574 
AMERICAN JOURNAL OF BOTANY 
[Vol. 9, 
Flowers about 4 mm. long; calyx about reaching the middle of the 
corolla tube, ovate-cordate anthers about equal to the filaments; scales 
about reaching the middle of the tube, dentate or with a few scattered 
processes. 
This variety represents the typical variety for the species. Only one 
specimen has been seen of it, the specimen from which Ruiz and Pavon's 
description was probably taken. 
Type locality: Peru. Distribution: Known only from the type locality. 
Specimens examined: Peru: (Herb. Ruiz, taken to represent the type, a fragment in the 
Engelmann herbarium; herb. Pa von, apparently of the same collection as the foregoing. A 
specimen in the Boissier herbarium without indication of locality or collector is evidently 
the same). 
22. Cuscuta prismatica Pavon 
(PI. Ill, fig. 14, A-E) 
Cuscuta prismatica Pavon Mss. ex Choisy, Mem. Soc. Phys. Hist. Nat. Geneve 9: 182, 
PI. 3, fig. 2. 1841; and in De Candolle, Prodromus 9: 457. 1845. — Engelmann 
Trans. Acad. Sci. St. Louis i: 485. 1859. 
Flowers about 6 mm. long, subsessile, in dense clusters; calyx deep, 
reaching to the middle of the corolla tube, slightly angled, papillate, red, 
lobes unequal, much shorter than the calyx tube, ovate, acute, overlapping; 
corolla cylindrical, granulate, lobes about one fourth as long as the tube, 
upright to spreading, oblong, acutish and sometimes cuspidate; oval anthers 
sessile; scales short, not reaching to the middle of the tube, sparingly 
fringed toward the apex with few processes, bridged below the middle; 
styles slender, about twice as long as the globose ovary. Only a fragmentary 
capsule was seen, but that evidently circumscissile. No seeds were seen. 
Choisy pictures this species as without scales and Engelmann so de- 
scribes it, but in all of the flowers opened I never failed to find scales. 
Type locality: Guayaquil, Ecuador. Distribution: Known only from 
the vicinity of Guayaquil, Ecuador. 
Specimens examined: Ecuador: Guayaquil (Pavon, the type, a fragment in the 
Engelmann herbarium; Remy in 1856). 
Subsection Leptilobae Engelmann 
Key to the Species 
Corolla lobes shorter than the tube; flowers commonly reddish 23. C. partita. 
Corolla lobes ordinarily as long as, or exceeding, the length of the corolla 
tube 24. C. umhellata. 
23. Cuscuta partita Choisy 
Cuscuta partita Choisy, Mem. Soc. Phys. Hist. Nat. Geneve 9: 284, PI. 5, fig. 3. 1841; 
and in De Candolle, Prodromus 9: 460. 1845. — Engelmann, Trans. Acad. Sci. St. 
Louis i: 487. 1859. — Progel in Martins, Flora Brasiliensis 7: 386, PI. 128, fig. 6. 
1871. — Yuncker, 111. Biol. Monogr. 6: 130, figs. 12, 118, and 156. 1921. 
Stems medium. Flowers about 2 mm. long, on pedicels shorter than or 
exceeding the length of the flower, in loose, umbellate-racemose or more 
densely compact clusters, reddish, glandular; calyx shorter than or ex- 
ceeding the corolla tube; lobes ovate-lanceolate, acute to acuminate; corolla 
