THK CACTACEAE. 



Ki'V To (iiJNivRA continued. 



CC. Ovary si|ii:iiiiifiT(>ii'i. often aNo lauifrrous, sctiferous, or spiniferous. 



Flowcis in a large lateral pseudocephalium ; coluinnar cacti 4. Esj>ostoa (p. oui 



1'hints vvilliciul a pseudocephalium. 



< >. i! \ squamiferous only; columnar cacti. 

 Scales of the ovary fleshy. 



Flower short-funnelform; scales of ovary anil flower tube acute 5. tinwiiiiiKi" IP- 6.?) 



Flower long-funnelform ; scales of ovary and flower-tube liroail, 



abruptly cuspidate (>. Xli-lMniin i p (. | i 



Scales of the ovary papery 7. Estoiilriti (]>. <..s I 



( ivary squamiferous and also laniferons, felted, or spiniferous. 



Perianth short-campanula tc 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. Corryocactus (p. 66) 

 Corolla withering-peristent; flowers not yellow. 



Fruit dry; columnar cacti .9. Pachycereus (p. 68) 



Fiuit a fleshy berry. 



Tree-like, or bushy cacti H>. Lrplnrerrus (p. 77). 



Columnar cacti 1 1. Eulyi linia (p. 82) 



Corolla short-funnelforrn; 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 13. Erdisia (p. 104) 



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



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



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



Inner perianth-segments as long as tube; rootstocks tuberous. . . 16. Wilcoxia (p. 1 10) 

 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. Peniocereus (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-spined. 1 8. Dendrocereus (p. 113) 

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



Stout, bushy or prostrate cacti, the spines dagger-like, flat. .19. Machaerocereus (p. 1 14) 

 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. 



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



Perianth-segments and filaments short 21. Brackycereus (p. i 20) 



Joints angled .22. Acanthoccrem (p. 121) 



Perianth-tube mostly shorter than the limb; bushy cacti 



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



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



species of Ilarrisia). 

 Perianth-limb regular. 



Perianth funnelform or salverform; tube mostly longer than 



limb. 



Stout, upright cacti, columnar or with columnar branches. 

 Perianth-tube bearing areoles to top; perianth-segments 



broad 24. Trichocereus (p. 130) 



Perianth-tube slender, with few areoles or none; perianth- 

 segments narrow 25. Jasminocereus (p. 146) 



Slender, arching, vine-like or bushy cacti. 



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



Low, bushy cacti 27. Barzicactiis (p. 159) 



Perianth funnelform-campanulate, the tube stout. 



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



Stout, bushy cacti ; scales of flower narrow 20. Binhnmiii ip. 167) 



Perianth-limb oblique; erect or bushy cacti with scarlet flowers. .30. Ralhbunia (p. 169) 

 BB. Perianth subcylindric, 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 dry . .32. Oreocereus (p. 171) 



Flower-tube very short; fruit not dry. . . -33- Facheiroa (p. 173) 



Flowers not borne from a lateral pseudocephalium. 



Perianth-tube elongated, slender; stamens cxserted 34- Cleistocactus (p. 173) 



Perianth-tube very short; stamens included 35- Zehntneretta (p. 176) 



