916 CONTEIBUTIONS FROM THE NATIONAL HERBARIUM. 



8. Selenicereus murrillii Britt. & Rose, Cactaceae 2: 206. 1920. 

 Type from Colima. 



A slender vine 6 meters long or more, 8 mm. in diameter, dark green, the 

 ribs more or less purplish ; ribs 7 or 8, low, obtuse, separated by broad inter- 

 vals; areoles 1 to 2 cm. apart, small, bearing white wool and minute spines; 

 spines 5 or 6, the two lower ones reflexed, 1 to 2 cm. long, the others 

 conic, greenish to black; flower 15 cm. long, the tube and throat 6 cm. long, 

 bearing a few slightly elevated areoles, these white-felted and bearing 1 or 2 

 minute spines; outer perianth segments greenish yellow, linear to linear- 

 lanceolate, acute, the inner pure white, broadly spatulate, obtuse; ovary bear- 

 ing numerous rather large areoles, these white-felted and with 1 to 3 short 

 spines but no long hairs. 



9. Selenicereus spinulosus (DC.) Britt. & Rose, Contr. U. S. Nat. Herb. 



12: 431. 1909. 



Cereus spinulosus DC. M4m. Mus. Hist. Nat. 17: 117. 1828. 



Tamaulipas and elsewhere in eastern Mexico. Southern Texas. 



Stems clambering, 2 to 4 meters long, 1 to 2 cm. in diameter, producing 

 numerous aerial roots, light green, somewhat shining, usually angled but 

 sometimes nearly terete; ribs 4 to 6, or sometimes more; spines very short, 

 yellowish or becoming blackish ; radial spines 5 or 6, with 2 reflexed bristles 

 at base of the areole; central spine 1, rarely 2, on juvenile branches more 

 numerous and more acicular, white ; flower 12 to 14 cm. long ; tube about 5 cm. 

 long, with a few clusters of small spines; outer perianth segments narrowly 

 oblong, 5 to 6 cm. long, acute, spreading; inner perianth segments pinkish to 

 white, narrowly oblong, acute; ovary covered with clusters of spines similar 

 to those on the tube. 



23. DEAMIA Britt. & Rose, Cactaceae 2: 212. 1920. 



The genus consists of a single species. 

 1. Deamia testudo (Karw.) Britt. & Rose, Cactaceae 2: 213. 1920. 



Cereus testudo Karw.; Zucc. Abh. Akad. Wiss. Munchen 2: 682. 1837. 



Cereus pterogonus Lem. Cact. Hort. Monv. 59. 1839. 



Cereus pentapterus Otto; Salm-Dyck. Cact. Hort. Dyck. 1849. 221. 1850. 



Cereus miravallensU Weber, Bull. Mus. Hist. Nat. 8: 459. 1902. 



Veracruz and elsewhere in southern Mexico. Central America and Colombia. 



Stems and joints various, 3 to 10 cm. broad, or perhaps even more; ribs 

 thin, winglike, 1 to 3 cm. high; areoles 1 to 2 cm. apart or on juvenile 

 growth much closer; spines spreading, 10 or more, 1 to 2 cm. long, brownish; 

 flowers 28 cm. long, with a long slender tube 10 cm. long expanding into 

 a broad throat nearly as long as the tube; inner perianth segments linear- 

 oblong, acuminate, 8 to 10 cm. long; stamens numerous; style slender, 24 

 to 25 cm. long; stigma lobes linear, numei-ous ; scales on ovary 1 mm. long 

 or less; hairs on ovary and flower tube brown, 1 to 3 cm. long. 



DOUBTFUL SPECIES. 



Cekeus acanthosphaera Weing. Monatsschr. Kakteenk. 24: 81. 1914. Type 

 from Rfo de Santa Maria, Veracruz. Perhaps a species of Deamia. 



24. APOROC ACTUS Lem. lUustr. Hort. Lem. 7: Misc. 67. 1860. 



Slender vinelike cacti, creeping or clambering, sending out aerial roots freely, 

 day-blooming; flowers rather small, one at an areole, funnelform, pink to 

 red, the tube nearly straight, or bent just above the ovary, the limb some- 





