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THE cactace;ah. 



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Key. to Genera — continued. 



CC Ovary sqimmiferous, often also laniferous, setiferous, or spinifcrous. ^ . , / ^ \ 



Flowers in a large lateral pseftdocephalium; columnar cacti 4- I^spostoa (,p. oo; 



Plants without a pseudocephalium. 



Ovary squamifcrous only; columnar cacti. ' 



. - Scales of the ovary fleshy. - - - r ^' \ 



Flower short-funnel form ; scales of ovary and flower-tube acute 5- Browmngta {p. 63) 



Flower long-funnelform; scales of ovary and flower-tube broad, . , ' x 



,. . abruptly cuspidate.... 6, Stcfsonm {p. 6^} 



Scales of the ovary papery ; ., : 7- Escontna (p. 65} . 



Ovary squamifcrous and also laniferous, felted, or spinifcrous. . _ , . 



>> Perianth short-campanulate or short-funnel form, its tube short or thick. 



Plants mostly stout, columnar, and erect, ribbed or angled; a few ,- 



species spreading or prostrate; rootstocks not tuberous. 



Corolla short-campanulate. 



Corolla falling away by abscission, yellow; columnar cacti 8. Corryocadiis (p. 66) 



Corolla withering-peristent; flowers not yellow. 



Fruit dry; columnar cacti 9- Pachyccreus (p. 68) 



Fruit a fleshy berry. 



Tree-like, or bushy cacti 10. Leptocercus (p. 77) 



^ Columnar cacti,.^, . . . . . . . n- Eiilychnia (p. 82) 



Corolla short- funnelform; fruit fleshy. 



Mostly columnar cacti with stout stems, the white to pink 



flowers not widely expanded 12. Lemaireocereus (p. 85) 



Slender or low cacti, with bright red, scarlet, or yellow, widely 



expanded flowers. 



Branches slender, few to several-ribbed i3- Erdisia (p. 104) 



Branches stout, closely many-ribbed 14. Bergerocacttis (p 107) 



' Stems very slender, nearly terete or with many low ribs. 



Inner perianth-segments much shorter than tube 15. Leocereus (p. 108) 



Inner perianth-segments as long as tube; rootstocks tuberous. . . 16. Wilcoxia (p. no) 

 ■/ J Perianth funnelform, funnelform-campanulate, or salverform. 



Areoles of the ovary spinuliferous or setiferous (see Ilarrisia). 



Slender cacti, with an enormous fleshy root; flower salverform. . 17. Pcniocereus (p. 112) 



Stout or slender cacti, without a large fleshy root; flower funnel- 

 form. ' 



Tree-like cacti; fruit with a thick woody rind; ovary few-spincd. 18, Dendrocercus (p. 113) 

 Prostrate or bushy or vine-like cacti ; fruit fleshy. 

 Stout, bushy or prostrate cacti, the spines dagger-like, flat. .19. Machaerocerciis (p. 114) 

 Slender or weak cacti, the spines acicular or subulate. 



Perianth-tube as long as the limb or longer; elongated 

 cacti with white flowers. 

 Joints ribbed. V. 



Perianth-segments and filaments elongated 20. Nycloccreus (p. 117) 



Perianth -segments and filaments short 21. Brachycereus (p. 120) 



Joints angled. 22. Acanthocereus (p. 121) 



Perianth-tube mostly shorter than the limb; bushy cacti 



usually with scarlet flowers .23. Ileliocereus (p. 127) 



^ j, Areoles of the ovary laniferous or felted (also setiferous in some 

 xi species of Harrisia). - 



Perianth-hmb regular. * * . 



Perianth funnelform or salverform; tube mostly longer than . . ^ 



Stout, upright cacti, columnar or with columnar branches. ' \ ' 



Perianth-tube bearing areoles to top; perianth-segments 



% -n .^^^^^ ' • • 24. Trichoceretis (p. 130) 



Penanth-tube slender, with few areoles or none; pcrianth- 



segments narrow 25. Jasminocereiis (p. 146) 



blender, arching, vine-like or bushy cacti. 



Arching or vine-like cacti........ 26. Harrisia (p. 147) 



Low. bushy cacti _ .27. Borzicactus (p. 159) 



Penanth funnel form-campanula te, the tube stout. 



Gigantic, columnar cacti; scales of flower broad 28. Carnegiea (p 164) 



Stout, bushy cacti ; scales of flower narrow. 29. Binghamia (p. 167) 



T^R Ppri.ntli cnh../f^'^ *%; r u^l"^"^^' '^^''^^ *^^ bushy cacti with scarlet flowers. .30. Rathbunia (p. 169) 

 BB, Perianth subcyhndnc, the limb short or none 



Scales when present on the ovary and flower-tube naked in their axils 31. Arrojadoa (p 170) 



Scales on the ovary and flower-tube laniferous in their axils 

 Flowers borne from a lateral pseudocephalium 



Flower-tube elongated; fruit ch-y .-, Oreocereus (n 171^ 



Flower^tulje very short; fruit not dry ' ^ * f/ Facher7a (o ,7.) 



Flowers not borne from a lateral pseudocephalium ^^' '^^^^^^'^''^ *^P' '73) 



Penanth-tube elongated, slender; stamens exserted ^. Cleislocadus fo mx\ 



Penanth-tube very short; stamens included. . : ; ; '. ; '. ^',1 SnS?a t \]V) 



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