158 



THE CACTACEAE. 



the Balansa specimen (No. 2504, type) here, but not the name, while in his Keys of the 

 Monograph of Cactaceae (p. 17) he recognizes C. balansaei as well as C. bonplandii, referring 

 to the former the Argentine species C. pomanensis. 



Cereus rhodocephalus Lemaire (Cact. Gen. Nov. Sp. 79. 1839) is cited as a synonym of 

 Cereus bonplandii. • 



We do not know Cereus urea- 

 canthus Forster, (Hamb. Gartenz. 

 17:166. 1 861); it is recorded as orig- 

 inally from Peru. Forster thought it 

 might come next to Cereus bonplandii, 

 but no species of this relationship have 

 heretofore been reported from Peru. 



Illustrations: Rep. Mo. Bot. 

 Gard. 16: pi. 10, f. 3, 4, both as 

 Cereus bonplandii. 



Plate xxiv, figure 2, represents a 

 fruiting branch of a plant in the collec- 

 tion of the New York Botanical Gar- 

 den. Figure 227 is from a photo- 

 graph taken by Dr. Shafer at Salta, 

 Argentina, in 191 7. 



17. Harrisia guelichii (Spegazzini) . 



Cereus guelichii Spegazzini, Anal. 

 Mus. Nac. Buenos Aires III. 4: 

 482. 1905. 



Branching, high-climbing on trees, 

 up to 25 meters long, the branches 3 to 

 5 cm. thick, 3 or 4-angled ; ribs acute, un- 

 dulate ; radial spines 4 or 5 ; central spine 

 1, stouter than the radials; flowers large, 

 green without; scales on the ovary and 

 flower-tube prominent, nearly naked in their axils ; fruit globular, strongly tuberculate, spineless, 

 red, 4 to 4.5 cm. in diameter; pulp white, very sweet, edible. 



Type locality: In the Chaco, Argentina. 



Distribution: Argentina. 



We have a living specimen of this species brought by Dr. Rose from Argentina in 1915 ; 

 from Dr. Spegazzini's description this must be the most elongated cactus known. 



Illustration: Monatsschr. Kakteenk. 19: 19, as Cereus guelichii. 



Figure 228 is from a photograph of a plant grown in the garden of Dr. Spegazzini, 

 La Plata, Argentina. 



PUBLISHED SPECIES, PERHAPS OF THIS GENUS. 



Cereus jusbErTii Rebut in Schumann, Gesamtb. Kakteen 137. 1897. 



Eriocereus jusberlii Riecobono, Boll. R. Ort. Bot. Palermo 8: 240. 1909. 



Somewhat erect, from the first more or less branched; ribs 6, usually low, with broad intervals; 

 spines very short, the centrals a little longer than the radials; flowers funnelform; inner perianth- 

 segments white; stigma-lobes numerous, linear, about 12, green; scales on ovary and tube with long 

 hairs in their axils. 



This plant, now common in living collections, is generally believed to be a hybrid. 

 Berger says, "According to repeated assurances of Abbe Beguin, it is a hybrid between an 

 Echinopsis and a Cereus raised by him." 



Illustrations: Bliihende Kakteen 2 : pi. 78 ; Schumann, Gesamtb. Kakteen f . 32 ; Mollers, 

 Deutsche Gart. Zeit. 26: 305. 



Fig. 228. — Harrisia guelichii. 



