DR. GRISEBACH ON COUTOUBEA VOLUBILIS. 145 
collected by Mr. Wendland in Central America, the rosy-violet 
flowers of which are four or five inches long. The structure of 
its ovary is the same as in Lisianthus (ovarium biloculare, placenta 
laminata utrinque duplici); but the plant is anomalous in the 
genus by having the large hypogynous ring of Tachia. Except in 
the larger size of flowers (but not so much as, from a misprint in 
its description, it would appear), this shrub agrees sufficiently with 
the figure of L. catygonus, R. P., or is at least nearly allied to this 
and to L. daturoides. 
Petasostylis is an artificial genus, chiefly distinguished from 
Leianthus by a two-celled capsule. Both species, collected again 
by Mr. Wendland (P. saponarioides in Costa Rica, P. nigrescens in 
Guatemala), are variable in the size of the flowers: the corolla of 
both is often two inches long, and the lobes (much too long in the 
figure of Bot. Mag. t. 4043) only 3-4!", as described by Schlech- 
tendal. 
In Eastern Cuba a remarkable new Lisianthea was discovered 
by Mr. Wright (no. 1346), which, though my materials do not 
allow the dissection of more than two flowers and a single fruit, may 
be regarded as a link between Lisianthus, of which it has the an- 
thers, and Leianthus umbellatus, which it approaches by its axillary 
peduncles and prominulous leaf-sheaths. 
ZONANTHUS, nov. gen. 
Involucrum calycem cingens, foliolis geminis rotundatis in tubum 
breviorem connatis, tubo cupuliformi apice intus in marginem 
annularem integrum productis. Calyx campanulatus, ecarina- 
tus, demum fissilis, 5-lobus, lobis quadrato-subrotundis planis im- 
bricatis margine membranaceis. Corolla hypocraterimorpha, dex- 
trorsum contorta, ad medium fere 5-loba, tubo campanulato, 
lobis oblongis obtusis. Stamina medio corolle tubo inserta, 
filamentis exsertis, antheris incumbenti-recurvis, loculis con- 
nectivo dilatato adnatis. Ovarium placentis suturalibus divisis 
semi-4-loeulare, stylo elongato, stigmate 2-lamellato. Capsula 
septicida, bivalvis, carpidiis 2 introflexis semi-4-locularis, pla- 
centis polyspermis marginalibus, testa reticulata. Frutex, foliis 
spathulato-oblongis petiolatis, petiolis in vaginam annularem 
connexis; pedunculi axillares, solitarii, folia subequantes, uni- 
flori; corolla virens. 
Z.cuBENsis, Gr. Rami teretiusculi, internodiis brevibus; folia 3-4" 
longa, obtusiuscula, arcunervia, in petiola 6-10'” longa attenuata ; 
pedunculi 3", calyx 8", involueri tubus ei appressus 3-4" longus, 
LINN. PROC.—BOTANY, VOL. VI. L 
