

REVISION OF THE GENUS CEREUS MILL. 75 





XIV. EUCEREUS Engelra. Syn. of the Cact. of the 



Terr, of the U. S. etc., Proc. Am. Acad. 3. (1856); 

 Coll. Works. 139; Cact. Bound. 40. 



* 



Ovary and tube with numerous small deltoid acute scales, those of the 

 tube larger and remote; from the axils of all of them rise hairs, wool and 

 setulose, more or less stiff Dristles; tube funnel-shaped, rather slender; 

 perianth leaves numerous. Fruit more or less roundish and reddish, 

 covered with spines often in deciduous clusters. — Plate 11; plate 12, 



The numerous species falling under Eiicereus easily group 

 themselves in a few natural subsections, which are given 



below : 



Subsection I. Nyctocereus A. Berg. 



Stems more or less upright, cylindrical, ribbed. Flowers nocturnal. 



The following species seem to belong here : 



Cerens (Nyctocereus) bavosas Web. 1. c. 84. — Mexico. 

 C. {Nyctocereus ?) candelabrum Web. 1. c. 106. — Mexico. (Descrip- 

 tion too poor.) 

 C. (Nyctocereus) Cumengei Web. 1. c. 85. — Baja California. 

 C. (Nyctocereus) Eruca Brandg. 1. c. 125c — Baja California. 

 C. (Nyctocereus) gummosus Eugelm. 1. c. 124. — Baja California. 

 C. (Nyctocereus) Ilirschtianus K. Sch. 1. c. 130. — Nicaragua. 

 C. (Nyctocereus ?) multangularis Haw. 1. c. 66. — Peru ? 

 C. (Nyctocereus) nesioticus K. Sch. 1. c. Nachtr. 37. — Galapagos 



Islands. 

 C. (Nyctocereus) Neumanni K. Sch. 1. c. Nachtr. 37. — Nicaragua. 

 C. (Nyctocereus) queretaroensis Web. 1. c. 83. — Mexico. 

 C. (Nyctocereus) serpentina P. DC. 1. c. 129. — Mexico. 



C ereus serpentinus P. DC. possesses the largest seeds of 

 G ereus known to me. There are only a few in each fruit, 

 bedded in the crystalline red pulp. Several varieties of 

 this species occur in gardens. There are two very pro- 

 nounced forms at La Mortola. One has weaker and more 

 serpentine stems, with smaller spines and smaller flowers. 

 This never produces any fruit. The other form has 

 stronger, upright stems with longer spines. Its flowers 







