124 
the; cactaceae. 
Key to Species— continued. 
Central spine straight or more or less curved, but not hooked. 
Central spines flexible, thin. 
Central spines more or less appressed; seeds very small, not angled, less 
of F. lecontei, more than 3 mm. long . 
Central spine dagger-like, straight, erect.. . . 
BB. Areoles without marginal hairs or bristles. 
Radial spines different from the central. 
Central spines more or less hooked. 
Central spines not hooked. 
ever, forming large clumps. 
Areoles with stout spines and weak bristles. 
Areoles with stout spines only. 
Spines never hooked. 
Spines all straight. 
Scales on ovary broader than linear and not with long ciliate margins. 
Flowers 4 to 5 cm. long, large; plant green. 
Plant flattened; ribs acute; margin of scales of ovary not ciliate ... 
Plant rounded; ribs obtuse; margin of scales of ovary ciliate. 
Spines more or less curved. 
Flowers small, 3.5 cm. long or less; ribs up t 
Flowers larger; ribs fewer than in the last. 
Scales on ovary acute. 
Scales on ovary obtuse. 
Central spines strongly flattened. 
Central spines nearly terete. 
Some of the spines hooked or recurved at the top. 
Central spines or one of them broad and short. 
Central spine solitary. 
Central spines several. 
Radial spines all straight. 
Radial spines on lower side of areoles hooke< 
Central spines slender and elongated. 
Flowers large, yellow. 
Flowers small, pinkish to brownish. 
AAA. Species not grouped. 
. 8. 
e 
F. lecontei 
• 9- 
F. acanthodes 
F. santa-maria 
F. diguetii 
F. covillei 
F. peninsulae 
■ 14- 
F. reclispinus 
• 15. 
T- 
F. orcuttii 
. l6. 
F. robustus 
■ 17- 
F. echidne 
. 18. 
F. alamosanus 
• 19- 
F. glaucescens 
. 20. 
F. flavovirens 
F. melocactiformis 
F. macrodiscus 
• 23- 
F. viridescens 
• 24. 
F. johnsonii 
■ 25. 
F. nobilis 
F. latispinus 
. 27. 
F. crassihamalus 
. 28. 
F. hamalacanthus 
. 29. 
F. uncinatus 
. 30. 
F. rostii 
1. Ferocactus stainesii (Hooker). 
Echinocactus stainesii Hooker in Audot, Rev. Hort. 6: 248. 1845. 
, Echinocactus pilosus Galeotti in Salm-Dyck, Cact. Hort. Dyck. 1849. 148. 
1850. 
Echinocactus pilosus steinesii* Salm-Dyck, Cact. Hort. Dyck. 1849. 149. 
1850. 
Simple or proliferous, globular to columnar, up to 1.5 meters high; 
ribs 13 to 20, compressed, more or less undulate; areoles distant, circular; 
radial spines reduced to long white hairs; central spines several, subulate, 
at first purplish, becoming pale yellow in age; flowers yellow; fruit 
unknown. 
Type locality: Not cited. 
Distribution: San Luis Potosi, Mexico. 
This species differs from the following one in having more 
distant ribs, the areoles more widely separated, the spines duller 
colored, more numerous, somewhat curved, two of them decidedly 
flattened and the hairs white. We know the plant only from 
description and illustrations. 
Fig. 128.—Section of rib of 
Ferocactus stainesii. 
*This plant was named for Fred. Staines whose name is sometimes wrongly spelled Staine and Steins and hence the 
specific name steinsii used by Salm-Dyck is incorrect. 
