CACTACEZ OF THE IVES EXPLORATION. 991 
The specimens have 13 compressed, interrupted ribs. The floriferous is contiguous to the spiniferous [13] 
areola, not separated from it by the cylindric glands present in several allied species. After flowering, the 
floriferous areola forms a groove two thirds down the upper side of the tubercle (or prominent part of the rib), or 
even almost to its base. Number of radial spines 7 to 11. The description of the flower, wanting heretofore, may be 
given thus :— 
loribus versus apicem congestis virescenti-flavis pollicaribus; ovaris sepalis squamiformibus paucis (2-5) 
orbiculatis seu reniformibus munito; sepalis tubi 10-15’ inferioribus ovatis, superioribus oblongis obtusis; petalis 
sub-8 oblongis mucronatis; infimo tubi parte intus nudo; filamentis tenuissimis numerosis; stylo exerto sursum 
clavato apice infundibuliformi in stigmata 5 brevissima erecta seu conniventia divi 
e flowers are 1 inch long, greenish-xed; externally tinged with suas ee . shies green. The fruit remains 
unknown as yet. The large seed has been figured in the work mentioned. 
Ecurnocactus Leconte!, Engelm. in Mex. Bound. Rep., II. p. 23, tab. 27; and Pacif. Rail. Rep. 1. c., p. 28, 
tab. 2, fig. 3-5 ; Synops. Cact., p.18. In the Colorado valley. In flower in April. — Specimens of 3-5 inches diameter 
have below 8 and above 13 ribs; those of 9-12 inches show 19-21 ribs. The lowest bunches (those developed 
probably in the third or fourth year) have 8 radial and 1 central spines, all annulated ; the central one is curved, not 
hooked, 1 or even 3 of the lower radial ones are often hooked. The fully developed bunches consist of 4 central spines, 
the upper and lower one of which is quite flat ; 5 or 7 lower radial ones, never hooked ; 3 upper ones; and 6-12 slender, 
bristly radial spines. The ovary is covered with about 30 sepaloid scales, in the specimens examined, in 4 or 
arrangement. 
Ecurnocactus? Young specimens, 3-5 inches high, of another evidently large species, were collected, with 
13 ribs ; 4 central and 5 lower, stouter, and 3-6 upper slender radial spines, all annulated and curved.. The plants, 
showing no indication of floriferous areola, must be undeveloped; they may possibly be young ones of Z. polycephalus, 
or belong to species yet unknown to us. 
E. VIRIDESCENS, Nutt. in Torr. & Gray, Fl. I., p. 554; Engelm. in Mex. Bound. Rep. II., p. 24, tab. 29; 
Synops. Cact., p. 19. San Diego, California; with 25-30 scales on yellow fruit. Seed as described in Mex. Bound. 
Rep., but the pits are much closer together than in fig. 6, ¢.!| The hooked acute cotyledons are bent over a rather 
copious albumen, similar to those of EZ. Wislizeni, tab. 25, fig. 4, e. 
Cereus FenpDLertI, Engelm. in Plant. Fendl. in Mem. Amer, Acad. 1848, p. 51; Mex. Bound. Rep. II., p. 33, 
tab. 51-68; aie Cact., p. 25. Coveras, New Mexico, and from Laguna to Santa Fé. Flowers in April. 
C. pHaniceus, Engelm., Pacif. Rail. Rep. 1. c., p. 34, tab. 4, fig. 1; Synops. Cact., p. 28. Echinocereus 
coccineus, Engelm. in Wisliz. Re ep. N. Mex., note 9.— This is Mamillaria aggregata, Emory’s Report, 1848, and the 
a keoeregate | Cactus” of the explorers of the western parts of New Mexico and the Gila regions. It grows in large 
dense masses, often 100 or 200 heads from a single base, the whole often of the shape and size of a bushel basket, 
-sseyd on apparently naked rocks ; in the proper season densely covered with beautiful crimson flowers. It was 
und from Camp 64 to Camp 78 (Yampai Valley to Partridge Creek). In flower in April. The flowers collected are 
i than 2 inches long, much more densely covered with bristle-bearing sepals than the next species, and with only 
5 stigmata; the neal space in the base of the tube is nearly 4 lines long. The fruit and seed of this common 
plant, which has now been known to science for twelve years, still remains unknown, and living plants are as yet 
extremely scarce. 
C. conorpEvs, Engelm. & ap ehh Lc., p. 35, tab. 4, fig. 4-5: Synops. Cact., p. 28. Camp 96 
(Oryabe gardens, Moqui “country) owering in May.—So nearly allied to the last that we considered ita [14] 
form or subspecies of it. Dr. oa beeeh has now obtained the flowers. His specimen has fewer spines than 
Dr. Bigelow’s original ones, — 8 or 9 radial ones, about 1 inch long, and 1 or 2 central angulate ones, 13-2 inches long, 
all whitish and somewhat translucent. They resemble the spines of C. enneacanthus; but the flowers are vastly 
different, being open day and night, and not diurnal, as those of the species ae mentioned. 
Floribus magnis diametro transversali duplo longioribus coccineis; ovari 0 parvo squamis sepaloideis 8-12 trian- 
gulatis in axilla lanam albam et aculeolos 3-5 graciles gerentibus manite tubo sensim ampliato sepalis fere 20 lanceo- 
latis aculeigeris instructo ; —— supeioribus sub-8 oblongis obtusis ; petalis 10-13 spathulatis obtusis ; staminibus 
numerosissimis et stigmatibus & 9 vix exsertis petala subequantibus 
flowers are 33-4 sashes long a 1}-2 inches in diameter ; the slender spines in the axils of the upper sepals 
are 6-8 lines in length ; the stigmas, as in the whole subgenus Pidinccetes, velvety green. 
OPUNTIA BASILARIS, Engelm. & Bigelow, 1. c., p. 43, tab. 13, fig. 1-5, and tab. 23, fig. 14; Synops. Cact., p. 42. 
Abundant on the Colorado from Fort Yuma to the Great Cafion, and one of the most common species in the Colorado 
valley and desert. Dr. Newberry confirms the description before given of the peculiar growth of this species. A large 
number of joints of different shape — obovate, obcordate, emarginate, or elongate and almost oblanceolate — issue from 
