252 
CONTRIBUTIONS TO BOTANY. 
fere sequalia vel breviora, erecta, apice ssepe inflexa ; antherce 
sub-2-lob8e, reuiformes, oscillatorise, transversim 2-valves, 
valva antica quam postica breviore, et rima bippocrepica late 
hiante. Discus imo tenuissimus aut fere evanidus, ibique ad 
fundum calycis adnatus, margine (in coarctationem tubi) 
libero latissimo et convolutim inflexo bine valde conspicuus, 
carnosus, et annularis. Ovarium superum, globosum, 3-sul- 
catum, 3-loculare; ovula in loculis solitaria, e basi erecta. 
Stylus filiformis, calyci sequilongus. Stigma parvum, obtuse 
3-lobum. Fructus siccus, subglobosus, 3-sulcatus, calycis 
cupula semi-immersus, subcapsularis, in coccos 3 solubilis, 
coccis crustaceis, rima ventrali elastice 2-valvatim debiscenti- 
bus, monospermis. Semen erectum, ovatum, vix compressum, 
ventre subangulatum ; tunica externa nitida, durissima, cornea, 
hilo basali pervio et transversali ; integumentum secundum 
membranaceum, et medio substantia laxe cellulosa subcoriacea 
opaca ad priorem agglutinatum, rapbigerum ; raphe filiformis, 
e basi lateraliter orta, bine cursu omnino peripberico apicem 
transiens, et tunc altero latere ad bilum iterum regrediens ; 
integumentum internum praecedenti laxatum, membranaceum, 
subopacum, a medio sensim ai'ctatum, et imo in cerviculam 
filiformem brevem terminatum, chalaza majuscula carnosa 
apicali munitum. Fmhryo intra albumen carnosum inclusus; 
radicula brevissima, infera, tereti, cotyledonibus carnosis folia- 
ceis, planis, cordato-ovatis. 
Suffrutices Americce Meridionalis, plerumque extratropicales, 
intricato-ramosi, subaphylli, ramis decussatim oppositis, diva- 
ricatis, ramulis spinescentibus, spinis subulatis scepe compressis, 
interdum latissime expansis et decurrentibus ; folia paucissima, 
minuta, scepe rudimentaria, opposita, Integra ; flores infra 
spinas orti, albidi vel albido-rosei, pedicellis \-jloris, nutan- 
fibus, 
1. Colletia spinosa, Lam. Illustr. ii. 90. tab. 129; Diet. Suppl. 
ii. 312 ; DC. Prodr. ii. 28. — C. borrida, Willd. i. 1113; Vent. 
Hort. Cels. 92. — C. polyacantba, Willd. in R. Sch. v. 113. — 
Rbamnus Yaquil, Domb. MSS. ; — spinosissima, ramulis spi- 
nisque compressis valde striatis, striis in ramulis spiraliter, in 
spinis recte parallelis, spinis validis, longiusculis, decussatis, 
subulatis, apice callo acutissimo rubro terminatis ; foliis parvis, 
oblongo-ovatis, glaberrimis, integris, aut summum versus den- 
ticulatis, caducissimis, breviter petiolatis, infra spinas insertis ; 
floribus solitariis, vel paucis fasciculatis e tuberculo sub 
spina ortis, pedunculis brevibus reflexis; calyce cylindrico, 
medio constricto, imo arapliore et subgloboso, limbi laciniis 5, 
reflexis, acutis, apice callo instructis, staminibus parvulis ore 
