190 THE CACTACEAE. 
Type locality: Guatemala. 
Distribution: Lowlands of Guatemala. 
This species has frequently been collected in Guatemala and is usually called Epiphyl- 
lum pittieri, which it somewhat resembles in the size of the flower, but the style is always 
white. 
The flowers are night-blooming and sweet-scented. ‘The fruit is much sought after 
by the Guatemalan Indians, who call it pitahaya. 
The above description is based on living specimens, full notes, and drawings, fur- 
nished by Harry Johnson, a very keen observer, at one time stationed in Guatemala. 
Figure 196 is copied from pencil sketches made by Mr. Harry Johnson at Chama, 
Alta Verapaz, Guatemala, in 1920. 
4. Epiphyllum caudatum Britton and Rose, Contr. U. S. Nat. Herb. 16: 2 56. 1913. 
Phyllocactus caudatus Vaupel, Monatsschr. Kakteenk. 23: 116. 1913. 
Old stems terete and slender; lateral branches elongated-lanceolate, cuneately narrowed at base 
into a terete stalk, long-acuminate, 15 to 20 cm. long, 3 to 4 cm. wide, the margins low-undulate; 
flowers white, the tube slender, about 7 cm. long; inner perianth-segments about 6 cm. long; ovary 
and most of the flower-tube quite naked. 
Fic. 197.—Epiphyllum caudatum. 
Type locality: Near Comaltepec, Oaxaca, Mexico, altitude 540 to 900 meters. 
Distribution: Known only from the type locality. 
We have seen no specimens of this species except the type, but Dr. B. P. Reko, under 
date of June 28, 1919, wrote that he had seen the plant not only at Comaltepec, but at 
other places in the Sierra Judrez. 
A plant sent from Chiapas, Mexico, by Dr. C. A. Purpus in 1920 has joints with 
similar acuminate tips, but the margins are indented. We do not know its flowers. 
Figure 197 is from a photograph of the type specimen. 
5. Epiphyllum darrahii (Schumann) Britton and Rose, Contr. U. S. Nat. Herb. 16: 256. 1913. 
Phyllocactus darrahii Schumann, Gesamtb. Kakteen Nachtr. 69. 1903. 
Stems much branched, often terete and woody below; joints rather thick, 2 to 3 dm. long, 3 
to 5 cm. wide, deeply lobed, sometimes nearly to the midrib, the lobes usually obtuse; tube of 
flower 9 cm. long, somewhat curved, greenish; scales on tube and Ovary small, linear, green, ap- 
pressed; outer perianth-segments 10, linear spreadin 
10, , g or reflexed, acute, 4 cm. long, lemon-yellow; 
inner perianth-segments pure white, nearly as long as the outer, broader and more erect, short- 
