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HARRISIA. 



147 



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Fl--^.' 



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about I cm. high, separated by broad, rounded intervals; areoles rather close together i cm apart 

 or less, bearmg brown felt; spines various as to length, sometimes only i cm. long, sometimes 8 cm 

 long, usually slender, sometimes bristle-like, often 10 or more at an areole; flowers various in size 

 5 to 11 cm. long, "chocolate-brown with yellow stripes" ; outer perianth-segments spatulate, 2 to 3 



perianth 



tube 



fruit greenish, short-oblong, 5 cm. long, 4 cm. in diameter, with a thin tough rind, palatable. 



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7>/?^ /ocaK/j; St. Charles Island, Galapagos." 



jDf5/n6M/iow; Various islands of the Galapagos group. 



This species and the other cacti of the Galapagos Islands were discovered by Charles 

 Darwin in 1835. He associated this species with Cereus pcruvianus, which it resembles 

 only in its large cylindric trunk. The various collectors who have since visited these 

 islands have noted this striking plant, but Httle material has been collected and even to-day 

 our knowledge is very liiiiited. 



W. Botting Hemsley has written most interestingly of the cactus flora of the islands 

 (Gard. Chron. III. 24: 265, 266. 1898; 27: 177, 178. 



V. ,' ". 



900 



Mr. Alban Stewart, who made 



(p 



.^ 



He recognizes two columnar arborescent species under the names Cereus galapagen 

 Weber and Cereus sclerocarpus Schumann, and indicates that they may be distinguished 

 habit characters, but remarks particularly on the great variability of the flowers of both. 



Illustrations: Proc. Calif. Acad. Sci. 

 IV. I : pi. 6, 16, as Cereus sclerocarpus ;Ga.Td. 

 Chron. III. 27: 185. f. 61, as Cereus sp.; 

 Wolf, Geographia y Geologia del Ecuador 



.^n 



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t<- 



16, 20. 



Mus. Comp 



from 



plant in its natural habitat on Charles 

 Island, Galapagos, contributed by the 

 United States Fish Commission; figures 



from 



1906. 



num specimen i 

 )rnia Academy c 

 ban Stewart (N 



collected 



1905 



and 



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1 



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'fr 1 



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Figs. 213 and 214. — Flowers of J. galapagensis. X0.6. 



. 1 



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P 4 





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26. HARRISIA 



908 



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obono. Boll. R. Ort Bot. Palermo 



909 



p^ 



Night-flowering cdcti with slenderj "branched "stems, the branches fluted or angled each areole 

 with several acicular spines ; flowers borne singly at areoles near the ends of the branches, funnel, 

 form laree with a p ^' ^"--' ^-- *--i-- — i^^^/v^e fVi^^ Kmh nr lonfrer : nuns irlobose. ov^oid or obovoid. 



the scales subtendinj 



as the flower OVnnriMK fimt-r ii»-i i^^m n-.-^t-t'iin^iica xAxv^^w*T !-•*"- — n ' ' /• • 



tubercled; style somewhat longer than the stamens; fruit globose to obovoid-globose, spmeless or 

 spiny, but with mostly deciduous scales, the corolla withering-persistent; seeds numerous, small. 



:ufts of long or short hairs, persistent or sometimes 

 gments mostly pink or greenish, Hnear to lanced 



^'i 



that island. 



> is named 

 Jamaica, ( 



William 



We 



Antill 



Arg 



species, distributed from Florida and the Bahamas and the Greater 



The tvoe species is Cereus gracilis Miller 



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