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HYLOCERIiUS. 



183 



from a photograph taken by C. H. T. Townsend near Chosica 



much 



Arequipa in 1914; figure 259 shows a cluster of spines obtained by Dr. Rose 



from 



New 



^ 



1 



Subtribe 2. HYLOCEREANAE. 



Elongated, vine-like, climbing, trailing or pendent, branched 



roots 



\porocachi 



angled, ribbed, fluted, or rarely flat, 

 flowers mostly large and white, rarely red or 

 less oblique; fruit a fleshy berry, often large. 



We group the species known to us in 9 genera. 



. ^ . Key to Genera. 



A. Jomts angled, ribbed, winged, or fluted. 



Ovary and fruit covered with large foliaceous scales, their axils neither spiny, hairy, nor bristly; 



T> • 1, I, , ^^^^^''s mostly large, nocturnal; stems and branches 3-an^lcd or 3-wingcd. 



Ferianth-tube elongated; flowers very large, their scales naked in the axils r. Hylocereus (p 181) 



Penanth-tube scarcely any; flowers small, some of their scales with tufts of short 



hairs and occasional bristles in the axils 2. Wilmattea (p. 195) 



Uvary and frmt not bearing laige foliaceous scales, their axils spiny, hairy, or bristly. 

 Flowers elongate-funnelform, very large, mostly nocturnal, the tube and ovary 



usually bearing scales, hairs, or spines. 



Stems ribbed, fluted, or angled.. '. 3, Sdcniccrcus (p. iy6) 



Stems winged. 



Areoles of ovary and flower-tube bearing felt and spines subtended by 



short scales; flowers nocturnal ^ 4. Mediocadus fp. 210) 



Areoles of ovary and flower-tube bearing long hairs; flowers diurnal 5. Deamia (p. 2 1 2) 



Flowers short-funnelforrn or funnelform-campanulate. 

 Perianth-limb regular, the tube stout; flowers white. 



Tube of the flower bearing short foliaceous scales; areoles of the tu!>crcu- 



late ovary bearing long hairs 6. Webcroccrcus (p. 214) 



Areoles of flower-tube and of non-tuberculate ovary beaiing short black 



spines . i 7. Werchleocereus (p. 216) 



Perianth-limb somewhat oblique, the tube slender; flowers pink 8. Aporocaclus (p. 2 1 7) 



AA. Joints flat <>. Strophocactus (p. 221) 



1. HYLOCEREUS (Berger) Britton and Rose, Contr. U. S. Nat. Herb. 12: 428. 1909. 



Climbing cacti, often epiphytic, with elongated stems normally 3-anglcd or 3-wingcd, and 

 branches emitting aerial roots, the areoles bearing a tuft of felt and several short spines, or spineless 



growths often bearing 



ovary 



wool, or hairs; outer perianth-segments 

 gments 



white, rarely red; stamens very many, in two series, equaling or shorter than the style; style cylin- 

 dric, rather stout and thick, the linear stigma-lobes numerous, simple or branched; fruit spineless 



seeds 



We 



I 



ivate, acute, cormate a 



West Indies. Mexico 



America. Most of them 



- J- 



Type species: Cactus triangularis Linnaeus. 



The name is from the Greek, meaning forest-cereus. 



* Key to Specihs. 



A. Areoles spiniferous; ribs not deeply crenate. 



B. Stems bluish or more or less whitened or gray. 



Margin of joints horny. 



^"^^"ouSr^erianth-segmcnts acuminate, as long as the inner white ones. ... i. II. guakmalcnsis 

 SSSnth-segments acute, much shorter than mncr.golden-tipM ones. 2. H. purpu^n 



Spines acicular, slender. , i . • ♦^ t 7T nrnnihnftt\ 



"^ Outer peiianth-segments linear-lanceolate, acummate 3. //. ^«"^^««.^ 



Outer perianth-segments oblong-lanceolate, obtuse 4- 'i- bronxensts 



Margin of joints not homy; spines few, come. 



Branches slender, 4 cm. thick or less, scarcely crenate. ^^ polyrhhus 



Stigma-lobes entire 



Stigma-lobes bifid 



Branches stout, 5 to 10 cm. thick 



* * 



5a.//. veneziidensis 

 6. IL costaricensis 







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