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 xvu1 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. 
Phyllocactus 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, 
Fic. 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-segment® scale like w th 
red reflexed tips; inner pure white, narrow, 8 to 9 cm. long, acuminate; stamens Pore on whole 
surface of rather short throat and therefore in more than one series; filaments pure Ww nite : S yle 25 
em. 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 whic 
different that it seemed at first they must represent two Sp ( 
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 sti 
and narrow, the margins horny, the undulations with an open triangular sinus. 
Illustration: Contr. U. S. Nat. Herb. 16: pl. 78. 
Figure 201 is from a photograph of the type plant. 
h are hard to explain. They are so 
distinct species, as they occur on 
