ADDISONIA 13 
(Plate 47) 
WERCKLEOCEREUS GLABER 
Glabrate Werckleocereus 
Native of Guatemala 
Family CACTACEAE Cactus Family 
Cereus glaber Kichlam, Pramas Kakteenk, 20: 150. 1910. 
Werckleocereus glaber Britton & Ros 
i sion se sisi clambering or climbing by aerial 
ene The e pale et slightly glaucous, slender, three 
angled, the Bae ee oe inch broad. ‘The small “axetles 
are about an inch apart, each re sare a small dae of spines, 
There are three or four spines in a cluster, very short, needle-like, 
but with bulbose bases. ‘The flowers, which open only at night, are 
Hare nearly four inches cues and fully as broad. ‘The outer peri- 
nth-segments are narrowly oblong, yellowish white, ee: or 
echt The pure white inner perian eseneat s are oblan 
late, acute, and somewhat serrate. The stamens are long dae 
slender. ‘The long pale yellow style is aay and reclines on the 
lower part of the flower. The stigma-lobes are white. The ovary 
and tube of the flower bear clusters of yellow acicular spines. 
he specimens were obtained in 1911 through Dr. Rose from wild 
plants collected in Guatemala by F. Hichlam, and flowered in the 
New York Botanical Garden May 4, 1915. 
This species was first described as a Cereus, but in its habit, 
flowers and fruit it is very unlike the true species of Cereus, of which 
the well-known greenhouse species, Cereus Jamacaru, is a good 
representative. 
Werckleocereus glaber is a near relative of W. Tonduzii, which in 
1909 Britton and Rose made the type of a new genus. This latter, a 
Costa Rican plant, has also previously been known as a species of 
ereUus. 
Werckleocereus in its habit and stems resembles Hylocereus, but 
possesses very different flowers and fruits. In Hylocereus the ovary 
and fruit is covered with large foliaceous scales without spines or 
bristles in their axils. Weberocereus is another related genus bearing 
similar scales on the ovary, but only hairs are found in the axils; 
then, too, the ovary is not tuberculate and the fruit is not spiny. 
J. N. Ross. 
