129] NORTH AMERICAN AND WEST INDIAN CUSCUTA—YUNCKER 39 



or oval, about equal to the filaments; styles slender, much longer than the 

 globose ovary, becoming exserted in fruit; stigmas capitate. Capsule 

 globose, thickened at the apex, readily circumscissile; seeds about 1.2 mm. 

 long, light brown, generally four in each capsule, angled; hilum linear, 

 oblique. 



Cuscuta odontohpis typica 

 [Figures 7 a-d, 116 and 153] 



Scales oblong, bridged at about a quarter of their height, shorter than 

 the tube, denticulate at the truncated apex only, corolla cylindrical, lobes 

 acute. 



Type locality: Arizona. Range: Northern and central Mexico and 

 Arizona. 



Specimens examined: United States: Arizona; (Wright 1624-529, the type, in the 

 Engelmann Herb.), Santa Rita Forest Reserve (Griffiths & Thomber 21), Santa Rita Mts. 

 south of Tucson (Engelmann in 1880). 



Mexico: Sonora; Fronteras (Hartman 52). 



Cuscuta odontolepis fimbriate n. var. 

 [Figure 7 e] 



Flowers shorter and campanulate; corolla lobes more obtuse, sometimes 

 mucronate or with a dorsal projection; scales somewhat spatulate, bridged 

 at about the middle, fringed with medium length processes. 



Type locality: Papasquiaro, Durango, Mexico. Range: Central 

 Mexico to Costa Rica. 



Specimens examined: Mexico: Durango; Papasquiaro (Palmer 412, the type, in the 

 U. S. Nat. Herb, as sheet 304,596). Guanajuato; Guanajuato (Duges in 188Q). 



Costa Rica: (Warscewicz in 1848). 



Cuscuta potosina Schaffner 



C. potosina Schaffner in Watson, Proc. Amer. Acad. Arts & Sci., 18:124, 1883. 



Stems slender. Flowers glabrous, about 2 mm. long, subsessile on 

 pedicels shorter than the flowers in cymose panicles, commonly tetramerous 

 or pentamerous, infrequently trimerous; calyx equal to or shorter than 

 the corolla tube; lobes triangular acute; corolla campanulate or short 

 cylindrical; lobes triangular acute, upright to slightly spreading, shorter 

 than the tube; scales narrow, oblong, denticulate or fringed about the apex, 

 shorter than the tube or reaching the filaments, bridged at about one- 

 third their height; stamens shorter than the lobes, filaments slightly longer 

 or shorter than the oval to roundish anthers; styles filiform, as long as or 

 shorter than the globose somewhat ovate or depressed ovary; stigmas 

 small, capitate. Capsule circumscissile with a small irregular opening, 

 depressed-globose or ovoid, with the withered corolla at the apex or 

 about it; seeds about 1mm. long, one to four in a capsule, but commonly 

 only one, globose, flattened on one side, rounded on the other, finely 

 punctated; hilum linear, oblique in a definite umbilical area of slightly 

 darker color. 



