CCRKUS. 



19 



on the upper side o the tubercle, black-fcltcd ; spines i to 5, aciciilar. about i cm. Ion;; l)rownish- 

 flowering areoles without wool; flowers small, less than 4 cm. Ioiil^ " " " -' "'^°'' "'"''• 



inner perianth-segments rose-colored; fruit small, spineless. 



greenish 



Type locality: Mexico, on red lava bed 

 Distribution: Central Mexico. 



This species is reported by Dr. Purpus from near Tehuacan, Mexico. vv,..x. x.. ivu^c 

 collected It at Tguala Canyon, Guerrero, Mexico, in 1905. This latter specimen is now 



New York 



It is not a true Ccrcus 



nor is it referable to any genus which we know. It is characterized by its peculiar tuber- 



small 



Birkenwerder near Beriin. EchinocOi 

 a synonym. 



Illustration: Schumann, Gesamtb 



Cereus gracilis Haworth, Phil. Mag. i : 



named 



farinosus (Forster. Handb 



1827. Not Miller, 1768. 



Slender, green, nearly erect, terete, simple or with few branches; spines white, at first 2 to several 

 but in age solitary, long; flowers and fruit unknown. 



Typ. 



<< 



America 



and the spines are half as long. 



Haworth this species has the habit of Euph 



Haworth 



very 



pesiifcr), but a careful study of the dcscript 



Cereus tenuis Pfeiffer, Allg. Gartenz. 8: 407. 1840. 



green 



narrow; areoles close together, small, bearing white felt, white wool, and straight, acicular yellow 



solitary 



J 



Cereus subintortus, C. 

 Dyck (Forster, Handb. Ca 



f- » 



/?, 



Salm 



w 



and C. haageanus Salm- 



1846) are, according to Forster, of this relationship. 



Tahrb 



1908. 



Tall, 15 meters high, with simple or few-branched stems; ribs 3, prominent; radial spines 6; 

 central spine i, about 6 mm. long; flowers described as about 10 cm. long and red. 



This species was very briefly described by Schumann. Vaupel (Monatsschr. Kak- 

 teenk. 23: 184. 1913) has described the species at more length but not in sufficient detail 

 to enable us to place it. It is very tall with few strict branches and only 3-angled stems, 

 and with red flowers. It probably is not a Cereus nor is it like any other Peruvian cacti. 



Type locality: Department of Loreto, Peru. 

 Distribution: Northeastern Peru. 

 K. C. Erdis, in 1915, collected at Pumachaca 

 ry peculiar cactus which may be referable hei 



^- 



of about 



500 meters 



be referable here. The small plant which he sent in 

 had only 4 thin wing-like ribs, but the newer growth has 5 ribs; the spines are 6 to o 



dark brown, acicular. 



Illustration: 



small live plant is m the collection at Washingt 



Jahrb. E 



(Willdenow) 



1819. 



Cactus mtdiangularis Willdenow, Enuin. PI. Suppl. 2^2,. 1813. 

 ?Cereus multangularis pallidior Pfciflfer, Enum. Cact. 78. 1837. 

 Echinocereiis miiltangidaris Riimplcr in Forster, Ilaudb. Cact. ed. 2. 825. 1885. 

 Echinocereus multangtdaris pallidior Riimplcr in Forster, Handb. Cact. cd. 2. 825. 



1885. 



Cactus multangularis y when first described, was not sufficiently characterized for iden- 



tification. 



umann associated tlie name 



my 



We 



-i 



