Globular, 3 dm. in diameter or more; ribs 13, broad, 2 cm. high, obtuse, not tubercled; areoles 1.5 to 2.5 cm. apart, large; radial spines 8 to 12, acicular, spreading, white, 3 to 4 cm. long; central spines 6 to 8, very diverse, all reddish, either spreading or porrect, all straight except 1, this much elongated, often 12 cm. long, much flattened, very strongly hooked; flowers and fruit unknown.
Collected by J. N. Rose on San Francisquito Bay, Lower California, April 9, 1911 (No. 16746).
Only very small plants of this species were obtained by Dr. Rose during his hurried visit at this locality in 1911. Larger plants will doubtless be found in this same region. Indeed, Ivan M. Johnston has reported seeing a plant there of this relationship which was a meter high. This species, while most closely related to F. wislizeni, is much more strongly armed. It has, perhaps, the most formidable spine-armament of any species of this genus; the central spine is not so long as in No. 14, but is stouter and more strongly hooked.
1. Flowering plant of Ferocactus viridescens.
2. Top of flowering plant of Ferocactus rectispinus.
(All natural size.)
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