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BORZICACTUS. 



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159 



CerEus areolatus Miihlcnpfordt in Schumann, Gesamtb. Kakteen 100. f. 20. 1897. 



Cleislocactus areolaius Riccobono, Bol. R. Ort. Bot. Palermo 8: 264. 1909. 



Described as columnar, somewhat branching, with 12 low, acutish ribs; ribs divided into 

 tubercles by transverse lines running down from the areolcs; radial spines 9 or 10, acicular; central 

 spines 2 to 4, stouter, subulate : flowers and fruit unknown. 



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name 



as Cereus dumesnilianus lyabouret in Gruson's Catalogue. / ' 



This cactus is described from plants which are supposed to have come from the Andes 

 of South America. The species is recognized by Schumann in his monograph and is placed 

 in his series Graciles after Cereus platygonusJ It has been in cultivation in the Berlin Botan- 



1914. 



La Mortola. . From 

 may be described as 



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Ribs 15, low, rounded, with a deep horizontal groove just above the areolcs; spines yellowish 

 brown, the 6 to 8 radials acicular, spreading, about i cm. long; the central subulate, 2 cm. long, 

 porrect. . . 



Cereus magnus Haworth, Phil. Mag. 7: 109. 1830. 



This species has not been definitely identified. Haworth says it was procured from the captain 

 of a French vessel, who obtained it from Santo Domingo. He describes it as a yard high, with 12 

 ribs and a very large white flower 6 inches long and open day or night. This does not correspond 

 to any cactus known from Hispaniola. - Pfeiff'er suggests that it might be a form of C eyricsH, that 

 is an Echinopsis. ' In its large flower, open both day and night, it does agree with that genus. 



Cereus microsphacricus Schumann (Fl. Bras. 4^: 196. 1890) and C. damazioi Schumann 

 (Monatsschr. Kakteenk. 13: 63. 1903; 28: 62. 1918) are of this alliance. Both come from 

 near Rio de Janeiro, Brazil' i . ',.1 



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27. BORZICACTUS Riccobono, Boll. R. Ort. Bot. Palermo 8: 261. 1909 



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Low, slender cacti, erect or procumbent; ribs usually numerous but sometimes as few^ as 9, 

 usually low and rounded; spines acicular or in some species subulate; areoles usually approximate, 

 in some species producing wool with the flowers; flowers diurnal, orange to scarlet (in one species 

 said to be white) solitary, narrow; tube-proper very short, smooth within; throat very narrow below, 

 expanded above; limb somewhat spreading; axils of scales on ovary and flower-tube bearing long 

 silky hairs; stamens long and slender, slightly exserted; fruit small, globular, edible. 



Type species: Borzicactus ventimigliae Riccobono. 



This genus is perhaps nearest Rathbunia of Mexico, but is of different ha 

 with different spines. The flowers are of much the same shape, but with a 

 some of the stamens originating near the base of the flower-tube, while the 



Ovary and flower bear long silky hairs. 



The Dlants are found in the mountains and hills of Ecuador, Peru, and r 



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remarkable development 



The indications are that there are still other 



species to be referred here. 



named 



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Palermo 



Eight 



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Key to Species. 



Flowers red. 



Base of throat bearing a mass of hairs within. ^^ . 



Ribs few. 8 to XX, prominent ! ! ! ! ! ! ! ! ! ! •. ! li m&«. 



Ribs many, low "^ 



Base of throat naked within. ... , . • . n :^^^nn^^,.f 



Flowers pinkish, not as narrow as in the next specxes, their areoles very hairy i- B. icosa^onus 



Flowers dark red. very narrow, their areoles not very hairy. 4- g- ^^"J*^^^^; 



Flowers white >5. ^; ,,uMdtii 



7. 5. plagiosloma 



8. B. aurivillus 



Not grouped 



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