HYLOCEREUS. 185 



bottom of each undulation; spines 5 to 8, acicular, 5 to 12 111111. long; flowers 25 to 30 cm. long and 

 fully as broad; outer perianth-segments narrow, long-acuminate, greenish, spreading or reflexed; 

 inner perianth-segments oblong, acuminate, white; style stout; stigma-lobes linear, entire, green; 

 ovary covered with imbricated, ovate, acute, purplish-margined scales. 



Type locality: Mexico or Colombia. 



Distribution: Mexico? 



The above flower description is drawn from New York Botanical Garden specimens 

 which bloomed in 1912 (No. 6170). The species is known to us from cultivated plants only. 



Mr. Weingart is strongly of the opinion that Cereus napoleonis Graham is the same as 

 this species and, if so, this name should be used. He states that C. napoleonis was described 

 from an old plant, while the other species was described from young plants, which, he 

 thinks, would account for the differences in the descriptions. We believe, however, that the 

 two species are distinct and that C. napoleonis is much nearer H. triangularis. 



Illustration: Monatsschr. Kakteenk. 23: 29, as Cereus ocamponis. 



Plate xxvii [ shows a flowering joint of a plant in the collection of the New York 

 Botanical Garden. 



A species related to H. ocamponis but probably distinct was collected by T. S. Brande- 

 gee on rocks of Cerro Colorado, Sinaloa, Mexico, November 1904. Mr. Brandegee states 

 that it is also epiphytic on trees. Rose, Standley, and Russell collected the same species 

 at Villa Union, near Mazatlan, in 1910, but, although we have had it in our collections 

 ever since, it has not yet flowered. 



4. Hylocereus bronxensis sp. nov. 



Joints strongly 3-angled, dull grayish green, 3 to 4 cm. broad; ribs strongly undulate, the margins 

 horny and brown; areoles 2 to 3 cm. apart; spines about 10, acicular, brown in age, about 6 mm. long; 

 flowers 25 cm. long; outer perianth-segments broad, ovate, obtuse or rounded; inner perianth- 

 segments oblong, rounded at apex, more or less apiculate, but not long-acuminate; scales on the 

 ovary broad; stigma-lobes (perhaps) bifid. 



Described from specimens which flowered in the New York Botanical Garden (No. 

 9722) June 28, 1912. The plant was obtained from G. E. Barre in 1902, but its origin is 

 otherwise unknown. It is related to Hylocereus ocamponis but its flowers are quite different 

 from those of that species. 



5. Hylocereus polyrhizus (Weber). 



Cereus polyrhizus Weber in Schumann, Gesamtb. Kakteen 151. 1897. 



Slender vines, sometimes only 3 to 4 cm. thick, normally 3-angled, at first green or purplish, 

 but soon becoming white and afterwards green again ; ribs or wings comparatively thin although in 

 age becoming more turgid; margin nearly straight, obtuse, not horny; spines 2 to 4, rather stout, 

 brownish, 2 to 4 mm. long, sometimes accompanied by two white hairs or bristles which finally drop 

 off; young flower-buds globular, purple; flowers 2.5 to 3 dm. long or longer, strongly fragrant; outer 

 perianth-segments linear-lanceolate, more or less reddish, especially at the tips; inner perianth-seg- 

 ments nearly white; stigma-lobes rather short, yellowish, entire; ovary covered with approximate 

 ovate scales, with red or deep purple margins; fruit scarlet, oblong, 10 cm. long. 



Type locality: Colombia. 



Distribution: Colombia and Panama. 



The original description of Cereus polyrhizus was, apparently, based on the juvenile 

 state of the species for the branches are described as 5-angled; Weingart (Monatsschr. 

 Kakteenk. 22: 106) associates the plant with the group in which we place it, and plants sent 

 to the New York Botanical Garden in 1901 by M. Simon of St. Ouen, Paris, who had in his 

 collection many cacti described by Weber, are, apparently, the same as others since obtained 

 from Panama and Colombia; perhaps also from Ecuador. 



