FLOWERING PLANTS AND FERNS OF ARIZONA 703 



corolla tube, bridged at about the middle; styles longer than the 

 globose ovary, becoming divergent in fruit; capsule globose, thin 

 toward the base, bearing the withered corolla about the middle or 

 at top. 



11. Cuscuta applanata Engelm., Acad. Sci. St. Louis Trans. 1: 479. 



1859. 



Coconino, Cochise, and Santa Cruz Counties, type from "Arizona 

 Territory south of the Gila River" (Wright 541). New Mexico, 

 Arizona, and Mexico. 



Hosts various, including Boerhaavia and Ambrosia. Flowers in 

 dense clusters; corolla lobes oblong to ovate-lanceolate, spreading; 

 scales exserted, fringed; capsules globose-depressed, thin, readily 

 circumscissile. 



12. Cuscuta odontolepis Engelm., Acad. Sci. St. Louis Trans. 1: 486- 



1859. 



Santa Rita Mountains (Pima County), on various hosts including 

 Amaranthus, type from "near a deserted rancho on a rocky hillside in 

 Arizona" (Wright 1624). Southern Arizona and Sonora. 



Flowers 4 to 5 mm. long, short-pedicellate, forming rather large, 

 dense clusters; corolla cylindric-campanulate, the lobes ovate-lanceo- 

 late, acute; scales oblong or subspatulate, dentate near the apex only; 

 styles slender, mostly longer than the ovary; capsule globose. 



13. Cuscuta dentatasquamata Yuncker, Torrev Bot. Club Bui. 49: 



107. 1922. 



Florida Canyon, Santa Rita Mountains, Pima County (Kearney 

 and Peebles 10580), on Bouvardia. A rare species known elsewhere 

 only from Los Pinitos, Sonora, the type locality. 



Flowers pedicellate, somewhat fleshy; calyx deep, the lobes equaling 

 or exceeding the corolla tube; corolla campanulate, the lobes triangular, 

 acute, shorter than the tube, spreading; scales oblong, dentate; styles 

 slender, slightly subulate, about equaling or longer than the depressed- 

 globose ovary; capsule depressed-globose, thin, somewhat irregularly 

 circumscissile. 



14. Cuscuta umbellata H. B. K., Nov. Gen. et Sp. 3: 121. 1818. 

 Pinal, Pima, and Cochise Counties. Southern United States to 



Arizona, West Indies, Mexico, and northern South America. 



On a variety of herbaceous hosts including Polygonum, Atriplex, 

 Suaeda, Achyranthes, Amaranthus, Boerhaavia, Trianthema, St such/,,,, 

 Kallstroemia, and Euphorbia. Flowers in compound cymes, the 

 ultimate divisions of these umbellate, of 3 to 7 flowers; calyx turbinate, 

 yellow and shining when dry; corolla lobes lanceolate, acute to acu- 

 minate, reflexed; styles longer than the globose ovary; capsule de- 

 pressed-globose, surrounded by the withered corolla. Specimens 

 bearing unusually large flowers (4 to 6 mm. long) have been dis- 

 tinguished as variety reflexa (Coult.) Yuncker (C. caMfornica var. 

 reflexa Coult.). 



15. Cuscuta tuberculata T. S. Brandeg., Calif. Univ. Pubs. Bot, 3: 



389. 1909. 

 Pinal and Pima Counties. Southwestern New Mexico, southern 

 Arizona, and northwestern Mexico. 



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