PIPER FLORA OP THE STATE OF WASHINGTOISr. 455 



Capsule globose. 



Flowers sessile ; style shorter than the ovary 5. C. arvensis. 



Flowers pedicelled. 



Stems coarse ; calyx lobes obtuse 6. C. cephalanthi. 



Stems fine ; calyx lobes acute , . 7. C califomica. 



1. Cuscuta epithymum Murr.; L. Syst. ed. 13; 140. 1774. 

 Type locality: None given, but European. 



Specimens examined: Vashon Island, {rar^Zner 210; Seattle, Piper. 



2. Cuscuta planifiora Tenore, Fl. Nap. 3: 250. 1824-29. 

 Type locality: Near Isaples, Italy. 



Range: Introduced in the western United States. 

 Specimens examined: Entiat, Mr. Grover in 1898. 



That this species is perfectly distinct from C. epithymum has clearly been demonstrated 

 by the studies of Mr. F. H. Hillman. 



3. Cuscuta squamigera (Engelm.). 



Cuscuta californica squamigera Engelm. Trans. St. L. Acad. 1: 499. 1859. 



Cuscuta subinclusa abbreviata Engelm. op. cit. 500. 1859. 



Cuscuta saliva Engelm. in A. Gray, Bot. Cal. 1: 536. J876. 



Type locality: "Saline soil in the Rio Virgen, Utah, on Suaeda." 



Range: British Columbia to California and Arizona. 



Specimens examined: Port Angeles, Piper, September 1, 1895; Port Ludlow, Binns; 

 Coupeville, Gardner 218; Seattle, Piper in 1889; Shelton, Piper, August 10, 1899; Tacoma, 

 Flett 77. 



In Cooper's report this species was called C. umbrosa Beyrich. 



Zonal distribution: Humid Transition. 



4. Cuscuta indecora Choisy, Mem. Soc. Phys. Geneva 9: 278. 1841. 

 Type locality: "Hab. Mexicam ad Matamoras." 



Range: Washington to California, eastward to Illinois and Florida. 

 Specimens examined: Waitsburg, Homer, October 5, 1893, on alfalfa and prickly 

 lettuce. 



6. Cuscuta arvensis Beyrich; Hook. Fl. Bor. Am. 2: 77. 1838. 

 Type locality: "N.W.America." Collected by Douglas. 

 Range: Washington to New York, southward to California and Florida. 

 Specimens examined: Waitsburg, Horner, on alfalfa, October 5, 1893. 



5a. Cuscuta arvensis calycina Engelm. Trans. St. Louis Acad. 1: 495. 1859. 



Type locality: Texas. ' 



In the original description Engelmann includes Geyer'sno. 674, collected at the "mouth of 

 the Walla Walla River, on the muddy borders, infesting the stems of Xanthium microcarpon, 

 September." We have not seen this specimen nor do we know the plant. 



6. Cuscuta cephalanthi Engelm. Am. Journ. Sci. 43: 336. 1842. 

 Cuscuta tenuiflora Engelm.; A. Gray, Man. 350. 1848. 



Type locality: "Near St. Louis," Missouri. 



Range: Washington to Saskatchewan, southward to Arizona, Texas, and Pennsylvania. 

 Specimens examined: Ophir, Elmer; North Yakima, Piper 1796; Snohomish County, 

 Gardner 217 ; Waitsburg, Horner 569. 

 Zonal distribution: Transition. 



7. Cuscuta californica Choisy, Mem. Soc. Phys. Geneva 9: 279. 1841. 

 Type locality: "Hab. nov. California." Collected by Douglas. 

 Range: Washington to California. 



