Jan., 1923] YUNCKER — SOUTH AMERICAN SPECIES OF CUSCUTA 
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26. Cuscuta pentagona Engelmann 
For the synonymy, description, and illustration of this species see 
Yuncker, Ill. Biol. Monogr. 6: 140. 1921. 
Key to the South American Varieties 
Styles slender, not becoming subulate in fruit. 
Calyx lobes overlapping, forming angles at the sinuses; flowers relatively small. 
typica. 
Calyx lobes not at all, or but slightly, overlapping and not forming angles at 
the sinuses; flowers usually larger. calycina . 
Styles becoming subulate in fruit, intrastylar opening large. subulata. 
Cuscuta pentagona typica 
Specimens examined: Argentina: Buenos Aires (Venturi 100). 
Uruguay: Montevideo (Fruchard in 1871, and in 1875; Courbon 146). 
Cuscuta pentagona calycina Engelmann 
Specimen examined : Brazil: Itajahy (Ule 487). 
Cuscuta pentagona subulata n. var. 
Styles becoming subulate, capsule and intrastylar aperture large, scales 
scarcely reaching, or reaching, the stamens. 
Type locality: Maraham, Brazil. Distribution: Brazil and Ecuador. 
Specimens examined: Brazil: (Glaziou 19677 in part); Maraham (Gardner 6068 in 
part, the type, a fragment in the Engelmann herbarium); Prov. Sao Paulo (St. Hilaire C 1 
1271 ); Prov. Santa Catharina (Pabst 565). 
Ecuador: Guayaquil (Jameson 542). 
27. Cuscuta gymnocarpa Engelmann 
(PI. IV, fig. 22, A-E) 
Cuscuta gymnocarpa Engelmann, Trans. Acad. Sci. St. Louis 1: 496. 1859. 
Stems slender to medium. Flowers about 2 mm. long, becoming 2.5-3 
mm. long in fruit with the enlarged capsule, on pedicels about as long as 
the flowers, in few-flowered, globose, umbellate clusters; calyx slightly 
shorter than the corolla tube, lobes ovate, obtuse or slightly acutish, not 
overlapping; corolla campanulate, thin, lobes triangular, acute, upright, 
with tips frequently indexed, shorter than the tube; scales reaching the 
stamens, ovate, fringed with moderate processes, bridged below the middle; 
stamens shorter than the lobes, anthers oval, about equal to the stout 
subulate filaments; styles about equal to, or shorter than, the globose 
ovary. Capsule globose or slightly depressed-globose, the withered corolla 
remaining at the base, not circumscissile. Seeds two to four in each capsule, 
about 1.5 mm. long, oval, hilum prominent, oblique or perpendicular. 
This species differs from C. pentagona in having shorter, upright corolla 
lobes, shorter filaments, and more globose capsules. It differs from C. acuta 
in having the corolla at the base of the protruding capsule, shorter corolla 
lobes and styles, and obtuse calyx lobes. 
