EPIPHYLLUM. 



195 



Type locality: Costa Rica. 



Distribution: Costa Rica. 



This species is an abundant bloomer, flowering in cultivation usually in January but 

 also at other times of the year; its flowers are the smallest of the genus. 



Plate XVI, figure 2, shows a flowering branch from the specimen sent by Mr. Pittier 

 from Zent, Costa Rica, in 1904; plate xviii shows another plant of the same collection 

 which flowered in Washington. 



12. Epiphyllum guatemalense Britton and Rose, Contr. U. S. Nat. Herb. 16: 257. 1913. 

 PliyllocactHS guatemalensis Vaupel, Monatsschr. Kakteenk. 23: 116. 1913. 



Plant rather stout, in cultivation a meter long or longer; old stem woody, with gray bark, 

 terete; branches green, flat, 4 to 8 cm. broad, narrowed at base and there terete, coarsely crenate, 

 obtuse at apex; flower-bud pointed; flowers nocturnal, about 28 cm. long; tube about 15 cm. long, 



Fig. 201. — Epiphyllum guatemalense. 



straight or nearly so, green or yellowish green, somewhat angled, at least below, bearing only a few 

 red-tipped scales ; inner central part of tube densely pilose ; outer perianth-segments scale-like with 

 red reflexed tips; inner pure white, narrow, 8 to 9 cm. long, acuminate; stamens borne on whole 

 surface of rather short throat and therefore in more than one series; filaments pure white; style 25 

 cm. long, somewhat glossy, orange; stigma-lobes orange; ovary pale, bearing a few spreading scales. 



Type locality: Guatemala. 



Distribution: Guatemala, but range unknown. 



Two very distinct forms occur in this species which are hard to explain. They are so 

 different that it seemed at first they must represent two distinct species, as they occur on 

 separate plants. In one (it may be simply the juvenile form) the joints are rather thin and 

 broad (5 to 8 cm. broad), the margins soft, with low broad undulations separated by a narrow, 

 nearly closed sinus; in the other (it may perhaps be the adult form) the joints are stiff 

 and narrow, the margins homy, the undulations with an open triangular sinus. 



Illustration: Contr. U. S. Nat. Herb. 16: pi. 78. 



Figure 201 is from a photograph of the type plant. 



