CACTACEZ OF THE BOUNDARY. 183 
as many as 20, according to Mr. Schott’s notes 12-14: one spine is distinctly superior and one inferior ; the others 
are closely arranged along both sides of the areola, 4-9 lines long, upper ones often a little longer than the lower ones. 
Central spine 6-10 lines long, dark, mostly strongly recurved, adpressed, so that the plant can easily be handled with- 
out hurting; much like J. compacta from the mountains west of Chihuahua, to which it bears a strong resemblance. 
It seems to be fully rs however, by the arrangement of the flowers, which in ours originate from the base 
of full-grown tubercles, and are scattered over the top of the plant, being pushed out by younger tubercles bearing new 
buds ; aE in the Silaiibes species they come from the axils of young, just growing tubercles, and are crow ded on 
the densely woolly top. Flowers about 14 inch long and of the same width ; petals lemon-yellow, darker, and with a 
brownish tinge outside along the midrib. 
15. M. PECTINATA, sp. nov.: simplex, a tuberculis e basi quadrangulata conicis, inferioribus abbreviatis, 
summis floriferis teretibus tasters sulcatis ; areolis orbiculato-oblongis ; aculeis 16-24 omnibus radiantibus 
rumque subzqualibus seu suntinis fasciculatis kon us, e basi bulbosa lateraliter compressa subrecurvis, pecti- 
wei luteo-albidis demum cinereis apice spe sphacelatis intertextis ; floribus e vertice tomentosissimo centralibus 
flavis ; ovario globoso ; tubo brevi amplo; sepalis sub-30 acutis aristatis, ee lanceolatis:apice recurvis, 
interioribus oblanceolatis adpressis ; petalis sub-30 pluriserialibus oblanceolatis seu intimis obtusis retusisve, omni- 
bus herbaceo-aristatis ; stigmatibus 9-10 linearibus luteo-albis stamina longe superantibus ; bacca ovata viridi 
floris rudimentis coronata ; seminibus elongato-obovatis compressis levibus lucidis fuscis, hilo parvo ventrali. 
XI. 
(Tab 
n gentle slopes of the Iimestone hills on the Pecos, and at Leon Spring; abundant at the latter place : [13] 
Charles ‘Wrisht. Flowers in June and July. — The globose heads are 13-23 inches in diameter. Tubercles in 
13 spiral rows ; lower ones 2-3 lines long, and somewhat broader at base, not grooved, or with a very short groove near 
the spines ; upper tubercles 5-6 lines long, and grooved all the way down. Spines on lower part of plant nearly equal 
in length on each tubercle, 3-4} lines long, as stiff and pointed and almost as closely and regularly set as in Cereus pec- 
tinatus, whence the specific name. On the flower-bearing tubercles a upper spines are elongated, mixed with a few 
paid ones, and fasciculated ; lower ones 5-6 lines long, and u ones, forming a tuft about the apex of the stem, 
9 lines long.. Flower over 2 inches long, and 2? inches in Sissies when fully open, between 11 and 12 o’clock, 
abe sate about 1 o’clock though exposed to the full glare of the sun; ovary 3-4 lines long; exterior sepals 
reddish-green, interior ones yellow, with a darker midrib ; petals of a beantifal Se aces broadest in the upper 
third and obtusish ; filaments ae short, covering the whole base of the tube, leaving no naked space. Fruit 
about half an inch long, ripening on the vertex, and not pushed aside by succeeding young Siticecte, as it seems that 
no new ones are developed till the fruit is fully ripe, or probably till the succeeding spring. This is the case with 
several allied yellow-flowering species, but not with other red-flowering ones, hereafter to be described : in these, 
though the flower (or at least the flower-bud) be vertical, the succeeding rapid growth pushes them aside; and still 
more the berries, which finally appear quite lateral. Seed 0.9 line long, elongated, compressed, rounded at the back, 
quite sharp at the anterior or ventral edge, on the lower part of whieh: in a slight curvature, the small and narrow 
um is situated. 
16. M. Ecurnvs, sp. nov.: simplex, globosa seu subconica ; vertice dense tomentoso ; tuberculis in planta 
adulta teretibus apice conicis supra sulcatis ; areolis orbiculatis ; aculeis rectis seu paullo vucvatio cinereo-albidis apice 
seepe obscurioribus, radialibus 16-30 pectinatis, superioribus longioribus fasciculatis, centralibus 3-4 validioribus e basi 
bulbosa subulatis, superioribus 2-3 sursum versis cum radialibus superioribus implicatis, inferiore validissimo 
subulato recto (seu rarissime paullo reeurvo) porrecto ; floribus verticalibus flavis ; sepalis 20 lineari-lanceolatis 
mucronatis integris, petalis 20-30 angustis ; sf sub-12 stamina longe superantibus ; bacca centrali oblonga 
viridi floris rudimentis coronata ; seminibus ut in precedente. (Tab. X.) 
On ~ hills in the region of the Pecos, Wright ; and from Presidio del Norte to Santa Rosa, Bigelow. 
Flowers in June. — A very striking plant, characterized by the unusually stout and subulate lower central spine, 
which, together ith the globular shape, gives it the appearance of some Echinite, — whence the name. Specimens 
before me 14-2 inches in diameter ; tubercles 5-6 lines long, in 13 spiral rows. The numerous slender but very stiff 
whitish radial spines, laterally compressed at the thickened base, are densely interwoven and closely adpressed ; lower 
ones about 5 lines long, lateral ones somewhat shorter, upper ones 6-8 lines long ; upper interior spines stouter and 
rather longer than the upper radial ones, but otherwise hardly distinguishable from them ; the lower central spine is 
also about 6 or 8 lines long, very regularly subulate from a thick base. Flowers between 1 and 2 inches long ; to 
judge from the shrivelled specimens seen, yellow. Fruit over half an inch in length. Seeds about 0.9 line long, 
entirely similar to those of the last species, to which this, ipsa too closely approaches. All the specimens 
from the Pecos have very straight central spines ; but some from Presidio del Norte, not otherwise different, [14] 
have somewhat recurved and darker horn-colored central scien: 
17. M. sconymores, Scheidw. A small slender-spined form was collected by Mr. Wright on the Pecos, and 
