Rubiacea.] MEXICO. 295 



Ord. XLVI. RUBIACE^. Juss. 



LEPTOPETALUM. Nov. Gen. 



Calycis tubus quadridentatus. Corotfflfquadripartita, laciniis elongatis lineari-spathulatis angustissimis patulis 

 utrinque glabris. Stamina 4 ; filamentafiliformia corollam axmantia : antherce oblongje oscillatoris. Ovarium 

 biloeulare, multiovulatum. Stylus filiformis, apice crassior et subemarginatus. Capsula hemispluerica, coin- 

 pressiuscula dentibus calycinis coronata bilocularis, vertice loeulicida, rima dehiscens. Semina plurima in 

 quoque loculo, (immature) minuta angulata.—Frutex glaber. Rami angulati. Folia opposita, sessilia, 

 ovaiia, acutiuscula, basi subcordata. Stipulae late triangulares, breves acutm, interpatiolares ; Corymbi 

 terminales, trichotomi. 



1. Leptopetalum Mexicanum. (Tab. LXI.) 



Tab. LXI. Fig. 1. Flower ; Jig. 2. Corolla and stamens ; fig. 3. Pistil ; fig. 4. Fruit ; fig. 5. The same 

 cut through transversely : — magnified. 



1. Hamelia patens. Jacq. 



1. Chiococca racemosa. Jacq. 



1. Farameum? (Tetramerium) ; foliis breviter petiolatis oblongo-lanceolatis 



acutis stipulis caducis ramulorum lads brevibus exaristatis, cyma terminali trichotoma, 

 bacca globosa calycis dentibus brevibus coronata. 



Hab. Acapulco. Apparently near F. jasminoides or sessilifolia. Leaves two to four inches long. 



1. Cephalanthus occidentalis. Linn. 



1. Bigelovia distans — Borreria distans. Ch. 8f Schl. — Spermacoce distans. H. B. K. 



2. B ? 



Caules adscendentes pubescentes. Folia ovata acuminata basi in petiolum attenuata, utrinque pubescentia. 

 Stipularum setaB 2-3, tubo paullo longiores. Capitulum (in frustulo unico suppetente) solitarium terminale, 

 3-4 lineas in diametro, foliis quatuor parvulis bracteatum. Calyx pilis albis erectis vestitus : tubus obconicus : 

 limbi dentes 4, insequales, corolla infundibuliformis, tubo brevi tenui. 



We cannot refer this satisfactorily to any described species, although most probably it may be among those 

 enumerated by De Candolle ; it may be Borreria Bartlingiana, but approaches much also to B. Wydkriana. 



1. Spermacoce tenuior. Linn. — Hab. Tepic and Talisco. 



1. Diodia barbigera ; prostrata glabra, foliis oblongis acutis basi in petiolum attenu- 

 atis, stipularum setis 4-5 tubum basi barbatum aequantibus, floribus aggregatis verticilla- 

 tis, calycis dentibus 4 obtusis, corolla (minuta) ore albo-barbata. — Hab. Talisco. 



1. Mitracarpum Schizangium. De Cand. Prod. 4. p. 572. 



1. Galium Aparine. Linn. — G. Mexicanum. H. B. K. 



There are three other Rubiacem in this collection, but they are already noticed among those from Loo 

 Choo and Bonin, whence they were, in all probability, brought. 



