igo 



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: 256. 1913. 

 Fhyllocactus 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; 

 flo%vers white, the tube slender, about 7 cm. long; inner perianth-segments about 6 cm. long; ovary 

 and most of the flower-tube quite naked. 



Fig. 197. — Epiphyllum caudatum. 



Type locality: Near Comaltepec, Oaxaca, Mexico, altitude 540 to 900 meters. 



Distribution: Known only from the type locaUty. 



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 Juarez. 



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. 

 Fhyllocactus 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, spreading or reflexed, acute, 4 cm. long, lemon-yellow; 

 inner perianth-segments pure white, nearly as long as the outer, broader and more erect, short- 



