^'^ 



26 



THE CACTACEAE. 





Key to Species — continued. 



AA. Flowering arcolcs not confluent, though sometimes close together, not forming a pseu- 



docephalium — continued. 

 Ovary well-developed; flower-tube little scaly or without scales. 

 Flowering areoles without wool, or wool very short. 



Fruit oblong to ovoid 14. C. smithiamis 



.. Fruit globose or depressed. 

 ' Spines acicular; berry large. 



Perianth-segments rounded, acute, or mucronate. 

 > ■- Plant grayish green; at least the perianth-segments rounded 



- • • • • or mucronate. 



Outer perianth-segments rounded 15. C bahamensis 



All perianth-segments rounded 16. C. deeringii 



Plant glaucous green when young, dull green when old; outer 



perianth-segments acute. 

 Much branched, the branches ascending; ribs loto i3;style 



exserted 17. C. rohinii 



Little branched, the branches nearly erect; ribs 9 or 10; style 



scarcely exserted; young growth very glaucous. 1 8. C. keyensis 



Perianth-segments retuse 19. C. m'onodonos 



Spines subulate; berry small...' . .-. ....... ....... .'. . . . .20. C. scoparius 



Flowering areoles definitely long-woolly. 



Ribs 5 to 13, separated by ixarrow valleys. ,: 



Ribs 8 mm. high 01 higher. 



Plant light green to dark green. 



' Spines short, subulate.... .21. C. moritzianus 



Spines slender, acicular. 



Wool of flowering areoles sparse, not matted. .22. C. arrahidae 



^ ■ '- ; Wool of flowering areoles mostly copious, matted. 



. -^' Wool of flowering areoles brown 23. C. urbanianns , 



Wool of flowering areoles white. * > . 

 Plant bright green, shining. 

 Joints slender, dark green; wool short ..24. C, nohilis 



. . T.1 J*^^'^^^ ^^^"^' ^^^^^ ^^^^"' ^^^^ ^^^^- • ••25. C. harbadensis 



Plant dull green, not shining. 



Wool elongated, up to 5 to 7 cm. long..... ;.-..... 26. C. millspatighii ' 

 Wool short, 2 cm. long or less. . > 



^' I r Ribs I to 2 cm. high. } - c /^.: . ,; 1; ,::;:.'" 



'. Only the flowering areoles woolly.:... ...27. C. swartzii - 



Both flowenngand flowerless areoles of young 



' ^_ jointswoolly....... .......... ...:v...... 28. C.polygonus 



- 'l^J^\^ f^^s 8 mm. high or less 29. C, gaumeri 



Plant, at least young joints, blue or bluish green, glaucous 

 Young spines yellow. 



Flower 5 to 6 cm. long. ' '' 



Ribs 6 to 8 ^ n 



Kids mostly 9 to 12. . ' . . 



Ribs 13 ^ \ V" . . J .' 



' ' . , -Diu^ „ ' ' • 32. C. ptauhyensis 



• - '^ Ribs 9 or 10. , : : : ■:, . - ■ .; ^1 . 



Perianth-segments rounded or mucronate ^ ^ ^ 



' '' pj^^^"^"^^^^^^^ C. brooksianus 



Perianth-segments acute.- ^- r rnii^«,v 



Young spines brown or nearly black '^^' royenn 



ireolS L^'o'L'^^^^^ their spines overlapping.".. .'. ..... . .36. C. robuslus 



Areoles separated, their spines not overlappine 

 ■ Ribs 9 to 12. . -: t^f a- 



Wool short, 2 cm. long. C cometes 



Wool 10 cm. long. ... ^Z' ^' f^'"^^^^ , , 



Ribs 7 to 9 38. C. leiicocepnalns 



- ■ Ribs strongly horizontally grooved below the areoles 



Flowers rose-red . . ^ 



Flowers brown ^^- >;• ^^rtorianiis 



Ribs not grooved ' ^o- C- palmen 



Color of plant and of young spines unknown ^'' ^' tweedyanus 



Mexican 



Colombian 42. C alensis 



Ribs only 5 to 6 nimVhigh;' plant green ^^' ^' ^^^^^^^'^ww^ 



Ribs 4 to 6, separated by broad valleys 4"^- ^' purpusii 



SfX''''''''^^'''''"'"^"""^'^^; flowers 6 to 8 cm lone .. r . /• • ; 



Bright green, up to 3 meters hieh- flow^^rc oK^,,* ^"i 45- C. catingicola 



A A A Q • . ^^'^'^ ^^'■>' ^hort and flat ; flower tub^^^^^^^ ^ ''"'* ^"""^ 4^' ^- brasiliensis 



k\k. Species not grouped.....; ;.. tr tube scal>.. ......; ^^ C. phaeacanthus 



, ••••• • ......48. C.ulei 



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