FLOWERING PLANTS AND FERNS OF ARIZONA 701 



Coconino, Yavapai, and Pima Counties. Widely distributed 

 throughout the range of the genus. 



Hosts numerous, mostly herbaceous, including grasses. If this 

 species has any host preference it is for clover, alfalfa, and other 

 legumes, and probably its wide distribution is due to association of 

 its seeds with those of such economically important hosts. Pedicels 

 mostly shorter than the flowers, which are yellow when dry and mostly 

 about 2 mm. long; calyx lobes broadly ovate to oval-ovate, almost 

 enclosing the corolla tube; corolla campanulate, enlarging about the 

 base of the rapidly developing capsule, which becomes up to 4 mm. 

 wide; scales abundantly fringed; styles slender, scarcely subulate; 

 capsules mostly wider than long. 



3. Cuscuta calif ornica Choisv, Soc. Phvs. Hist. Nat. Geneve Mem. 9: 



279. 1841. 



Topock, Mohave County (Eastivood 8907). Common in the Pacific 

 Coast States, especially California, but apparently rare in Arizona. 



Host plants include: Eriogonum, Abronia, Dalea, Foeniculum, 

 Asclepias, Franseria. An attractive species, easily recognized by the 

 lanceolate, reflexed corolla lobes, and the absence of infrastamineal 

 scales. 



4. Cuscuta indecora Choisy, Soc. Phys. Hist. Nat. Geneve Mem. 9: 



278. 1841. 



Yavapai, Gila, Maricopa, Pinal, and Pima Counties. Southern 

 and western United States, Mexico, West Indies, and South America. 



This species occurs on a great variety of both woody and herbaceous 

 hosts including Crossosoma, Acacia, Prosopis, Sapindus, Condalia, 

 Solidago, Aster, Hymenoclea, Baccharis, and Pluchea. Though named 

 indecora, the plant is ordinarily attractive with its abundant, white, 

 fleshy, and more or less papillate flowers. Styles about as long as 

 the somewhat pointed ovary, becoming divaricate on the globose 

 capsule, which is enveloped by the withered corolla. 



5. Cuscuta coryli Engelm., Amer. Jour. Sci. 43: 337. 1842. 



Grand Canyon, Coconino County (Eggert in 1886). Eastern 

 United States to Montana and northern Arizona, more common 

 eastward. 



This dodder occurs on a great variety of woody and herbaceous hosts 

 including Salix, Rhus, Ceanothus, Daucus, Stachys, Symphoricarpos, 

 Solidago, Aster, Helianthus, and Chrysanthemum. Flowers about 2 

 mm. long, on pedicels longer or shorter than the flowers, or the flowers 

 originating endogenously; calyx lobes triangular-ovate, about reaching 

 the sinuses of the corolla or somewhat longer; corolla lobes triangular- 

 ovate or more or less lanceolate; scales mostly reduced to toothed 

 wings along the line of attachment of the filaments but sometimes 

 free, and bifid or toothed; stamens nearly as long as the corolla 

 lobes; styles shorter than or equaling the globose-ovoid ovary, becoming 

 divergent in fruit; capsule depressed-globose, enveloped by the 

 withered corolla. 



6. Cuscuta salina Engelm. in A. Gray, Bot. Calif. 1: 536. 1876. 

 Pinal and Pima Counties. British Columbia to Arizona and 



southern California. 



Host plants include Atriplex, Suaeda. Allenroljea, Salsola, Xitro- 

 ph'da, and Cressa. Flowers 2 to 3 mm. long, narrowly campanulate, 



