124 THE CACTACEAE. 
Key Tro 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 
than 2 mm. long........ 0.0. cece eee ee ee eee ee enter teeeeeneee . F. lecontet 
Central spines more or less tortuous and spreading; seeds larger than those 
of F. lecontei, more than 3 mm. long............. ee eter eect ences 9. F. acanthodes 
Central spine dagger-like, straight, erect.......... 0... seer cree rece ee eeeee 10. F, santa-maria 
BB. Areoles without marginal hairs or bristles. . ; . 
Spines all alike... 0... cee cc ce eee ne tee eee een enn e teenies 11. F. diguetiu 
Radial spines different from the central. 
Central spines more or less hooked. — 
Ceritral spine 1....... 0. cee ee cee eee teen teen ee ener ene ee eenes 12. F. covillet 
Central spines 4..... 0.0... cece eee ee ee ee tenes cue c ee eee cece ee eee 13. F. peninsulae 
Central spines not hooked. , 
Flowers lemon-yellow; inner perianth-segments elongated...............-. 14. F. rectispinus 
Flowers crimson; perianth-segments all short............. ee cece ee eee 15. F. orcutty 
AA. Plants much smaller than the last, 6 dm. in diameter or less, sometimes, how- 
ever, forming large clumps. 
Areoles with stout spines and weak bristles. ...5..... 5.0.0... e ee eee ee ee eens 16. F. robustus 
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.... 17. F. echidne 
Plant rounded; ribs obtuse; margin of scales of ovary ciliate....... 18. F. alamosanus 
Flowers 2 cm. long, small; plant glaucous............... 000s ee ee ees 19. F. glaucescens 
Scales on ovary linear, with long ciliate margins...................--. 20. F. flavovirens 
Spines more or less curved. 
Flowers small, 3.5 cm. long or less; ribs up to 24.................00++. 21. F, melocactiformis 
Flowers larger; ribs fewer than in the last. 
Scales on ovary acute. ..............4. Tec e cee cece eect ee eeeceeeee 22. F. macrodiscus 
Scales on ovary obtuse. 
Central spines strongly flattened. 0.0.0.0 0.0... cece eee eens 23. F. viridescens 
Central spines nearly terete...... 0.0.0... cece eee ee ee eee eee 24. F. johnsonu 
Some of the spines hooked or recurved at the top. 
Central spines or one of them broad and short. 
Central spine solitary........0.0 0c cc cc cc ce ce ee ce ee cece eee ee eeees 25. F. nobilis 
Central spines several. 
Radial spines all straight... 0.0.0.0... ce eee cece ee eeneee 26. F. latis pinus 
Radial spines on lower side of areoles hooked... ........... 000.0 e ee eee 27. F. crassihamalus 
Central spines slender and elongated. 
Flowers large, yellow......... 0... cee cee ce ce cee cece e eee ee enees 28. F. hamatacanthus 
Flowers small, pinkish to brownish............ 0.0... cc cece cece cc ereees 29. F. uncinatus 
AAA. Species not grouped .......... 2.0. c cece cc cence cece cece eecceeecseeeneneeeenes 30. F. rostit 
\ 1. Ferocactus stainesii (Hooker). 
Echinocactus stainesit Hooker in Audot, Rev. Hort. 6: 248. 1845. 
~e Bicienocactais pilosus Galeotti in Salm-Dyck, Cact. Hort. Dyck. 1849. 148. 
1850. 
es pilosus steinesti* 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. 
Fic. 128.—Section of rib of 
Ferocactus stainesii. 
*This plant was named for Fred. Staines whose nam 
: oe eis sometimes wr 1 : : . 
specific name steinsii used by Salm-Dyck is incorrect. ongly spelled Staine and Steins and hence the 
