MONVILLEA. 21 



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

 otherwise mentioned in this work : 



Ccrcus ac nlcatiis Forster, Handb. Cact. 433. 1846. 



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



atrovirens Forster, Handb. Cact. 433. 1846. 



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



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



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



jacquiiiii Rebut in Schumann, Gesamtb. Kakteen 167. 1897. 



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



longipendunculatus Forster, Handb. Cact. 433. 1846. 



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



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



pruinatiis, Monatsschr. Kakteenk. n: 181. 1901. 



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



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



salpiitgcnsis Schumann, Monatsschr. Kakteenk. n: 181. 1901. 



schoencmannii Hildmann, Monatsschr. Kakteenk. 5:43. 1895. 



spatliulatus Forster, Handb. Cact. 433. 1846. 



steckmannii Jacobi, Monatsschr. Kakteenk. 5: 43. 1895. 



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



trichocentrus Forster, Handb. Cact. 433. 1846. 



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



2. MONVILLEA gen. nov. 



Night-blooming cacti with long, slender, half -erect stems, 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 10. 



Flowers white i. M. cavendishii 



Flowers, yellow 2. M. 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. d iff lisa 



Fruit oblong; flower not strongly angled; flower-bud obtuse 6. M. maritima 



Spines acicular, all very short 7. M. amazonica 



1. Monvillea cavendishii (Monville). 



Cereus serpent in us 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 euclilorns 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, 



