18 SOUTH AMERICAN BOTANY. 
tubular corolla is, in like manner, ventricose on one side, with a 
somewhat five-lobed, companulate and slightly bilabiate border, 
and it offers quite the induplicato-valvate æstivation of the Nola- 
naceæ and Solanaceae. The calyx has a very short, fleshy tube 
with five unequal, erect segments, two of them being reduced to 
the size of small teeth, while the other three are more or less half 
the length of the corolla; in two species these are foliaceous and 
singularly veined, in the other they are subulate and fleshy; the 
tube of the calyx enlarges and becomes intumescent and bony, as 
the fruit advances to maturity; and in the last mentioned instance 
the calycine lobes in like manner are at length converted into 
spines. The structure of the seed, however, is quite at variance 
with that of the Nolanacee, approaching nearer that of the Myo- 
poraceæ or Ehreliacee, for the drupaceous calyx encloses an in- 
dehiscent, 2-celled carcerule, with a single seed suspended from 
the summit of each cell, the almost straight and inverted embryo 
being nearly the length of its fleshy albumen, and having a small 
superior radicle with two oblong, compressed cotyledons. I have 
called the genus SCLEROPHYLAX, from expos, durus and $vXa£, car- 
cer, because of the manner in which the seed-vessel becomes incar- 
cerated by the singular enlargement and bony intumescence of the 
calyx. The following generic character will explain its structure. 
SCLEROPHYLAX. (gen. nov.)—Ca/yz 5-partitus, tubo 5-gono 
brevissimo, laciniis 2 vel 3, elongatis, triquetris, subulatis, aut 
interdum expansis, foliaceis, subcarnosis, alteris brevibus, fructifer 
auctus. Corolla hypogyna, gamopetala, tubo infundibuliformi, 
sub faucem contractam superne ventricoso, limbo brevi, 5-plicato, 
subcampanulato, sub-bilabiato, labio superiore 3-lobato, inferiore 
2-lobato, lobis omnibus æqualibus, brevibus, obtusis, æstivatione 
induplicato-valvatis. Stamina 5, tubo corollæ inserta, inclusa: 
filamenta imæqualia, gracilia, paulo dilatata, uno breviore, alteris 
subæqualibus, apice incurvato-declinatis : anthere 2-loculares, 
ovate, basi cordate, in sinu affixæ, connectivo nullo, rima longi- 
tudinali extus dehiscentes. Pollen ovatum, longitudinaliter 
 9.suleatum. Ovarium superum ovatum, conicum, 2-loculare: 
ovula in loculis solitaria, apici appensa, anatropa. Stylus fili- 
