Stems 1 to 2 cm. broad, strongly 3-angled or some joints flat; margins acute, indented; areoles small, each hidden beneath a small thick scale, sometimes bearing 1 to 3 short weak spines; flower 4 to 7 cm. long; outer perianth-segments and inner scales yellowish green, erect; inner perianth-segments white, oblong; tube proper smooth and white within; throat 1 cm. long; stamens included; filaments white, a part attached to the lower face of the throat and a part to the upper margin; style white, included; stigma-lobes white (in wild state said to be purple); ovary tuberculate, green, with spreading scales, each subtending 4 to 8 long white hairs; fruit red, 2 to 3 cm. in diameter, tubercled, at least when young.
Collected in forest thickets along the Rio Fato, Province of Colon, Panama, July 1911, by H. Pittier (No. 3903) and flowered first in Washington in 1913.
Plate xxxviii, figure 3, is from the type specimen, which flowered in the New York Botanical Garden, September 20, 1915. Figure 295 shows a fruiting branch collected by Mrs. D. D. Gaillard at Lake Gatun, Panama, in 1913.
PUBLISHED SPECIES, KNOWN TO US ONLY FROM DESCRIPTION.
Cereus estrellensis Weber (Monatsschr. Kakteenk. 15: 167. 1905) is, according to C. Werckle, similar to Cereus nycticallus but weaker and more spiny. The stems are 6-angled; the flowers are small, rosy to salmon-colored, and nocturnal. It is of Costa Rican origin, but is known to us only from this brief characterization and may belong to our genus Weberocereus.
7. WERCKLEOCEREUS Britton and Rose, Contr. U. S. Nat. Herb. 12: 432. 1909.
Epiphytic, climbing cacti, the 3-angled branches emitting aerial roots, their areoles bearing short bristles or very weak spines and a tuft of felt; flowers short-funnelform, the tube rather stout; ovary and flower-tube bearing many areoles, each with several nearly black, acicular spines and a tuft of short black felt, subtended by minute scales; outer perianth-segments lanceolate, acutish, narrow; inner perianth-segments broader; stamens many; style about as long as the longer stamens, with several linear stigma-lobes; berry globose, its areoles spiny.
Two species are known, 1 in Costa Rica and 1 in Guatemala; both are in cultivation. The genus is dedicated to C. Werckle, a Costa Rican collector.
Type species: Cereus tonduzii Weber.
In habit the plants resemble species of Hylocereus, but the flowers are very different.
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