WESTERN TROPICAL AMERICA, 133 
CONVOLVULACER. 
The plants of this order appear to be very numerous in tropical America, but 
owing to the early period of the day at which their flowers close, and the difficulty 
of drying them well, the comparatively few specimens brought home by collectors 
are usually very unsatisfactory. The leaves, moreover, vary much in form in 
different parts of the same plant, and the genera into which the known species 
are distributed are for the most part established upon purely technical characters, 
having often little or no relation to the habit of the plants. I have therefore re- 
frained from describing several species of which the specimens are not very satis- 
factory, although I have been unable to refer them to any of those contained in 
De Candolle’s Prodromus, and have only established as new those of which the 
collection contains good specimens affording decided characters by which they 
differ from all others with which I am acquainted, as well as from the specific 
characters given by Choisy. 
548. Areyreta? oblonga, sp. n., volubilis, ramis lignosis, novellis angulatis tomentosis, foliis 
elliptico-oblongis vel rarius ovatis basi obtusis supra pilosulis subtus nervosis ad venas tomentosis, 
pedunculis brevibus, corymbis confertis tomentosis, sepalis coriaceis ovatis obtusis tomentosis, corolla 
infundibuliformi-tubulosa glabra vel apice tomentella,—Tepic. 
Frutex alte scandens? Folia 2-4 poll. longa, 1-13 poll. lata, acuminata vel obtusa, basi nee cordata nec 
_ angustata, omnia que vidi integra, supra pilis minutis conspersa, subtus prominente penninervia et teatervestion 
venulosa ; petiolo tenui 6-10 lin. longo. Pedunculi crassi, uti pedicelli et ealyces tomento denso albido-flavic- 
ante obtecti. Inflorescentia bipollicaris, corymboso-multiflora. Bracteze parve, lineares. Sepala “aiid 
pollicaria, inter se subeequalia, intus glabra seepe rubescentia. Corolla sesquipollicaris vel paullo pain, best 
contracta, superne in faucem elongatam ampliata, limbo (patente?) 5-angulato. Alabastram apice leviter 
tomentosum. Anthere: 4 lin. longe. Ovarium carnosum, biloculare, 4-ovulatum. 
Although I have not seen the fruit of this plant, the ovary is So thick and 
fleshy as to leave little doubt of its belonging to the tribe of the Argyreie, and the 
ovary is certainly bilocular ; I have therefore ventured to place it in Argyreia, 
although Choisy has no American species of that genus. The habit is that of 
some of the Asiatic species, and Choisy himself suspects that one or two of the 
American plants placed by him doubtfully in Rivea may prove to belong rather 
to Argyreia. 3 
549. Quamoc.tr coccinea, Chois. in DC. Prod. v. 9. p. 335.—Tiger Island, Gulf of Fonseca, 
Guayaquil. 
550. Quamoctit hederefolia, Chois. 1. ¢. p. 336.—Columbia. 
551. Quamocut vulgaris, Chois. 1. c.—Mexico to Guayaquil, 
MM 
