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, 2-2^' 

 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 |-1' 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, (4-6' 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, ^-IJ' long, the 

 upper longest; the central 4, stouter, recurved, IJ' long; flowers large, 

 2-2^''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. Greorge 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. 



Cekeus^ Engelmanni, Parry. Heads several, 4-12' high, cylindric or 

 ovate, with 11-13 ribs, bearing bunches of about 13 pale acicular radiating 



1 CEEEUS, 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 § Echinocereus, Eng. : — Heads comm.only 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. 



