CONTRIBUTIONS TO BOTANY. 
291 
but the differences here are yet more strongly marked : the latter 
has not only a distinct form of calyx, but it is quite dissimilar in 
the structure of its fruit, which is enclosed in the entire un- 
changed persistent calyx, and which consists of an evalvate in- 
dehiscent membranaceous pericarp that bursts by laceration, 
only to allow of the escape of the seeds. The name of the genus 
was derived from the vernacular appellation of the typical species, 
Trevo or Trebu. Its character is thus defined : — 
Trkvoa, nob. — Calyx petaloideus, tubulosus, tubo imo inflato, 
medio ssepe constricto, fauce paulo ampliore, intus praesertim 
versus basin villosissimo, pilis albidis retrorsis, limbi laciniis 
4 vel 5, triangularibus, erectiusculis, intus carina calloque 
notatis, marcescens et persistens. Petala 4-5, rotundata, cu- 
cullata, unguiculata, laciniis calycinis breviora, erecta. Stamina 
4-5, petalis inclusa, et cum eorum unguibus inter lacinias in- 
serta; filamenta brevia, pilosa, imo complanata, subulata, 
apicerepenteinflexa; antherce roi\mA.sXiR, Retamilia similes. 
Discus parvus, caruosus, ovai-io 3-plo latior, subconcavus, ad- 
natus. Ovarium e medio disci superum, conico-oblongum, 
2- 3-sulcatum, hirsutissimum, 2-3-Ioculare. Stylus erectus, 
3- 4-gonus, angulis ciliatis, imo validiusculus et hirsutissimus. 
Stigma 2-3-lobum, lobis obtusis arete adpressis, albidum. 
Fructus drupaceus, ovatus, subcompressus, calyce marcido imo 
suffultus, endocarpio indehiscente nucamentaceo, 2-3-loculare, 
vel abortu uniloculare. Semen in quoque loculo solitarium, 
erectum, compresso-ovatum, nitidissimum, structura omnino 
Colletice. 
Arbusculse Chilenses frondosce, ramosissima, spinosce, trunci ligno 
duro, ramis oppositis, ramulis m/?’a spinas foliiferis et floriferis, 
spinis oppositis ; folia opposita, ovata, serrulata, S-nervia, fere 
glabra ; fiores e ramulis junioribus enati, in axillis oppositis 
solitarii, vel 2-3, fasciculati, hinc foliis carentibus sape race- 
mosi, aut axillis approximatis quasi spicati. 
1 . Trevoa trinervis, nob. Trav. ii. 529 ; — T. trinervia. Hook. Bot. 
Misc. i. 159 ; — Retanilla trinervia. Hook, in parte, ibid. iii. 
174 ; — Colletia Trebu, Bert. ; Colla, Mem. Torin. 37. p. 53 ; — 
arbuscula sesquiorgyalis, ligno duro rubente, ramosa, ramulis 
compressis, foliosis, spinosis, junioribus inermibus foliiferis et 
floriferis sub spinis enatis ; spinis viridibus, decussatim oppo- 
sitis, compresso-subulatis, calloso-pungentibus, patentissimis ; 
foliis oppositis, ovalibus, mucronulatis, imo in petiolum cunea- 
tis, crenulato-dentatis, 3-nervibus, nervis pellucidis subparal- 
lelis, lateralibus versus marginem ramosis, et hinc in glandulas 
marginales excurrentibus, reticulato - venosis, glabriusculis, 
petiolo brevi, canaliculate, singulis e stipula fusca bifida ortis 
2 p 2 
