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MONVai^EA. 21 



The following names of Cereus we have been unable to refer to any of the species 

 otherwise mentioned in this work : 



Cereus aculeatus Forster, Handb. Cact. 433. 1846. 



albertinii Fobe, Monatsschr. Kakteenk. 18: 175, 1908. 



atrovirens Forster, Handb. Cact. 433. 1846. 



'concinnus Haage in Schumann, Gesamtb. Kaktcen 167. 1897. 



damacaro Haage in Schumann, Gesamtb. Kaktcen 167. 1S97. 



incrassatus Link and Otto, Verh. Ver. Beford. Gartenb. 6: 432. 1830. 



jacquinii Rebut in Schumann, Gesamtb. Kaktcen 167. 1897. 



karwinskii Haage in Schumann, Gesamtb. Kaktcen 167. 1897. 



longipendunculatus Forster, Handb. Cact. 433. 1846. 



lormala Maass, Monatsschr. Kakteenk. 15: 119. 1905. 



ophites Lemaire, Monatsschr. Kakteenk. 4: 173. 1894. 



pruinalus, Monatsschr. Kakteenk. 11: 181. 190 1. 



robustus Schumann, Monatsschr. Kakteenk. 13: in. 1903. 



rogalli Schumann, Monatsschr. Kakteenk. 9: 96. 1899. 



5a//>m^gw<rw Schumann, Monatsschr. Kakteenk. 11: 181. 1901. 

 schoenemannii Hildmann, Monatsschr. Kakteenk. 5:43. 1895./ 

 spathulatus Forster, Handb. Cact. 433. 1846. 



.s/ec^wanrnV Jacobi, Monatsschr. Kakteenk. 5 : 43. 1895. /' 



tellii, Monatsschr. Kakteenk. 5: 43. 1895. A name from Hildmann's Catalogue. 



trichocentrus Forster, Handlj.. Cact. 433. 1846. 



verschaffeUii Haage in Schumann, Gesamtb. Kakteen 167. 1897. 



<^ f/0^ 2. MONVILLEA gen. nov. 



^ Night-blooming cacti with long, slender, half -erect steins, often forming thickets; flowers borne 

 toward the top of the stem, of medium size, without felt or spines ; tube proper in typical species 

 slender, tapering into a short throat; scales minute; outer perianth-segments greenish or pinkish; 

 inner perianth-segments white or yellow; stamens white, not in definite rows but scattered over 

 the throat; style slender, white, with linear stigma-lobes; flower-tube rigid after anthesis, withering 

 on the ovary; scales on the ovary minute, their axils naked; fruit glabrous, red, plump, spineless; 

 flesh of fruit white, juicy; seeds small, black. 



' ■ ■ ■ 



Type species : Cereus cavendishii Monville, 



The generic name commemorates M. Monville, a well-known student of this family. 

 We recognize 7 species, all South American. 



Key to Species. 



Flower- tube slender, straight; stamens and style more or less exserted. 

 Ribs 6 to ID. 



Flowers white \. M. cavendishii 



Flowers yellow 2. Jl/. insularis 



Ribs 3 to 5. . 



Plants erect, bluish green, more or less spotted; branches with 3 or 4 sharp ribs, these 



deeply serrate 3. M. spegazzinii 



Plants decumbent; branches with 4 or 5 rounded ribs 4, M. phatnosperma 



Flower-tube short and stout, somewhat curved; stamens and style included. 

 " Spines subulate, often elongated. 



Fruit globular; flower strongly angled; flower-bud pointed 5. M. diffusa 



Fruit oblong; flower not strongly angled; flower-bud obtuse (5. M, maritima 



Spines acicular, all very short 7. -W. amazonica 



1. Monvillea cavendishii (Monville). 



Cereus serpentinus splendens Salm-Dyck in Lemaire, Cact. Gen. Nov. Sp. 79. 1839. 



Cereus cavendishii Monville, Hort. Univ. i: 219- 1840. 



Cereus paxtonianus Monville in Salm-Dyck, Cact. Hort. Dyck. 1849. 211. 1850. 



Cereus splendens Salm-Dyck, Cact. Hort. Dyck. 1849. 214. 1850. 



Cereus saxicola Morong, Annals N. Y. Acad. Sci. 7: 121. 1893. 



Cereus euchlorus Weber in Schumann, Gesamtb. Kakteen 84. 1897. 



Cereus rhodoleucanthus Schumann, Monatsschr. Kakteenk. 9: 187. 1899. 



Eriocereus cavendishii Riccobono, Boll. R. Ort. Bot. Palermo 8: 239. 1909. 



In cultivation more or less branched at base, i to 3 meters high, suberect or clambering, green, 

 2 to 3 cm. in diameter; ribs 9 or 10, low and rounded; areoles small, about i cm. apart; spines acicular, 



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