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 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, 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. 



FIG. 303. Cereus grenadensis. FIG. 304. Section of flowering branch 



of C. grenadensis. 



23. Cereus grenadensis sp. nov. (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 g-ribbed, the ribs about I 

 cm. high, transversely grooved above each areole; areoles about i 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 orapicu- 

 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. 



