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 63 1 ^2) » 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 (Stearns 205). 



Cuscuta tine tori a Martius 



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. 



