MONVIIXRA. 



23 



Plate in, figure 3, shows a flowering branch in the collection of the New York Botanical 

 Garden; figure 4 shows the fruit from a plant in the same collection. Figure 20 is from a 

 photograph taken in 19 17 by Dr. Shafer at Catilegua, Argentina. 



2. Monvillea insularis (Hemsley). 



Cereus insularis Hemsley, Voyage of Challenger Bot. I 2 : 16. 1884. 



Creeping or clambering, forming a dense thicket, much branched; branches nearly cylindric, 

 2.5 to 3 cm. in diameter, 6-angled; spines 12 to 15, unequal, spreading, terete, yellow; flowers de- 

 scribed as yellow, 12.5 cm. long; ovary and flower-tube bearing only a few minute scales, but no 

 spines or hairs; flower-tube very slender; perianth-segments in several series; filaments and style 

 protruding; stigma-lobes 13, radiating. 



Type locality: St. Michael's Mount, off Brazil, 5 S. latitude. 



Distribution: Known only from the type locality. 



This plant is noteworthy as inhabiting an island on which no other cactus exists. It 

 is the most eastern in natural distribution of all cactus species. So far as we are informed, 

 it has never been in cultivation. 



Illustration: Voyage of Challenger Bot. i 2 :pl. 14, as Cereus insularis. 



Figure 21 is copied from the plate above cited. 



3. Monvillea spegazzinii (Weber). 



Cereus spegazzinii Weber, Monatsschr. 



Kaktcenk. 9: 102. 1899. 

 Cereus anisitsii Schumann, Monatsschr. 



Kakteenk. 9: 185. 1899. 



Erect, strongly 3-angled or ribbed, 

 bluish green, more or less spotted with 

 white; ribs strongly undulate or serrate; 

 spines on young branches brown to black, 

 3 at an areole, 5 mm. long, with broad 

 conic bases ; on old wood 6 at an areole, of 

 these 5 radial, 1 central; bud and flower 

 rigid and erect, but after anthesis abruptly 

 reflexed ; flowers n to 12 cm. long, narrow, 

 funnelform ; outer perianth-segments pur- 

 plish, the inner nearly white, serrate 

 above, acuminate. 



Type locality: Near Resistencia, 

 Chaco Territory, Argentina. 



Distribution : Paraguay and north- 

 eastern Argentina. 



Cereus marmoratus Zeissold (Cat. 

 1899), unpublished, is referred by 

 Giirke (Monatsschr. Kakteenk. 18: 

 131. 1908) to Cereus anisitsii; Giirke 

 (Monatsschr. Kakteenk. 16: 146. 

 1906) also refers Cereus lindenzweig- 

 ianus, name only, to C. anisitsii. 



Illustrations: Monatsschr. Kak- 



FlG. 22. — Monvillea spegazzinii. 



teenk. 12: 193; Schumann, Gesamtb. Kakteen Nachtr. f. 5; Schelle, Handb. Kakteenk. f. 

 31; Rev. Hort. Beige 40: after 184*, as Cereus spegazzinii; Bliihende Kakteen 2: pi. 107, 

 as Cereus anisitsii. 



Figure 22 is from a photograph of the type specimen given to Dr. Rose by Dr. Spegazzini. 



*In the Revue de L'Horticulteur for 1914 was published a number of plates, mostly of cacti grown by Frantz 

 de Laet. These plates are not numbered and we have indicated their position by the page they follow. Most of 

 them were reproduced in De Lact's Catalogue General. 



