CATALOGUE. 
117 
13-17 interrupted ri])s ; 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 ; ers yellow, large, 2-2 J' 
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' high, with longer spines, (the 
longest 3-5' ;) the northern but 3-4' high, with spines rarely more than 
2', the radial ones but J-1' long. 
EcnmocACTUS 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, (4-6' high,) oval, 
with 17-21 low rounded interrupted close-set often obhque ribs, densely cov- 
ered with stoutish reddish-gray spines; the outer 10-14, J-IJ' long, the 
upper longest; the central 4, stouter, recurved, IJ' long; flowers large, 
2-2 4' 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' high, cylindric or 
ovate, with 11-13 ribs, bearing bunches of about in pa](> acicular radiating 
1 CEREUS, Haw. Sepals ami petals united above the se]ial-l)e;n i ii- n . aiy into a short or usually 
long tube. Berry juicy, globose or oval, beset with scales (sonH'tiinrs rafl.cr ii,.listiiH:i ) ..r spinr^. S.-.ds 
brown or black fembryo straight or usujilly curved, without albuMicn ; cotyledons short or l..li:ur„..,s 
commonly contrary to the sides of the s<.od.-( il..bosc <.r oval, or mostly . yln.dr.c or chunnan U■^y- or 
many-ribbed, usually l^ranched, bearing bunches of spines on the ribs; ilowrs L.ten.l, just nbov.- an.l 
close to the spines of previous seasons, usually large, folly open in sunlight or at n.ght or, ran ly, p. r- 
manently. , , , i- 
Tlie above species belong to ^ Eci.iNn. KnKrs, Eng. :-ireads conunonly n.Muy, h.Nv, oval or cylin- 
dric ; flowers short, mostly as wide .as long ; ovary covered with bnnchcs of spmes ; sfgnms grec : ..N 
small, tuberculated ; cotyledons short, straight. 
