CEREUS. 



11. Cereus dayamii Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 4S0. 1905. 



Tree-like, 10 to 25 meters high, with a cylindric trunk; branches 5-ribbed or 6-ribbed; ritis 3 

 em. high, pale green; areoles orbicular, large, 5 to 6 mm. in diameter; spines few or wanting, when 

 present 4 to 12 mm. long, brown with a yellowish base; flowers funnelform, large, glabrous, up to 

 25 cm. long; inner perianth-segments white; fruit oblong, glabrous, red without, 6 to 8 cm. long; 

 pulp white, edible; seeds black. 



Type locality: Near Colony of Resistencia, Chaco, Argentina. 



Distribution: Southern Chaco, Argentina. 



Figure 1 1 is from a photograph given to Dr. Rose by Dr. Spegazzini. 



12. Cereus argentinensis nom. nov. 



Cereus platygonus Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 481. 190.5. Not Otto. 1850. 

 Erect, S to 12 meters high, with a definite trunk; branches numerous, stout, curved at base 

 but soon erect, 10 to 15 cm. in diameter; ribs 4 or 5, 4 to 5 cm. high, thin in section, separated by 

 wide intervals; radial spines 5 to 8, brownish, 3 to 5 cm. long; central spines 1 or 2, 10 cm. long; 

 flowers funnelform, large, 17 to 22 cm. long, 

 inodorous ; outer perianth-segments green or 

 reddish at tips; inner perianth-segments 

 white; fruit glabrous, smooth. 



Type locality: Central Chaco, Argen- 

 tina. 



Distribution: Territory of the Chaco, 

 Argentina. 



This species must be close to C. 

 stcnogonus, as suggested by Berger, 

 although Spegazzini says it is distinct; 

 it must also be closely related to C. 

 dayamii. 



Figure 12 is from a photograph of 

 a plant of C. platygonus Spegazzini, in 

 Dr. Spegazzini's garden at La Plata, 

 Argentina. 



13. Cereus peruvianus (Linnaeus) Miller, 

 Gard. Diet. ed. 8. No. 4. 1768. 



Cactus peruvianus Linnaeus, Sp. PI. 467. 1753. 

 ICereus calvescens De Candolle, Mem. Mus. 



Hist. Nat. Paris 17: 116. 1828. 

 ICereus spinosissimus Forster, Hamb. Gartenz. 



17: 165. 1861. 



Usually tall, said to reach 16 meters 

 in height, tree-like, with a large much 

 branched top; branches 10 to 20 cm. in 

 diameter, usually green, sometimes glaucous, 

 with 6 to 9 ribs, sometimes as few as 4; 

 spines acicular, 5 to 10, brown to black, 1 to 



3 cm. long; flower rather large, about 15 

 cm. long, with a thick tube; upper scales and outer perianth-segments obtuse, red or brownish; 

 inner perianth-segments oblong, white; fruit subglobose, orange-yellow, somewhat glaucous, about 



4 cm. in diameter; seeds black, 2 mm. broad, rough. 



Type locality: Uncertain. Linnaeus says it is from Jamaica and the arid coast of 

 Peru. No native Cereus is known either from Jamaica or Peru. It was called Cereus 

 peruvianus by Bauhin in 1623 but no station was given. Our description applies to the 

 plant from the southeastern coast of South America for which the name Cereus peruvianus 

 has been used by most recent authors. 



