Dec, 1922] YUNCKER — SOUTH AMERICAN SPECIES OF CUSCUTA 
559 
Key to the Subgenera 
Stvles more or less united (no species belonging in this subgenus were found 
from South America) MoNOGYNA. 
Styles distinct 
Stigmas linear-elongated Succuta. 
Stigmas capitate Grammica. 
Subgenus Succuta (Des Moulins) Yuncker 
I. Cuscuta epithymum Murray 
For the description and synonomy of this species see Yuncker, 111. Biol. 
Monogr. 6: 112, figs. 2, 86, and 145. 1921. 
Specimen examined: Argentina: Prov. Buenos Ayres, on Medicago sativa (Ostenjj). 
Subgenus Grammica (Loureiro) Engelmann 
Key to the Sections 
Capsule circumscissile Eugrammica. 
Capsule remaining closed Clistogrammica. 
Section Eugrammica Engelmann 
Key to the Subsections 
Styles more or less subulate, at least in fruit Subulatae, 
Styles of about the same thickness throughout 
Flowers subtended by bracts Lepidanchopsis. 
Flowers not subtended by bracts 
Divisions of the perianth mostly obtuse Obtusilobae. 
Divisions of the perianth mostly acute or acuminate Leptilobae. 
Subsection Subulatae Engelmann 
Key to the Species 
Calyx lobes broad, obtuse 
Flowers without infrastamineal scales 2. C. grandiflora. 
Flowers with definite infrastamineal scales 
Scales very short, not reaching to the middle of the tube. . . 3. C brevisquamata. 
Scales reaching to the middle of the tube or mostly longer 
Styles none, or extremely short 
Capsule papillate, styles very short but evident 4. C argentinana. 
Capsule smooth, styles apparently none 5. C. microstyla. 
Styles nearly as long as the ovary, or mostly longer 
Anthers sessile, scales not reaching to the stamens. . . 6. C. chilensis. 
Anthers not sessile, scales mostly reaching the stamens 
Flowers commonly 4-6 mm, long, styles mostly 
longer than the ovary 
Corolla lobes ovate, mostly as long as the corol- 
la tube, becoming spreading or reflexed 7. C. odorata. 
Corolla lobes orbicular, much shorter than the 
corolla tube, upright, becoming connivent in 
fruit 8. C. glohiflora. 
Flowers 2,5-3 mm, long, styles shorter than the 
ovary 9, C. boliviana. 
