CACTACEH OF THE BOUNDARY. 195 
covered by the innumerable poe tice or reddish spines. Lower — oe somewhat bulbous and compressed at 
base, 6-7 lines ois Sasa 3-4 lines, and lower ones about 5 line upper central spines shorter than the 
lower ones, — these are the neni and ae about the length of the ane er et spines, or a little longer. Flowers 
large and numerous aps the upper axille of the past year’s growth, before the growth of the same spring is much 
advanced, so that they appear terminal or central at first glance, as they cover the top of the plant. This is the case 
with many spring-flowering Echinocerei ; others (e. g. the last- aka species) produce their flowers lower down on 
the plant from older axille. ower 3 inches or more in length, and of the same diameter, very showy, externally 
greenish-yellow, with the centre of sepals red ; petals bright-yellow ; stamens, counted by Mr. Wright, over 1,700, 
with yellowish-green filaments; pistil stout ; stigmata thick, erect. Flower (like those of most Echinoceret) open in 
bright sunshine only about the middle of the day, closing in the afternoon, sal reopening the next or even the 
third day, unless the weather be very hot, when all the fanetions of the arin are performed in one day. Fruit [31] 
subglobose, “as inch in diameter, green or greenish-purple; when fully ripe, “delicious to pod — ike 
a gooseberry.” Seeds 0.6 line long, subglobose, very little oblique, with an oblong basilar hil ngly and 
distinctly tuberculated, like those of C. cespitosus; embryo almost straight, or rather the shines aay bent 
forward. 
4. C. CTENOIDES, sp. nov. : subsimplex, ovatus ; costis 15-16 obliquis subinterruptis ; areolis lanceolatis con- 
fertis ; aculeis rigidis albidis denis cinereis intertextis, radialibus 14-22 pectinatis basi bulbosa — compressis 
arcte adpressis sepe subrecurvis, lateralibus longioribus, summis brevissimis, centralibus 2-3 raro 4 uniseriatis 
abbreviatis robustis basi bulbosis ; floribus versus apicem lateralibus campanulatis flavis ; ae gow pulvillis 
ee: ' : : . coriBs 
oO seu 
30 squamiformibus ad axillas setis 3-10 munitis, sepalis interioribus 5 lanceolatis acutis, intimis obtusis, omnibus 
mucronatis ; petalis 25-30 se obtusis retusis vel obcordatis cnumanat flavis basi angustata virescentibus ; 
filamentis numerosissimis virescentibus brevibus; stylo albido ; stigmatibus 10-12 obtusis erecto-patulis viridibus. 
(Tab. XLIT.) 
m Eagle Pass to Santa Rosa (Bigelow) ; on the Pecos (Wright). Flowers June and July (in St. Louis). — 
Stems sd jon high, 13-2} 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 1 line long, also about 1 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 pai 
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 }-1 line, lower one 1-2 lines, and the others 3-4 lines long; central aaiead in a single 
saagerren series one above the other, 1-3 lines long. Flower bright yellow, with a light-green ce and dark- 
stigmata, open from eight or nine till one o’clock, 23-3} inches long, 24-34 inches in diameter, pe broad and 
aaa petals forming an even uninterrupted margin all around; ovary with 38-44 pulvilli, scales obsolete, woo 
ry w ool 
short, bristles about 15 in each bunch, 2-3 lines long; pulvilli of tabe 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 14-1} inch long, 3 inch wide, 
lower part of the tube narrow, and for about 14 line, naked inside ; filaments very numerous and very slender; anthers 
small, pale-yellow ; stigmata rather slender, 3 lines long 
ur plant looks distinct enough from C. dasyacanthus, which is taller, has a larger number of ribs, rounder and 
shorter areolz, 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, a8 as Echinocactus intertextus 
and FE. dasyacanthus belong together, and as C. viridiflorus and C. chloranthus may be joined: intermediate forms, 
seer. have not yet been observed. It has already been stated that the flowerless pea so closely resembles 
= pectinatus that it can hardly be distinguished from it except by the fewer ribs. The color of the flowers, to be sure, 
very different ; but though no instance is yet known among Cerei where yellow and _— flowers are found in the 
same species, this may not be impossible, and we may possibly have to unite all these form: 
C. pectinatus, E., var.? RIGIDISSIMUS: ovato-cylindricus; costis 20-22 interruptis; areolis lineari- ean 
confertineinie, junioribus parce lanosis; aculeis omnibus radiantibus arcte adpressis subrecurvis e basi bulbosa subu- 
latis acutissimis rigidissimis albidis flavidis tubellisve ed meer lateralibus 12-16 longioribus robustioribus, 
infimo singulo vix breviore, superioribus setaceis brevibus fasciculatis; floribus sub vertice lateralibus; [32] 
ovarii pulvillis 50-60 aculeolos 8-12 rigidos sicotthae: sepalis tubi 40 inferi joribus subulatis ad axillam aculei- 
feris, superioribus 20 lanceolatis acuminatis; petalis sub-20 eros acutiusculis inciso-dentatis purpureis ; stigmati- 
bus sub-12; bacca ovato-globosa aculeolata; seminibus tuberculat 
n the Sierras of Pimeria Alta in Sonora, and farther wie (A. Schott). Flowers June and July. — Stems 
4-8 ‘dics high, 2 inches in diameter. Areole 2-25 lines long in the larger full-grown specimens, 3 or 4 within 
1 inch of the rib; in a small specimen, with only 15 ribs, smaller areole, and smaller and more numerous spines 
(30-35, only 1-14 line long), 12 or more bunches of spines are crowded within the same space. Spines all radiating and 
