46 THE CACTACEAE. 
ous, straight, rigid; radial spines 15 to 20, 10 to 30 mm. long, whitish; inner spines 3 to 6, stouter 
than the radial ones, deep brown above; flowers large, 5 to 7 cm. broad, rose-colored; outer perianth- 
segments 30 to 40, linear-subulate, with fimbriate margin; inner perianth-segments 40 to 50, lan- 
ceolate-linear, attenuate ; stigma-lobes 8 to 10, white; fruit oval, green; seeds compressed, light brown, 
pitted. 
Type locality: Northern Arizona. 
Distribution: Northern Arizona, especially along the Upper River of the Grand Canyon, 
and perhaps also in southern Utah.* 
Mammillaria arizonica Engelmann, when first described, was a complex. Engelmann 
states that it was found ‘‘on rocky and sandy soil in northern Arizona from the Colorado 
eastward (Coues, Palmer, F. Bischoff) and into southern Utah (J. E. Johnson) ; probably in 
southeastern California.” Engelmann afterwards described Johnson’s plant from Utah 
as M. chlorantha and the California plant is doubtless his M/. deserti. We have in the U. 5. 
National Herbarium Palmer’s specimen from Arizona but we have not seen the plant of 
Coues nor of Bischoff. 
Fics. 44 and 45.—Coryphantha deserti. 
The northern range of this species is very uncertain. Engelmann extended it into 
southern Utah. 
Plate v, figure 5, shows a plant sent by M. A. H. Spencer from 
the Grand Canyon, Arizona, in May 1907, which afterwards flowered 
in Washington. 
7 34. Coryphantha deserti (Engelmann). 
_? Mammillaria desertt Engelmann, Bot .Calif. 2: . 
© Cactus radiosus deserti Coulter, Contr. U.S. Nat. Herb rae 18 
Cactus radtosus alversonit Coulter, Contr. U. S. Nat. Herb 3: 122.18 
Mammillaria alversonit Zeissold, Monatsschr. Kakteenk 5: © 18 % 
Mammillaria radiosa alversonit Schumann, Gesamtb. Kakteen, 81 on 8 
Mammillaria radiosa deserti Schumann, Gesamtb. Kakteen 48 1898 ” 
Solitary or cespitose, usually cylindric, sometimes 2 dm. high, 6 to 9 cm. 
in diameter, densely covered with spines; radial spines white except at tip Bre. Ore Rrower ° 
’ - Geserti. 
* Our Utah reference is based on some detach 
Dr. C. D. Marsh in 1922. Both collections came frome weve ected by M. E. Jones and a barren plant sent by 
. cag, ERNE emma. 9 “hela it ag CE ay. CC gn “Ne Ae 
