., Mont, and Calif.; 

 parasitic on species of Justicia, Hibiscus, Solidago, Aster, Ambrosia, Artemisia 

 and many others. 



7. Cuscuta campestris Yunck. Field dodder. Fig. 640. 



Flowers to about 2.5 mm. long from base to corolla sinuses, appearing much 

 larger when in fruit, smooth or with scattered pellucid glandlike cells, with 

 pedicels mostly shorter than the flowers, in glomerate-cymose clusters; calyx lobes 

 about as long as the corolla tube, overlapping at the base but not markedly angled 

 at the sinuses, ovate to oval-ovate, commonly as long as wide, obtuse; corolla lobes 

 triangular to sublanceolate, about as long as the tube, spreading to reflexed, 

 often granulate, the acute tips inflexed; scales reaching the filaments, ovate- 

 oblong, abundantly fringed; style slender to slightly subulate, as long as or 

 longer than the ovary; capsule depressed-globose, the withered corolla remaining 

 about the lower half. C arvensis Engelm. 



Throughout Tex., Okla. (Craig Co.) and Ariz. (Coconino, Yavapai and Pima 

 COS.), distributed over the range of the genus; parasitic on a great variety of 

 mostly herbaceous hosts including species of Justicia, Xanthium, Penthorum, 

 Ludwigia and Trifolium. 



8. Cuscuta glabrior (Engelm.) Yunck. var. glabrior. Fig. 641. 



Flowers about 2 mm. long from base to corolla sinuses, white or often reddish, 

 commonly with numerous pellucid glandlike cells, subsessile or mostly with 

 pedicels no longer than the flowers or rarely longer, in compact or loose globular- 

 cymose clusters; calyx lobes as long as or somewhat shorter than the corolla tube, 

 ovate to oval-ovate, commonly not overlapping at base, the sinuses often obtusish; 

 corolla lobes triangular to sublanceolate, smooth or commonly more or less 

 papillate, about as long as the tube, spreading to reflexed, the acute to acuminate 

 tips inflexed; scales reaching the filaments, oblong-spatulate, abundantly fringed; 

 styles as long as or somewhat longer than the ovary that is more or less scabrous- 

 papillate; capsule depressed-globose, the interstylar aperture large, often with 

 numerous pellucid glandlike cells, scabrous-papillate at least above the middle, 

 rarely smooth, sometimes easily breaking loose from the calyx and thus may be 

 mistaken as circumscissile, surrounded by the withered corolla. 



Frequent in Tex., ranging from N. M. (Chaves Co.) to Okla. (Waterfall) and 

 La., s. into n.e. Mex.; parasitic on a variety of mostly herbaceous hosts including 

 species of Amaranthus. Oenothera, Gaura, Verbena, Plantago, Aster, Ambrosia, 

 Bifora, Liatris. Phyllanthus, Asclepias and Justicia. 



Var. pubescens (Engelm.) Yunck. All parts of the flower (including ovary 

 and capsule) and pedicel more or less densely papillate; otherwise similar to var. 

 glabrior. 



9. Cuscuta salina Engelm. Fig. 642. 



Flowers 2-4 mm. long, 5-parted, on pedicels mostly shorter than the flowers, 

 in umbellate-cymose clusters; calyx lobes ovate-lanceolate, acute to acuminate, 

 about as long as the corolla tube; corolla lobes about as long as the campanulate 



1365 



