121] NORTH AMERICAN AND WEST INDIAN CUSCUTA—YUNCKER 31 



what four-sided about the developing seeds, circumscissile, leaving the 

 obcordate dissepiment in the calyx, surrounded by the withered corolla; 

 seeds brown, about 1.4 mm. long, oval, usually four in each capsule; 

 hilum short, oblong, transverse to oblique. 



This species somewhat resembles C. pentagona but is easily distin- 

 guished from it by the circumscission of its capsule. The type of Brande- 

 gee's C. alata is a small, strongly keeled form. Some of the smaller forms 

 of C. applanata approach the larger forms of C. potosina but are differen- 

 tiated from them by the possession of longer styles and more oblong, 

 obtuse corolla lobes. 



Type locality: ''In Arizona Territory south of the Gila River." 

 Range; Mexico, Texas, Arizona and New Mexico. 



Specimens examined: Mexico: San Luis Potosi (Palmer 6313^), San Luis Potosi to 

 San Antonio, Texas (Parry 500). Puebla; Puebla (Purpus 5730), Tehuacan (Rose & Rose 

 11413, Rose, Painter & Rose 9887, 9888, 10275, Rose & Hay 5866). Durango (Palmer 641), 

 Mapimi (Palmer 517). Chihuahua (Pringle 784, Palmer 142 and 227), Zacatecas; San Juan 

 Capistrano (Rose 2445). Sinaloa; Culiacan (Brandegee in 1904, the type of C. alata, in the 

 Univ. Calif. Herb.). 



United States: Arizona (Wright 1623— 541, Mexican Boundary Survey, taken as the 

 type, in the Engelmann Herb.), San Francisco Mts. Forest Reserve (Leiberg 5965). New 

 Mexico (Wright 1625), Rita de las Frijoles (Cockerell 20). Texas; Presidio (Trelease 342), 

 El Paso (Steams 205). 



Cuscuta tinctoria Martins 

 C. tinctoria Martius in Engelmann, Trans. Acad. Sci. St. Louis, 1:480, 1859. — Progel in 



Martius, Flora Brasiliensis, 7: 379, pi. 126, fig. 6, 1871. 



Stems medium to slender or in some specimens rather coarse. Flowers 

 glabrous, 4-5 mm. long, pentamerous, sessile or subsessile, sometimes 

 subtended by an ovate-orbicular, cupped bract, single or in dense glomerules 

 of many flowers; calyx lobes unequal, orbicular or ovate, obtuse, over- 

 lapping, about as long as the corolla, sometimes keeled; corolla campanu- 

 late, becoming urceolate in fruit, thinner towards the base; lobes ovate, 

 or somewhat oblong, obtuse, overlapping, upright or mostly spreading; 

 scales reaching the filaments, bridged at about the middle or below; stamens 

 shorter than the lobes; filaments about equal to the oval-oblong, somewhat 

 versatile anthers; styles shorter or longer than the globose ovary, becoming 

 exserted in fruit. Capsule depressed-globose or infrequently somewhat 

 ovate and slightly pointed, circumscissile; seeds about 1.5 mm. long, three 

 or four usually in each capsule, angled, olive brown; hilum oblong, linear, 

 transverse, areola dark colored. 



Cuscuta tinctoria typica 

 [Figures 16 a-e and 79] 



Scales abundantly fringed, bridged at about the middle; styles as long 

 as or usually exceeding the ovary and capsule. 



Type locality: Oaxaca, Mexico. Range: Throughout Mexico and 

 to Guatemala. 



