CACTACE. - 31 
flower are performed in one day. Fruit subglobose, 1-14 inch in diameter, green or 
greenish purple, when fully ripe “delicious to eat, much like a gooseberry.’’ Seeds 0.6 line 
long, subglobose, very little oblique, with an oblong basilar hilum, strongly and distinetly 
tuberculated, like those of C. cespitosus; embryo almost straight, or rather the cotyledons 
slightly bent forward, 
4, C. CTENOIDES (sp. nov. ): subsimplex, ovatus; costis 15-16 obliquis subinterruptis; areolis 
lanceolatis confertis ; aculeis rigidis albidis demum cinereis intertextis, radialibus 14-22 pecti- 
natis basi bulbosa lateraliter compressis arcte adpressis sepe subrecurvis, lateralibus longiori- 
bus, summis brevissimis, centralibus 2-3 raro 4 unisériatis abbreviatis robustis basi bulbosis ; 
floribus versus apicem lateralibus campanulatis flavis ; ovarii ovati pulvillis sub-40 aculeolos 
12-16 breves setaceos albidos seu apice fuscatos gerentibus ; tubi campanulati sepalis inferiori- 
bus 30 squamiformibus ad axillas setis 3-10 munitis, sepalis interioribus 12-15 lanceolatis 
acutis intimis obtusis, omnibus mucronatis; petalis 25-30 spathulatis obtusis retusis vel obcor- 
datis denticulatis flavis basi angustata virescentibus ; filamentis numerosissimis virescentibus 
brevibus ; stylo albido ; stigmatibus 10-12 obtusis erecto-patulis viridibus. (Tab, XLII.) 
From Eagle Pass to Santa Rosa, Bigelow ; on the Pecos, Wright; fl. June and July (in St. 
Louis).—Stems 2-4 inches high, 14-2 inches in diameter ; aspect of plant very similar to C. 
pectinatus, to which I allude by the Greek name, of the same meaning. Areole about one line 
Jong, also about one line apart ; spines whitish or ashy, and in some specimens with light brown 
tips ; sometimes I find only 14-16 radial spines, (1 upper, 1 lower, and 6-7 pairs of lateral 
ones) ; the older and larger ones have 7-9 pairs of lateral spines, 1 lower one, and often 3-5 
small bristly upper spines, Upper spines 3-1 line, lower one 1—2 lines, and the others 3—4 
lines long. Central spines in a single longitudinal series one above the other, 1-3 lines long. 
Flower bright yellow, with a light green centre and dark green stigmata, open from 8 or 9 till 
one o'clock, 24-3} inches long, 25-34 inches in diameter, the broad and obtuse petals forming 
an even uninterrupted margin all around. Ovary with 38-44 pulvilli, scales obsolete, wool 
short, bristles about 15 in each bunch, 2-3 lines long. Pulvilli of tube 25-35, with green 
fleshy sepals, the lower ones with 8-10 short, and the upper ones with 3-4 longer (5-6 lines 
long) bristles; petals 1}-1} inch long, 4 inch wide, lower part of the tube narrow, and for 
about 14 line naked inside ; filaments very numerous and very slender ; anthers small pale yel- 
low ; stigmata rather slender, 3 lines long. Our plant looks distinct enough from C. dasyacan- 
thus, which is taller, has a larger number of ribs, rounder and shorter areole, patulous and 
usually more numerous spines, and more and longer central ones, also flowers almost vertical, 
with stouter spines on their tube ; but it may, after all, be only a form of it, just as Lchinocactus 
interteztus and HL. dasyacanthus belong together, and as C. viridiflorus and C. chloranthus may 
be joined ; intermediate forms, however, have not yet been observed. It has already been stated 
that the flowerless plant so closely resembles C. pectinatus that it can hardly be distinguished 
from it except by the fewer ribs; the color of the flowers, to be sure, is very different, but, 
though no instance is yet known amongWerei where yellow and purple flowers are found in 
the same species, this may not be impossible, and we may possibly have to unite all these forms. 
5. C. pgotinatus, E., var.? RiGIDIssimus: ovato-cylindricus; costis 20-22 interruptis; are- 
olis lineari-lanceolatis confertissimis, junioribus parce lanosis; aculeis omnibus radiantibus 
arcte adpressis subrecurvis e basi bulbosa subulatis acutissimis rigidissimis albidis flavidis rubel- 
lisve subpellucidis, lateralibus 12-16 longioribus robustioribus, infimo singulo vix breviore, 
