38 ILLINOIS BIOLOGICAL MONOGRAPHS [128 



divergent; corolla tube cylindrical, lobes spreading to reflexed, ovate, 

 acutish, shorter than the tube, somewhat overlapping; scales nearly 

 reaching the filaments, spatulate, fringed, bridged at from a quarter to a 

 third of their height; anthers elliptical or oblong, sessile or subsessile; 

 styles longer than the globose ovary. Capsule probably circumscissile, 

 though not seen in fruit. 



Type locality: San Luis Potosi, Mexico. 



Specimens examined: Mexico: San Luis Potosi; (Purpus 4972, 5444, the type, in 

 the Univ. California Herb, as sheet 157,411). 



Cuscuta choisiana n. sp. 

 [Figures 14 and 80] 



Stems slender. Flowers 2.5-4 mm. long, waxy white and sometimes 

 covered with white or transparent pellucid glandular appearing cells, nearly 

 sessile, on pedicels as long as or mostly shorter than the flowers, clustered 

 in compact clusters, each usually subtended by an ovate lanceolate bract; 

 calyx lobes ovate-lanceolate, acute to acuminate, overlapping, about 

 equalling the corolla tube, spreading somewhat at the tips; corolla cylin- 

 drical-campanulate; lobes upright to spreading, lanceolate, acuminate, 

 about equalling the tube; scales reaching the filaments, fringed with 

 medium length processes, bridged at about their middle; stamens slightly 

 shorter than the lobes; anthers ovate, sagittate, versatile, some anthers 

 showing apiculate connective; ovary globose-ovoid, slightly conical because 

 of a thickening about the intrastylar aperture; styles slender, longer than 

 the ovary, exserted; stigmas capitate. Capsule globose, circumscissile: 

 seeds 2-4 in a capsule, ovate-globose, compressed, slightly oblique; hilum 

 short, elliptical, oblique. 



The name given this species is in honor of J. D. Choisy, the first botanist 

 to mongraph the dodders. 



Type locality: San Luis Potosi, Mexico. Range: Central Mexico. 



Specimens examined: Mexico: San Luis Potosi; San Luis Potosi (Purpus 4971, the 

 type, in the U. S. Nat. Herb, as sheet 842,189), Chapala (Purpus 5036). 



Cuscuta odontolepis Engelmann 

 C. odontolepis Engelmann, Trans. Acad. Sci. St. Louis, 1:486, 1859. 



Stems slender. Flowers white, 3-5 mm. long, pentamerous, on pedicels 

 shorter than the flowers in dense cymose paniculate clusters, usually with 

 a broadly ovate, acute bract subtending one or several flowers; calyx 

 shorter than or equalling the corolla tube, papillose- verrucose; lobes 

 broad, ovate, deltoid, acute, overlapping; corolla cylindrical or campanu- 

 late, lobes shorter than or about equalling the tube, ovate, acute, upright 

 to spreading or becoming reflexed, with or without a horn-like projection 

 on the dorsal surface near the tip; scales large, oblong or somewhat spatu- 

 late, dentate about the upper portion only or fringed, shorter than the tube 

 or reaching the filaments; stamens shorter than the lobes, anthers oblong 



