Rhamnece.} MEXICO. 283 



ovalibus rotundatis integerrimis, pedunculis axillaribus petiolo dimid-o brevioribus, 

 carpellis 4 in fructum 4-locularem 4-lobatum loculicido-dehiscentem coalitis obtusis. 



The internal structure of the carpels is not very dissimilar to that observed in Brunellia and Zanthoxylon. 

 The fruit is dotted with reddish glands ; the seed has a black shining testa. The leaves are so very obscurely 

 dotted as almost to be impunctate : they are about 2£ to 3 inches long, and from 2 to 2J broad. In some 

 respects it approaches Zanthoxylon Aublet.ia, De Cand., judging by De Candolle's short description ; but 

 that has the carpels quite distinct, according to M. Adrien de Jussieu. 



Ord. XXIV. CONNARACE,E. Br. 



1. Rourea glabra. H. B. K. ? — Hab. Acapulco. 



2. R. ? oblongifolia ; foliolis 3-5 sub-alternis coriaceis oblongo-lanceolatis acumi- 

 natis glabris basi obtusis vel acutiusculis, floribus axillaribus paniculatis, carpellis sub- 

 cylindricis. 



The carpels are like those of R. santaloides, W. and A. The leaflets resemble in shape those of Omphalo- 

 bium Lamberti, De Cand., but are smaller, and the carpels of that species are almost obovate. We have 

 neither seen perfect flowers nor fruit. 



Ord. XXV. CELASTRINE.E. 



1. Mygindus Scoparia ; ramis virgatis elongatis quadrangulatis, foliis oppositis (parvis) 

 remotis lanceolatis acuminatis glabris petiolatis argute serratis, pedunculis dichotomis 

 cymoso-umbellatis paucifloris filiformibus folio l|-4-plo longioribus.— Myginda Urao-oo-a, 

 var. foliis angustioribus. Schlecht. in Linn. 5. p. 603. — Hab. Acapulco. 



This appears to be only suffruticose ; but is evidently allied to M. Rhacoma, Sw. ; it differs from M. Uragoga, 

 by the glabrous leaves, besides other characters. The calyx is 4-lobed. Petals 4, with a broad base. 

 Stamens 4, almost as in Euonymus. Style I . 



In the Mexican collection are specimens, probably misplaced, of what we have already described and 

 figured as Euonymus Japonicus. 



Ord. XXVI. RHAMNECE. 



1. Rhamnus ( Antirhamnus) biniftorus; Mac. et Less, in De Cand. Prod. 2. p. 26.— var. ? 

 pedunculis trifloris, foliis oblongis ovatis vel ovalibus acutis vel obtusis cum mucrone basi 

 acutiusculis. — Hab. Talisco. 



De Candolle compares his plant with R. umbellatus, Cav. Ic. 6. t. 504, but that species has the leaves 

 almost sessile, while in our plant they are on rather long petioles. The segments of the calyx persist even 

 while the fruit is ripe, as in R. umbellatus, and are not deciduous, as in R. terniflorus, De Cand., or Colu- 

 brina triflora, Brongn. We have not seen the petals, but Cavanilles represents them cucullate in the ana- 

 logous R. umbellatus. The fruit is drupaceous : the nut is scarcely separable into nucules, but contains four 

 cells, of which two appear always to be abortive, as well as sometimes one of the remaining two : the embryo 

 is flat, as in the section Frangula of Brongniart. R. Humboldtiana is said to have the cells 2-seedel ; but 

 we are inclined to suppose that the dissepiment dividing the two seeds had been overlooked, and that it forms 

 part of the group Antirhamnus. 



