1 1 1] NORTH AMERICAN AND WEST INDIAN CUSCUTA—YUNCKER 21 



Cuscuta exaltata Engelmann 

 [Figures 6, 62 and 63] 

 C. exaltata Engelmann, Trans. Acad. Sci. St. Louis, 1:513, 1859. 

 C. gamostyla Engelmann, Trans. Acad. Sci. St. Louis, 1:513, 1859; in synon. 



Stems thick and stout (1-2 mm.). Flowers glabrous, 4-5 mm. long, 

 pentamerous, sessile or subsessile in spicate panicles; calyx lobes fleshy, 

 thick, concave, ovate-orbicular, obtuse, overlapping, nearly or quite as 

 long as the corolla tube, subtended by one or two smaller concave bracts; 

 corolla tube cylindrical with only the lobes exserted; lobes ovate-orbicular, 

 obtuse, overlapping; stamens included, sessile; anthers ovate; scales 

 composed of two wings, one on either side of the filament attachment, 

 bridged at about the middle, toothed along the upper portion, or in some 

 specimens the two wings united and free forming the ordinary type of 

 scale; ovary globose; styles equal, partially or completely united but 

 separating easily when pulled; stigmas flattened. Capsule ovate-globose, 

 circumscissile, 5-7 mm. long, carrying the withered corolla at the apex; 

 seeds about 3-3.5 mm. long, somewhat rostrate and triangular; hilum 

 oblong, oblique to transverse. 



This species is the only one found so far in North America possessing 

 united styles. It is commonly parasitic on trees, frequently on Quercus. 



Type location: In Western Texas. Range: Texas and Florida. 



Specimens examined: United States: Texas; New Braunfels (Lindheimer 472, 

 taken as type, in the Engelmann Herb.), on the Cibolo near San Antonio (Lindheimer in 1846), 

 at the mouth of Pecos (Bigelow in 1851), Dallas Co. (Reverchon 663, 2552, in 1875 and in 

 1880), on the Blanco (Wright in 1847), Western Texas (Nealley 260), Bexar Co. (Jenny in 

 1904). Florida; Volusia Co. (Baker in 1918). This specimen, in the Gray Herbarium, so 

 far as can be determined is identical with those collected in Texas. 



Sub-genus succuta (Des Moulins) n. comb. 



Succuta Des Moulins, fitudes org. cusc, p. 74, 1853, amplified. 



Schrebera Linnaeus, Sp. PI. (2 ed.), p. 1662, 1763. 



Cassytha (Gesner. ex) S. F. Gray, Nat. Arr. Brit. PL, 2:345, 1821. 



Lepimes Rafinesque, Fl. Tellur., 4:91, 1836. 



Cuscuta Pfeiffer, Bot. Ztg., 3:673, 1845. 



Epilinella Pfeiffer, Bot. Ztg., 3:673, 1845. 



Epithymum Opiz, Seznam, p. 40, 1852. 



Cuscuta group Cuscuta Engelmann, Trans. Acad. Sci. St. Louis, 1 :459, 1859. 



Flowers sessile or pedicellate; styles equal, distinct; stigmas linear- 

 elongated; capsule circumscissile or remaining closed. Natives of the 

 Old World. Four species have been introduced into North America as 

 parasites of cultivated crops. 



Section eucuscuta Engelmann 

 Cuscuta section Eucuscuta Engelmann, Trans. Acad. Sci. St. Louis, 1 :460, 1859. 



Styles as thick as or thicker than and slightly shorter than or exceeding 

 the length of the elongated stigmas. Capsule circumscissile. 



