27 
with bunches of, spines which, as in the last species, on the flower are 
indicated only by few and short bristles. Seed with tubercles conflu¬ 
ent, and leaving pits between them. Nearly allied to the two last, 
but sufficiently well distinguished by the characters given. 
15. C. Engelmanni, Parry in Srll. Journ. 1852: ovato-cylindricus, 
11-13 costatus ; aculeis radialibus Sub-13 albidis, superioribus ceeteris 
r multo brevioribus, centralibus 4 lorigioribusi angulatis rectis, 3 superi¬ 
oribus fulvis arrectis, inferiore longiore albido porrecto seu deflexo; 
. floribus lateralibus; seminibus tuberculato-scrobiculatis. • 
Var. /3. ghrysocentrus, E. & B. in Pi B. B.: aculeis radialibus 
12 - 14 albidis, centralibus 3 superioribus validis vitellinis erectis, infe¬ 
riore albo compresso deflexo. 
Var. y. variegattts, E. & B. 1. c.: .aculeis radialibus sub-13 albi¬ 
dis, centralibus 3 superioribus recurvatis divaricatis nigris corneo-vari- 
egatis, inferiore longiore albo decurvo. 
Lower Gila, Colorado, and westward to the California mountains: 
fl. June and July. Stems 5 — 10 inches high ; radial spines slender, 
3-6 lines, central ones 1-2 inches long. Fruit near the top of the 
plant. — Dr. Bigelow collected a little farther north, on Bill Williams’s 
Fork, the two forms which I have put under p. and y.; though they 
differ from the species by having the fruit lower down on the plant; 
the arrangement of the spines, however, is entirely identical. Yar. /3. 
has very stout central spines, 2-3 inches long, of a deep golden- 
' yellow color, and the lower one shorter. In var. y. the central spines 
are only 1 — 2 inches long, much curved, and the upper ones white 
and black mottled. 
* # Coccinei; floribus diu nociuque apertis. 
16. ? C. GONACANTHUS, E. & B. in P. B. B.: ovatus, subsimplex, 
7- costatus; areolis remotis; aculeis robustis angulatis ssBpe curvatis^ 
radialibus 8 flavidis ssepe basi obscuris, summo cseteris multo majore 
centralem multangulatum validum ssepe fiexuosum subsequante. 
Near Zuni, in Western New Mexico, under cedars* — Badial spines 
8- 15 lines long, upper one and central spine 1J-2J inches long, 
remarkably stout, angular and channelled. — I have not seen the 
flower of this plant, but place it frere from its resemblance to the next 
species; on the other hand, it seems to be allied to C. Mojavensis . 
17. C. triglochidiatus, E. in Wish Bep.: ovato-cylindricus, 6 - 7 
costatus, parce ramosus ; areolis remotis; aculeis 3- 6 robustis an- 
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