Dec, 1922] YUNCKER SOUTH AMERICAN SPECIES OF CUSCUTA 
573 
Specimens examined: Brazil: Goyaz (Glaziou 2i8og, the type, in the Royal Botanic 
Gardens, Kew, a fragment in the author's herbarium) ; Island of Fernando de Noronha 
(Moseley in 1873). 
20. Cuscuta americana Linnaeus 
For the description and synonymy of this species see Yuncker, 111. Biol. 
Monogr. 6: 122, figs. 22, 109, and 138. 1921. 
Progel in Martins, Flora Brasiliensis 7: 376. 1871, apparently con- 
sidered this species as being made up of three varieties. I do not believe, 
however, that three varieties can be maintained, and, even with the two 
that are segregated, it is sometimes difficult to keep them distinct. The 
variety congesta as here considered includes both the typical variety and 
the variety congesta as proposed by Progel. 
Cuscuta americana congesta Progel 
Specimens examined: Brazil: (Gardner 1775); Bahia (Salzman in 1845; Blanchet 
736); Goyaz, Buixas (Weddell 2208); Minas Geraes (Claussen jod) ; Rives de I'Araguay 
(Weddell 22q8); Matto Grosso, Cuyaba (Malme i8q8); Fernando de Noronha, Portuguese 
Bay (Ridley, Lea, and Ramage 73); Rat Island (Moseley in 1873). 
Colombia: Santa Marta (Smith 1590, 2549); Barranquilla, Medellin, and Antioquia 
(Mayor Giradot (Rusby and Pennell 93). 
Ecuador: Bodegas (Sodiro 113 1 9). 
Venezuela: (Karsten); Near Colonian Tovar (Fendler 20(5p). 
Cuscuta americana spectahilis Progel 
Specimen examined: Argentina: Prov. Jujuy (Fries 229), 
21. Cuscuta corymbosa Ruiz & Pa von 
For the description and synonymy of this species see Yuncker, 111. Biol. 
Monogr. 6: 124, figs. 24, 104, and no. 1921. 
Key to the Varieties 
Flowers 4-8 mm. long, scales definite 
Flowers 6-8 mm. long, anthers subsessile, calyx usually exceeding the middle 
of the corolla tube grandiflora. 
Flowers 4-5 mm. long, filaments longer, calyx short, not reaching the middle 
of the corolla tube (no specimens of this variety have been seen from 
South America) stylosa. 
Flowers about 4 mm. long, scales indefinite and thin microlepis. 
Cuscuta corymbosa grandiflora Engelmann 
Specimens examined: Colombia: (Humboldt, taken to represent the type of this 
variety, a fragment in the Engelmann herbarium; Hartweg 1237). 
Ecuador: Between Guaranda and Bodegas (Remy); Cotacachi (Holmgren 924). 
Venezuela: Caracas (Birschel, Gollmer); "prope coloniam Tovar" (Fendler 9^(5). 
Cuscuta corymbosa microlepis Engelmann 
(PI. IV, fig. 20, A-E) 
Cuscuta corymbosa microlepis Engelmann, Trans, Acad. Sci. St. Louis i: 484. 1859. — 
Progel in Martins, Flora Brasiliensis 7: 378. 1871. 
Cuscuta corymbosa Ruiz & Pavon, Fl. Peruv. i: 69, PI. 105, fig. b. 1798. 
Not Choisy nor Jussieu. 
