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APPENDIX. 



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We bring together here record^ of some species described in Germany 



period, 19 16-19 1 8, cited from 



together with 

 volume. 



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only recently received in the United States, 

 nations upon other species described in this 



Cereus hexagonus. (See page 4, ante.) 



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Dr. Britton has recentlv studied this soecies on the western mainland 



small islands. Gasoaree, Monos 



Here 



meters 



siderably taller. 



St. Joseph large numbers of young plants up to 4 meters 



seen growing upon branches of saman trees, evidently germinated from seeds carried by 

 birds from the fruit of large planted specimens nearby, an interesting illustration of in- 

 duced epiphytic habit of a typically saxicolous plant. Repeated field observations showed 

 that this Cereus is usually 4-ridged when young, becoming 6 -ridged later in life, many 

 plants bearing some joints 4-ridged, some 6-ridged. 



Illustration: Loudon, Kncycl. PI. 410. f. 6854, as Cactus hexagonus. 



Cereus chalybaeus. (See page 16, ante.) 



Cereus hey siegelii (Monatsschr. Kakteenk. 29: 48. 19 19) is an abnormal form, similar 

 to Cereus peruvianus monstrupsus, which Mr. W. Weingart says looks like Cereus chalybaeus 

 on account of its black spinies and tiirquoise-green skin. Its origin is unknown. 



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Fig. 303. — Cereus grenadensis. 



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Fig. 304. — Section of flowering branch 



of C. grenadensis. 



grenade 



(See page 18, ante.) 



Tall much branched, up to 7 meters high, the trunk short, sometimes 2.5 dm. in diameter, 

 the branches grayish green, erect-ascending, about 7 cm. in diameter, 7 to 9-ribbed, the ribs about i 

 cm hieh transversely grooved above each areole; areoles about i cm. apart, borne m slight depres- 

 sions of the ribs, gray-pulverulcnt; spines about 17, subulate, straight, brownish or gray, the largest 

 about 2 cm long, the shortest about 3 mm, the central one often twice as long as any of the others; 

 flowers many, borne towards the ends of the branches, about 7 cm. long, short-funnelform, open in 

 the early mornine, the buds rounded ; outer perianth-segments with broad purple rounded orapicu- 



fruit 



purplish 



223 





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