434 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Heliocereus schrankii (Zucc. ). 
Cereus schrankii Zace.; Seitz, Allg. Gartenz. 2: 244. 1834. 
TYPE LocaALiry: Mexico. 
Distripution: Mexico. 
ILLusTRATION: Pfeiff. & Otto, Abb. u. Beschr. 2: pl. 27. 
Heliocereus speciosus (Cav. ). 
Cactus speciosus Cay. Anal. Cienc. Nat. Madrid 6: 339. 1803. 
Cactus speciosissimus Desf. Mem, Mus. Paris 3: 193. 1817. 
Cereus bifrons Haw. Suppl. Pl. Suce. 76. 1819. 
Cereus speciosissimus DC. Prod. 3: 468. 1828. 
Cereus speciosus Schum. in Pflanzenfam. 3°: 179. 1894. 
TypPe LocaLity: Mexico. 
DisrripuTion: Mexico. : 
IuLustrations: Colla, Hort. Ripul. pl. 10; Mem. Mus. Paris loc. cit. pl. 9, Bot. 
Reg. 6: pl. 486; Bot. Mag. 49: pl. 2306; Herb. Amat. pl. 891; Bot. Cab. pl. 924; 
Reichenb. Fl. Exot. pl. 780; Schum. Gesamtb. Kakteen f. 36. 
20. WILCOXIA gen. nov. 
Stems usually low and weak from a cluster of fleshy roots, slender, more or less 
branched, the branches often only 1 cm. or less in diameter; ribs few and low; 
spines of all the areoles similar; flowers diurnal, large for the size of the plant, only 
one from an areole; tube rather short, its areoles bearing spines and wool]; ovary and 
fruit with spines at the areoles; seeds black, the aril large, basal. 
Two species from the United States and Mexico. 
Type species Cereus poselyeri (Lem.) Coult. 
The type species has been included in Echinocereus, but its habit is very unlike 
that of any species of that genus. The second species has been considered an 
anomalus Cereus. The two seem to form a well defined group and are therefore 
brought together under the above generic name. 
The genus is named for Brig. Gen. Timothy EK. Wileox, U. 8S. A., retired, who 
has been an enthusiastic student of plants for many years. 
Wilcoxia poselgeri (Lem.). 
Echinocereus poselgert Lem. Cact. 57. 1868. 
Echinocereus tuberosus Rimpl; Forst. Handb, Cact. ed. 2. 783. 1886. 
Cereus tuberosus Poselg. Allg. Gartenz. 21: 135. 18538, not Pfeiff. knum. Cact. 1837. 
Cereus poselgerit Coult. Centr. Nat. Herb. 3: 398. 1896. 
Type Loca.iry: Not given. 
Distripution: Southern Texas and Coahuila. 
ILLustRAtTIons: Engelm. Cact. Mex. Bound. pl. 59. f. 12; Bliuhende Kakteen p/. 38, 
Wilcoxia striata (Brandegee). 
Cereus striatus Brandegee, Zoe 2: 19. 1891. 
Cereus diguetti Weber, Bull. Mus. Hist. Nat. 1: 318. 1895. 
Typr Locatity: ‘‘San José del Cabo,’’ Lower California. 
DisrrisutTion: Lower California and Sonora. 
21. APOROCACTUS Lem. Ill. Hortic. 7: misc. 67. 1860. 
Plants slender, vine-like creeping or clambering, sending out aerial roots freely; 
flowers rather small, one from an areole, slender, irregular, bright red, bent above 
the ovary; filaments inserted near the base of the tube, somewhat exserted; fruit 
globose, small, reddish, setose; seeds few, reddish brown, obovate. 
Type species Cactus flagelliformis 1. 
Aporocactus was considered a subgenus of Cereus by A. Berger under this name. 
