Nathaniel Britton and Joseph Rose described Weberocereus in 1909. At approximately the same time, Britton and Rose described two other genera, Eccremocactus and Werckleo-cereus, for other epiphytic cacti of Central America and northern South America. The International Cactaceae Sys-tematics Group has included Eccremocactus and Werckleo-cereus in Weberocereus, with nine species.

The name Weberocereus (type, Cereus tunilla = W. tunilla) honors Frédéric Albert Constant Weber, who contributed greatly to the study of cacti in the late nineteenth century. Britton and Rose (1919-1923,2:214-216,4:204) placed Weberocereus and Werckleocereus in their subtribe Hylocere-

Weberocereus Eccremocactus Bradei
Weberbauerocereus weberbaueri

Weberocereus imitans 679

anae, and Eccremocactus in subtribe Epiphyllanae. Subsequent research has shown that the broadly defined Weberocereus is, in fact, in the tribe Hylocereeae. Weberocereus is generally characterized as epiphytic or lithophytic shrubs with variously shaped stems. Flowers open at night, are short funnelform to bell shaped, and have tuberculate pericarpels and floral tubes bearing bristles or hairlike spines.

Weberocereus Britton & Rose 1909 Werckleocereus Britton & Rose 1909 Eccremocactus Britton & Rose 1913

Subfamily Cactoideae, tribe Hylocereeae. Plants epiphytic or lithophytic, arching or climbing shrubs. Roots often adventitious. Stem segments round in cross section, angled, orflattened. Ribs 2-5 with lobed or toothed margins. Areoles small, weakly spiny. Spines short, bristly, sometimes absent. Flowers borne laterally on the stems, open at night in summer, bell shaped to short funnelform, pink to yellow-white to green tinged, 3-10 cm (1.2-3.9 in) long; areoles of pericarpels and floral tubes with bristles or hairy spines; staminal throat circle present. Fruits globose to oblong, fleshy, often tuberculate, red or yellow, with white or purple pulp, bristly or naked. Distribution: southern Mexico south through Central America into Ecuador with the greatest concentration of species in Costa Rica.

Weberocereus biolleyi (F. A. C. Weber) Britton 8c Rose 1909 Rhipsalis biolleyi F. A. C. Weber 1902, Cereus biolleyi (F. A. C. Weber) F. A. C. Weber 1903

Plants epiphytic, much branched, trailing or climbing shrubs. Stems very long and slender, pendent, rounded or bluntly angular, brownish red, to 80 cm (31 in) long, 7-15 mm (0.30.6 in) in diameter. Areoles small, wide apart. Spines usually absent, rarely 1-3, fine. Flowers bell shaped, yellowish green to reddish brown on the outside, pale pink within; perianth parts fleshy, pericarpels with white spines. Fruits subglobose, rose to pink, odorless, to 2.5 cm (1 in) long and 2.2 cm (0.9 in) in diameter. Distribution: Nicaragua and Costa Rica.

Weberocereus bradei (Britton 8c Rose) G. D. Rowley 1974 Eccremocactus bradei Britton & Rose 1913, Phyllocactus bradei (Britton & Rose) Vaupel 1913

Plants epiphytic, ascending at first, then horizontal or pendent, branching basally or near tips. Stems round in cross section basally, then flattened, thick, leaflike, 60-100 cm (2439 in) long, 5-12 cm (2-4.7 in) wide, slightly wavy margins, sinuses to 5 mm deep, rounded apically. Areoles borne at bases of sinuses, wool absent. Spines 2-4, sometimes more, amber colored, needle-like, swollen basally, 3-6 mm (to 0.2 in) long. Flowers borne on the apical portion of stems, singly or in clusters, bell shaped to funnelform, cream to white, 5.5-

7 cm (2.2-2.8 in) long; fleshy perianth segments sometimes only slightly expanding. Fruits oblong to ovoid, smooth, brownish red, 3.5 cm (1.4 in) long. Distribution: Costa Rica.

Weberocereus glaber (Eichlam) G. D. Rowley 1982 Cereus gteber Eichlam 1910, Werckleocereus glaber (E\ch\am) Britton & Rose 1917

Seienicereus mirandae Bravo 1967, Werckleocereus glabervar. miran-dae (Bravo) Kimnach 1978, Weberocereus glaber var.mirandae (Bravo) Eliasson 1986

Plants climbing, lying flat on the ground, or pendent, with lateral branching. Roots copious, aerial. Stems more or less rounded basally, then three-angled above, light green, flat to slighdy concave between the ribs, 2-3 m (6.6-9.8 ft) long, 1.5-4.5 cm (0.6-1.8 in) wide. Areoles with black wool, becoming white. Spines 0-5, cream to brown, 1-3 mm long. Flowers borne apically or subapically, solitary, funnelform, cream colored, 9-14 cm (3.5-5.5 in) long; pericarpels with brownish black wool, many twisted hairs, and as many as 12 straight sharp spines to 1 cm (0.4 in) long. Fruits globose, dull light yellow, fragrant, to 7 cm (2.8 in) long, with many spines and hairs. Distribution: southern Mexico and Guatemala.

Two varieties of Weberocereus glaber are recognized. Variety glaber has flowers 9-10 cm (3.5-3.9 in) long with rather sparse hairs; it occurs in Guatemala. Variety mirandae has flowers 12-14 cm (4.7-5.5 in) long with many hairs; it occurs in Mexico.

Weberocereus imitans (Kimnach & Hutchison) Buxbaum 1978

Werckleocereus imitans Kimnach & Hutchison 1956, Eccremocactus imitans (Kimnach & Hutchison) Kimnach 1962, Cryptocereus imitans (Kimnach & Hutchison) Backeberg 1959

Plants epiphytic, ascending at first, then often lying more or less flat or pendent, much branched. Roots copious, aerial. Primary stems to 90 cm (35 in) long. Secondary stems arising at 45° angle from primary stems, rounded basally, then flattened, grass green, deeply lobed, the sinuses between the lobes 10-15 cm (3.9-5.9 in) wide. Areoles at bottom of sinuses, with white wool, subtended by small scales. Spines usually absent, sometimes 1-3, straight, needle-like, 2-4 mm long. Flowers borne on the apical portion of the stems, often bent sharply upward just above the pericarpels on pendent stems, nearly straight if on ascending stems, bell shaped to funnelform, light cream colored, 6-7 cm (2.4-2.8 in) long; pericarpels with wool and a few spines. Fruits oblong to ovoid, bronze-green, becoming red, to 3.7 cm (1.5 in) long. Distribution: southwestern Costa Rica.

680 Weberocereus panamensis

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