APPENDIX. 



We bring together here records of some species described in Germany during the war 

 period, 1916-1918, cited from periodicals only recently received in the United States, 

 together with a few supplementary observations upon other species described in this 

 volume. 



Cereus hexagonus. (See page 4, ante. ) 



Dr. Britton has recently studied this species on the western mainland of Trinidad 

 and the small islands, Gasparee, Monos, and Chacachacare, adjacent. Here it inhabits 

 rocky hillsides, attaining a height up to 15 meters; planted individuals observed were con- 

 siderably taller. At St. Joseph large numbers of young plants up to 4 meters tall were 

 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 Ccrcus is usually 4-ridged when young, becoming 6-ridged later in life, many 

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



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



Cereus chalybaeus. (See page 16, ante.) 



Cereus beysiegelii (Monatsschr. Kakteenk. 29: 48. 1919) is an abnormal form, similar 

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

 on account of its black spines and turquoise-green skin. Its origin is unknown. 



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Fig. 304. — Section of flowering branch 

 of C. grenadensis. 



Fig. 303. — Cereus grenadensis 



23. Cereus grenadensis sp. now (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 t 

 cm. high, transversely grooved above each areole; areoles about 1 cm. apart, borne in slight depres- 

 sions of the ribs, gray-pulverulent; 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 morning, the buds rounded ; outer perianth-segments with broad purple rounded or apicu- 

 late tips, the few inner ones rounded, purplish; ovary oblong, with a few naked areoles; stamens 

 many, not exserted; immature fruit green, ellipsoid, 3 to 4 cm. long. 



