RubiacecB.'] 
MEXICO.— SUPPLEMENT. 
429 
carpels, shown at figs. 3 and 4, and then the dissepiment is clearly seen to be double (fig. 7.) and of quite a 
distinct substance (not herbaceous, but between membranous and coriaceous) from the valve : and these, singly 
or two together, may often be seen among the clusters of fruit, resembling white, oval chaffy scales. In 
other words, the dissepiments sometimes fall away with the respective cells or carpels and sometimes remain 
attached to the receptacle after these latter have separated. This receptacle is a small spongy conical body 
(fig. 4.) whose apex reaches to the point of attachment of the seed. The valves are almost hemispherical; 
one frequently bears three teeth of the calyx, and the other two. The cavity is entirely filled by the seed, 
which is nearly hemispherical, transversely wrinkled, anteriorly marked with a deep longitudinal furrow, and, 
near the base of that furrow, with a scar where the seed was attached to the dissepiment. Among the cap- 
sules are numerous setae. 
The habit of Bigelovia, it must be confessed, is completely that of Spermacoce, as is that of Diodia like- 
wise ; and we cannot but agree with Achille Richard in his observations on the Genus Spermacoce, Mem. sur 
la Famille des Rubiacees, p. 150. “ Un examen attentif d’un tres grand nombre d’ especes nous a convaincu 
de la nec'.ssite de reunir en un seul les trois genres, Spermacoce, Diodia et Borreria {Bigelovia) ; c’est 
toujours un raeme type d’ organisation, non seulement dans toutes les parties de la fleur, mais encore pour le 
fruit d’apres lequel on a fonde la distinction de ces trois genres. En effet que les deux coques restent par- 
faitement closes comme dans les Diodia, ou bien qu’elle^ offrent une fente longitudinale comme dans les 
Borreria, ou enfin que la cloison reste completernent adherente a Tune des coques, tandis qu’elle manque 
dans I’autre'coque comme dans les veritables especes de Spermacoce; nous ne voyous la, nous le repetons, 
qu’un meme type d’organisation, d’autant plus que tres-souvent ces caracteres ne sent pas si nettement dessines 
qu’il soit facile de rappOrter une espece a telle ou telle de ces trois modifications. Nous pensons done qu’au 
lieu d’en former des types de genres, dies peuvent simplement etre employees pour etablir des subdivisions ou 
sections dans le genre Spermacoce, qui est fort nombreux en especes.” 
Tab. XCIX. B. — Fig. 1, 2. Capsules ; fig. 3, 3. Valves or carpels separated from the receptacle {fig. 4.) ; 
fig. 5, 5. Valves separated from the dissepiments, which latter remain attached to the receptacle {fig. 6.) ; 
fig. 7. Back view of a seed ; (at fig. 5. The inner face of the seed is seen) : — magnified. 
1. Mitvacax'^nm Schizangium ; diffusum suffruticosum, ramis subtetragonis pubescentt- 
bus, foliis oblongo-lanceolatis acuminatis utrinque et margine scabris, stipulis pubescenti- 
bus membranaceis setis rigidis, floribus axillaribus verticillatis et terminalibus capitatis 4- 
pbyllis, filamentis inclusis, seminibus cruciatim 4-lobis, lobis emarginatis. (Tab. XCIX. 
Ac) De Cand. Prodr. 4. 572. Hook, et Arn. supra, p. 295. — Schizangium durum. Bartl. 
in Herb. Hcenhe. [DC.) 
Hab. San Bias to Tepic. 
Caulis pedalis ad sesquidepalem, tereti-obscure tetragonus, glaber vel subpuberulus, basi suffruticosus, dif- 
fusus, ramosus, ramis brevibus. Folia opposita, (internodiis elongatis, praesertim in caule ubi 4-6 uncias longis) 
lanceolata, rigidiuscula, 2-3 uncias longa, 3-4.1ineaslata, utrinque acuminata, vix petiolata,subtrinervia, vel potius 
nervis paucis costa parallelis scabriuscula, ad marginem et ad nervos subtus scabra, pagina inferiore subpubes- 
centia. Stipules latse, membranacese, pubescentes, margine denticulatae et spinulis vel setis rigidis tribus 
appressis ferentes ; seta intermedia longiore validiore. Flores parvi numerosi, glomerato-verticillati, in axillis 
et in stipulis foliorum supremorum siti, vel terminales capitati, capitulo subtetrapbyllo, inter flores setoso ; 
setae numerosae. Flores brevissime pedicellati. Calycis tubus globosus, subdidymus, obscure costatus glaber, 
superne setoso-scaber, limbus 4-dentatus, dentibus subulatis, quorum duabus oppositis duplo longioribus latiori- 
busque, tubum4-plo superantibus, minoribus albidis, omnibus rigidis erectis,marginibus setoso-scabris,diaphanis. 
Corolla infundibuliformis, dentibus calycinis longior, extus pubescens, tubo gracili, limbo 4-lobo, lobis ovatis 
