OF THE GENUS CUSCUTA. 
87 
more slender, calyx narrower than in any other form, and more distinctly 5-angled (angles corresponding to the 
commissures) ; scales and styles as in the other. G. leiolepis, Miquel! Linnsea, XVIII. 247* is the same tiling 
from the orange hedges in Surinam, but with shorter styles than any other form of this species examined by 
me. C. Snrinamensis, Schilling, de Lepra, pp. 60 and 200, t. 2, also seems to belong here. C. campanulata, Nuttall! 
mss. in Hb. Ac. Phil, from the West Indies, has the scales of this, but otherwise is identical with the ordinary 
form. 
Another form has a thicker, more coriaceous calyx, usually larger flowers (1£-2J lines long), larger [483 (33)] 
more deeply fimbriate scales, often exsert styles, and sometimes 2-seeded capsules. This is C. spectabilis, 
Clioisy! Cusc. 187, t. 5, f. 1; DC. Prod. IX. 459, from Bahia, Salzmann! 351; Blanchet! 85, and C. globulosa, 
Bentham! Bot. Sulph. 138, from Acapulco. The specimens from Surinam, Hostmann! 464, one of Poiteau’s! from 
Havti, and especially Linden! 1994, from Cuba, the largest of all, may be referred here. 
G. Americana, L., and of most authors on the Flora of North America, comprises, besides this, several North 
American species, especially <7, Gronovii, G. arvensis , and C. compacta. G. Americana, Thunb. is G. Africana. 
^ 30. C. corymbosa, Ruiz & Pa von, as intended by the authors, is a rare form of a species which, under different 
names, is common throughout northern, Soujh America and Mexico. The species, as here proposed, is distinguished 
by the copulate membranaceous calyx, with short and broad very obtuse lobes, loosely enclosing the lower part of the 
long cylindric tube of the corolla; lacinise short, mostly very obtuse, erect vor rarely spreading; anthers oval or 
orbicular-oval, sessile or on very short filaments ; scales mostly long and narrow, attached for the greater part of their 
length, more or less fringed at the sides and apex, always considerably shorter than the tube, rarely quite small and 
indistinct ; ovary small, globular or conic, with very long styles, which generally reach as high as the anthers, and 
often become exsert as the fruit ripens; capsule very small, often 1-seeded, always opening in its largest diameter^ 
surrounded and covered by the base of the shrivelled corolla; stylar portion of dissepiment reaching nearly to the 
bottom of the capsule; hilum reduced to a point. Very closely allied to the last species, but readily distinguished by 
the larger flowers and the larger elongated and exsert corolla. 
Var. a. grandiflora : flowers large, 3-4 lines long ; anthers on very short filaments or sessile; scales long and 
narrow, almost entirely adnate, rarely bifid; styles reaching the anthers or shorter; ovary and capsule globose or 
rarely somewhat conic. C. Popayanensis, HBK.! N. Gen. Sp. III. 123 ; DC. Prod. IX. 460, of which Kunth already 
mentions the capsule as circumscissile, and speaks of the close alliance to G. corymbosa. G. cymosa, Willd.! rel. 
R. & Sch. VI. 205, founded on the same specimen.—New Granada, Humboldt! Columbia, Hartweg! 1237 ; Moritz! 
489; Comitan, Mexico, Linden! 291; Caracas, Birchel! Gollmer! Venezuela, Fendler! 946; Peru, Dombey! in 
Hb. Mus. Paris, under the name of C. corymbosa. 
The following forms do not seem sufficiently distinct from this : G. patens, Benth.! Bot. Sulph. 35, [484 (34)] 
from the Magdalen Bay, Lower California, has rather wider and a little shorter flowers and shorter styles, 
which reach only as high as the linear scales. 
G. inclusa, Choisy! Cusc. 179, t. 2, f. 2; DC. Prod. IX. 455, from Mexico, Berlandier! 1103. — Similar to the 
last; styles even longer, but scarcely reaching the throat; anthers sessile. Choisy’s figure shows long filaments, and 
his description speaks of “ stamina basi corolloe affixa,” etc., which is perfectly unintelligible. Choisy’s figures are 
by no means reliable in the details; as is evident in examining, for example, the scales in his figures of G. Ardbica , 
Chinensis, and others, the ovary of G. Gvorwvii , Americana, etc. This is one of the few Guscutce known to me where 
there is in the flower in full bloom a slight approach to the ventricose shape. 
G. laxiflora, Benth.! Bot. Sulph. 138, from Acapulco, is the same plant, with a somewhat conic ovary and 
capsule, uniting this with the next form; flowers about 3 lines long, styles not exsert. 
C. Popayanensis, Pceppig! Hb. is a variety of C. micrantha. 
Var. j8. stylosa. G. stylosa , Choisy! Cusc. 187, t. 5, f. 2 ; DC. Prod. IX. 459. — Flowers rarely more than 
2 lines long, slender, with very short calyx; narrow cylindric corolla; short, narrow scales; filaments as long or 
shorter than anthers ; styles reaching to the throat of the . corolla or above it, often long exsert at maturity of fruit or 
before ; ovary and capsule conic, or rather inversely pear-shaped. The length of the styles is variable, even in the 
original specimens quoted by Choisy; the shape of the capsule would be characteristic enough, if intermediate forms 
did not indicate a transition to var. grandiflora .—Found thus far only in Mexico: Andrieux! 73 and 214; Berlandier! 
822; Hb. Jacquin! under the name of G. Americana; Ghiesbrecht! 186; Toluca, Karwinski! Zimapan, Galeottil 
1412; Jalapa, Linden! 308 in part. 
In the Kew Herbarium I find a specimen sent by Botteri from the Orizaba, Mexico (nro. 949), which is this form 
with scarcely exsert styles, larger flowers (3 lines long), and acutish crenulate laciniae. 
Var. y. microlepis. G % corymbosa, Ruiz & Pavon! FI. Peruv. I. 69, t. 105, b., not Choisy Cusc. nor DC. 
Prod. — Flowers lf-2 lines long, as often 5- as 4-parted in the original specimens in Hb. Ruiz and in Hb. Pavon, both 
of which seem to be parts of one and the same specimen; calyx cupulate, with short obtuse lobes half as long as the 
corolla; lacinise ovate, obtuse, nearly one third the length of the tube, erect or patulous; filaments as long as the 
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