18 ON SOUTH-AMERICAN APOCYNACEZ. 
plant being still extant in the herbarium of the British Museum. Itis curious that, in the 
interval of 110 years, this rare plant has not again been met with, although that neigh- 
bourhood has been since industriously searched by many scores of collectors. The genus 
is near Couma, differing in the singular form of its corolla (which suggested its generic 
name), in the shape of its stamens, the structure eR its disk, and other features, as the 
following diagnosis will show. 
Crratires, Soland.—Char. emend. : Sepala 5, acute oblonga, membranacea, subreflexa. Corolla tubulosa, 
flavide tomentosa, tubo cylindrico, calyce triplo longiore, supra medium constricto, et hinc intus 
infra piloso, limbi segmentis 5 obtuse lanceolatis, tubo «quilongis, subdextrorsum contortis, extus 
cum appendicibus subulatis sub apicem cornutis tomentosis, intus concavis et glabris. Stamina 5, 
inclusa, ad constrictionem tubi inserta: filamenta subbrevia, tenuia, extus pilosula; anthere libere, 
erectz, lineares, 2-lobze, sub medium divaricatim fissee, in sinu affixee, lobis utrinque obtusis, longi- 
tudinaliter dehiscentibus. Discus breviter tubulosus, liber, margine integro minute glanduloso. 
Ovaria 2, subglobosa, pilosa, disco :equilonga; stylus glaber, filiformis, stamina attingens, apice 
fusiformi-incrassatus ; stigmata 2, parva, acuta, pilosa, subdivaricata. Fructus ignotus. Frutex 
Brasiliana ; folia opposita, elliptica, petiolata ; panicul axillares folio dimidio breviores, bis trichotome, 
floribus circ. 9 in dichotomiis, fere sessilibus, dense tomentose. 
1. CERATITES AMENA, Soland. MS. in sched. 1083; in Prim. Fl. Bras. p. 68, tab. pict. 26: ramulis 
teretibus cinereo-opacis, axillis nodulosis : foliis oppositis, elliptico-oblongis, imo acutis, apice sensim 
subacutis calloso-mucronatis, chartaceis, marginibus integris subrevolutis, supra pallide et lete 
viridibus, subnitidis, nervis tenuissimis vix prominulis, subtus flavide opacis, brevissime puberulis, 
costa nervisque prominulis; petiolo tenui, semitereti, glabro, limbo 20plo breviore: paniculis 
axillaribus, flavide puberulis, circa 9-floris; peduneulo 3-ramoso, ramis dichotome divaricatis, cum 
flore fere sessili in dichotomiis; pedicellis brevissimis; sepalis lanceolatis, membranaceis, reflexis, 
puberulis; corolla flavide tomentosa; cet. ut in char. gener. In Brasilia: v. s. in hb. Mus. Brit. 
Rio de Janeiro (Solander, anno 1768). 
I have stated that this genus approaches Cowma in structure: the latter is described 
and figured by Müller, who alleges that it has no disk; but I have found in C. dulcis and 
C. oblongifolia a decided disk, concealing 2 pilose ovaries as in Ceratites. In the present 
species the branchlets are 1 line thick, the axils being 3-1 in. apart; the leaves are 
3133 in. long, 11-12 in. broad, on petioles 11-2 lines long; the peduncle is 6 lines long, 
the 3 branches 4 lines long, each dichotomously divided, with a flower in each dichotomy, 
on pedicels $ line long; sepals 1 line long; tube of corolla 4 lines long, segments 3 lines 
long, with cornute appendages 2 lines long, placed below the apex: stamens seated in — 
the contraction of the tube; filaments slender, 14 line long; anthers 1 line long: style — 
41 lines long. 3 
A figure of this species, with an analysis of its peculiar floral structure, is exhibited in 
Plate I. c. 
POMPHIDEA. 
This genus* is proposed for a Jamaica plant collected by Swartz, and hitherto un- 
described. Its floral structure, in many points, approaches that of Ambellania. It has 
* So named from roupos (cutis tumide vesicata) and idéa ( facies). 
