246 CACTACE^. Echinocactus. 



Arizona and Sonora to the Mohave region {Emory, Bicjdow, Schott), and into Lower California 

 Gabb. Plants 1 or 2 and even 3 feet high, 1 or 2 feet thick; all the spines very stout and 

 sti-ongly cross ril.Led, U to 3 inches long ; flowers 3 inches long, purplish Lrown outside • iietals 

 red, with yellow margin ; seeds much like those of the next species. 



6. E. Wislizeni, Engelm. Very large, oval, at last cylindrical or often club- 

 shaped, with 21 to 30 compressed crenate ribs: oblong areohe bearing various 

 spines ; in the centre 4 stout cross-ribbed ones, the lower one flattened and curved 

 or hooked; above and below 6 to 10 slightly ribbed, and laterally 10 to 20 

 long slender often flexuous ones : flowers greenish yellow, 2 to 21 inches Ion" • 

 ovary and fruit imbricately covered with 30 or 40 to GO or 100 roundish cordate 

 sepals ; inner sepals spatulate, 20 to 30 : petals as many, lanceolate, crenulate • style 

 divided to the middle into 12 to 20 stigmas : yellowish berry at last hard and dry • 

 seeds over a line long, reticulated. — Wislizenus liep. 1848, note 14- Cact Me\ 

 Bound. 23, t. 25, 26. i > , ^u luex. 



_ From the Pdo Grande to the Colorado, northward into Utah and west into California • flower- 

 ing througliout the summer and autumn. Often 3 and even 4 feet high and 1 or '> in diameter 

 with a woolly spineless top ; spines U to 2^ indies long, gi-ayish red, the thinner ones whitish 

 ^a n' 4' ^*^' "•' ^^^'^"^^ ^ ^^''^® ^^^" founded on weaker plants of this, with the seeds of perl 



* * Scales of the ovary subulate, often spinescent, copiously woolly in their axils ; fruit 

 envelojjed in ivool. — Eriocarpi. 



7. E. polycephalus, Engelm. & Big. Middle-sized or large, globose, at last 

 cylmdric, sprouting frum the base; ribs 13 to 21, acute : circular areola? bearing 8 to 

 12 stout compressed annulated curved reddish gray spines: flowers enveloped in a 

 mass of dense white wool : petals about 30, lance-linear, yellow : stigmas 8 to 1 1 

 linear: dry berry full of large angular seeds. — Cact. of Pacif E. Rep iv 31 t s' 

 fig. 4 - G. I J > 



Gravelly or stony soil on the Colorado and Mohave rivers, and in the Californian desert (Binc- 

 Imv) ■ flowering in February, fruiting in March. Heads sometimes 20 or 30 from a sin-le base 

 5 to U leet high, the larger cylindric ones 2 to 2i feet high ; spines either all radial, or 6 to 8 

 outer ones surrounding 4 stouter central ones ; flowers U inches long ; about 100 rio-id dark pointed 

 sepals upon the ovary are hidden in the wool, those of the tube sinnlar and about as many petals 

 about 30, narrow, yellow, just emerging from the wool ; seeds 2 lines long, wrinkled and minutely 

 tuberculate. •' 



3. CERE US, Haworth. 

 Flowers aboiit as long as wide or elongated. Scales of the ovary distinct, with 

 naked or woolly axils, or almost obsolete and the axils spiny. Berry succulent, 

 covered with spines or scales or almost naked. Seeds black, without albumen. 

 Embryo short and straight or curved or hooked ; cotyledons usually contrary to the 

 sides of the seed. — Plants of all sizes, low or climbing or erect, sometimes enor- 

 mous ; spine-bearing areohx? on vertical ribs. Flowers from the older or, at least, 

 fully formed parts of the plant, not from any preformed areola, but bursting through 

 the epidermis just above the bunches of spines; some open only in sunlight, others 

 only at night, others again are not thus influenced. Fruit often edible, sometimes 

 of very large size. 



§ 1. Low and visually cespitose 2'>lants, mostly with numerous oval or cylindric heads, 

 short flowers, green stigmas, and spiny fruit : seeds snhglobose, covered with con- 

 fluent tubercles : embryo straight, with very short cotyledons. — Echinocereus. 

 1. C. Engelmanni, Parry. Heads several from a single base, oval or cylin- 

 drical, Willi 11 tn 13 interrupted ribs : radial spines about 13, Avhitish, often some- 

 what angled, straight or curved, the lateral ones the longest ; central ones 4, longer, 



