CATALOGUE. 
117 
13-17 interrupted ribs; outer spines 20 or more, white, the uppermost 
broader and longer; central spines 5-10, upper one broadest, longest, white, 
curved, the others brown, terete, mostly hooked ; flowers yellow, large, 2-2J' 
long and wide, with about 8 fringed sepals on the ovary; seeds as in the 
last.—Head-waters of the Mohave (Bigelow) to the sage-plains of Western 
Nevada, (Gabb;) the southern form 4-10 1 * * * * * 7 high, with longer spines, (th'e 
longest 3-5';) the northern but 3-4' high, with spines rarely more than 
2', the radial ones but \-l' long. 
Echinocactus pubispinus, Eng. Small, (only 2' high,) oval, with 13 
compressed sinuate ribs; outer spines 6-10, bristle-like, 1-4" long, the upper¬ 
most longest, often curved or hooked, with or without a stouter hooked cen¬ 
tral one, all usually densely pubescent,—Flower and fruit unknown. Found 
by H. Engelmann in Pleasant Valley near Salt Lake Desert. 
Echinocactus Johnsoni, Parry MSS. Medium-sized, (4-(> high,) oval, 
with 17-21 low rounded interrupted close-set often oblique ribs, densely cov¬ 
ered with stoutish reddish-gray spines; the outer 10-14, long, the 
upper longest; the central 4, stouter, recurved, 1J' long; flowers large, 
2-2 J' long and wide, purple or pink, with numerous reniform sepals on the 
ovary and tube, and ovate obtuse petals; seeds reticulate-pitted.—Discovered 
about St. George in Southern Utah by J. E. Johnson, whose zeal for the de¬ 
velopment of the natural history and resources of his region is commemorated 
in the name of the species. 
.Echinocactus polycephalus, Eng. and Big. Usually with several 
heads, often over a foot high, with few very stout annulated curved spines 
and very early flowers, the base of which, as well as the fruit, is enveloped in 
dense cotton.—From the Mohave region, and may be looked for in Southern 
Nevada, 
Cereus^Engelmanni, Parry. Heads several, 4-12 7 high, cylindric or 
ovate, with 11-13 ribs, bearing bunches of about 13 pale acicular radiating 
1 CEREUS, Haw. Sepals and petals united above the sepal-bearing ovary into a short or usually 
long tube. Berry juicy, globose or oval, beset with scales (sometimes rather indistinct) or spines. Seeds 
brown or black; embryo straight or usually curved, without albumen; cotyledons short or foliaceous, 
commonly contrary to the sides of the seed.—Globose or oval, or mostly cylindric or columnar, few- or 
many-ribbed, usually branched, bearing bunches of spines on the ribs; flowers lateral, just above and 
close to the spines of previous seasons, usually large, fully open in sunlight or at night or, rarely, per¬ 
manently. • 
The above species belong to $ Eghinocereus, Eng.:—Heads commonly many, low, oval or cylin¬ 
dric ; flowers short, mostly as wide as long; ovary covered with bunches of spines; stigmas green; seeds 
small, tuberculated; cotyledons short, straight* 
