30 ILLINOIS BIOLOGICAL MONOGRAPHS [120 



This is the only species seen possessing the combination of circum- 



scissile capsule and numerous subtending bracts. 



Type locality: Hillside near Guadalajara, Jalisco, Mexico. 



Specimens examined: Mexico: Jalisco; liillside near Guadalajara (Pringle 2472, the 

 type, in the U. S. Nat. Herb, as sheet 49,852), Vera Cruz; Zacuapan (?) (Purpus 8175). 



Subsection obtusilobae Engelmann 

 Cuscula Obtusilobae Engelmann, Trans. Acad. Sci. St. Louis, 1: 479, 1859. 



Flowers mostly relatively large; calyx rather deep; lobes obtuse, more 

 or less overlapping; styles slender. Typically of Mexico, the West Indies 

 and the southern United States. 



Key to the species 

 Flowers short, the corolla lobes about equalling the tube. 



Calyx lobes deltoid, slightly, if at all, overlapping C. applanala (p. 30). 



Calyx lobes orbicular or ovate, overlapping C. linctoria (p. 31). 



Flowers relatively long; corolla lobes shorter than the tube. 



Calyx deeply divided; lobes orbicular C. floribunda (p. 32). 



Calyx cup deep; lobes short, broadly ovate. 



Flowers about 3 mm. long; scales about reaching the filaments, bridged at the 



middle or above C. aniericana (p. 32). 



Flowers about 5-6 mm. long; scales shorter than the tube, bridged below the middle. 

 Corolla bulging outward between the furrowed stamen attachments; scales 



sparingly fringed; calyx lobes not greatly overlapping 



C. corymbosa grandiflora (p. 35). 



Corolla cylindrical, not particularly furrowed; calyx about reaching the middle 



of the corolla tube or shorter, lobes not greatly overlapping 



C. corymbosa stylosa (p. 35) 



Corolla cylindrical, not furrowed, scales prominent; calyx lobes broad, over- 

 lapping and somewhat angled at the sinuses; stigmas relatively large .... 

 , C. macrocephala (p. 36). 



Cuscuta applanata Engelmann 

 [Figures 30, 68 and 132] 



C. applanata Engelmann, Trans. Acad. Sci. St. Louis, 1 :479, 1859. 

 C. alata Brandegee, Univ. Calif. Publ. Bot., 3:338, 1909. 



Stems medium to coarse. Flowers glabrous, pentamerous, 2-3 mm. 

 long, somewhat fleshy or membranous, subsessile on pedicels shorter than 

 the flowers, in dense cymose panicles; calyx slightly shorter than or equal- 

 ling the corolla tube; lobes broad, triangular-ovate, obtuse, frequently 

 irregularly keeled in the median portion and below the sinuses down onto 

 the short pedicels; corolla campanulate, conforming in shape to the 

 maturing capsule; lobes ovate to oblong, obtuse to acutish, with slightly 

 uneven edges, spreading, nearly as long as or equalling the tube; scales 

 longer than the tube, spatulate, fringed towards the apex with medium 

 length processes, bridged at from one-quarter to one-third their height; 

 stamens shorter than the lobes; anthers ovate, slightly cordate, about 

 equal to the filaments; styles exserted, unequal, as long as or longer than 

 the globose ovary; stigmas capitate. Capsule depressed-globose, some- 



