Plants clambering or climbing. Stems stout, light green, 2-3 cm (0.8-1.2 in) in diameter, tipped with white hairs. Ribs 8-10, undulating, with knobby tubercles bearing the areoles. Areoles bearing spines and brisdes. Spines 10-12, conical, stiff, 1-2 mm long, the inner ones thicker and often bent. Flowers white within, yellowish without, to 25 cm (9.8 in) long; pericarpels with long white hairs. Fruits not known. Distribution: Cuba.
Selenicereus chontalensis (Alexander) Kimnach 1991 Nyctocereus chontalensis Alexander 1950
Plants sprawling or pendent, lithophytic, branching at the nodes, rooting on undersurfaces, to 1 m (3.3 ft) or more long. Stems light yellow-green, often waxy, segments 10-40 cm (3.9-16 in) long, 4-5 cm (1.6-2 in) in diameter. Ribs 56, narrow, notched, winglike, often tinged reddish. Areoles slightly sunken. Spines yellowish, becoming darker with age, 5-10 mm (0.2-0.4 in) long. Central spines 1-4, somewhat
Selenicereus atropilosus, photograph by Urs Eggli stout. Radial spines 5-7, slender, flexible. Flowers funnel-form, very fragrant, somewhat bilaterally symmetrical, white, 6-8 cm (2.4-3.1 in) long; pericarpels distinctly tu-berculate, with delta-shaped scales and twisted hairs. Fruits globose, red, fragrant, 1-2 cm (0.4-0.8 in) in diameter. Distribution: pine and oak forests of Oaxaca, Mexico.
Selenicereus chrysocardium (Alexander) Kimnach 1991 Epiphyllum chrysocardium Alexander 1956, Mamiera chrysocardium (Alexander) Backeberg 1959
Plants epiphytic, with strongly ascending branches. Stems flattened, leaflike, to 30 cm (12 in) wide, upcurved and tapering apically, with deep lobes 13-15 cm (5.1-5.9 in) long and 4 cm (1.6 in) wide. Areoles in notchlike pits on upper sides of lobes, sometimes with two or three short bristles. Flowers long funnelform, white, with an odor of sour cream, to 32 cm (13 in) long and 20 cm (7.9 in) in diameter; pericarpels strongly tuberculate, with scales and bristles. Fruits spiny. Distribution: Chiapas, Mexico.
Selenicereus coniflorus (Weingart) Britton & Rose 1909
pitayita de culebra
Cereus coniflorus Weingart 1904 Selenicereus pringlel Rose 1909
Plants usually climbers. Stems with numerous aerial roots, pale green with purple tint along ribs. Ribs 5-6 with depressed or flattened faces, marginally wavy to knobby. Areoles bearing spines and bristles. Spines pale yellow, needlelike. Central spine one, erect, 1-1.5 cm (0.4-0.6 in) long. Radial spines 4-6. Flowers white within, orange to lemon yellow without, 22-25 cm (8.7-9.8 in) long; pericarpels and floral tubes with linear scales, white hairs, and spines. Fruits
Selenicereus hamatus 633
globose, 6 cm (2.4 in) in diameter. Distribution: along the Gulf coast in Veracruz, Mexico.
Selenicereus donkelaari (Salm-Dyck) Britton & Rose ex
L. H. Bailey 1909 choh-kan, sak-bak-el-kan Cereus donkelaari Salm-Dyck 1845
Plants creeping or ascending, to 8 m (26 ft) or more long. Stems slender, to 1 cm (0.4 in) in diameter. Ribs 9-10, obtuse, indistinct. Areoles closely spaced. Spines in clusters of 10-15. Central spines one to several, 1-2 mm long. Radial spines hairlike, flattened, 3-4 mm long. Flowers with long floral tubes, white, to 18 cm (7.1 in) long. Fruits not known. Distribution: Yucatán, Mexico.
Selenicereusgrandiflorus (Linnaeus) Britton 8c Rose 1909
queen ofthe night, reina de la noche
Cactus grandiflorus Linnaeus 1753, Cereus grandiflorus (Linnaeus) P. Miller 1768
Cereus knuthianus Otto ex Salm-Dyck 1850, Selenicereus knuthianus
(Otto ex Salm-Dyck) Britton & Rose 1909 Selenicereus hallensis Weingart ex Borg 1937
Plants clambering or climbing, to 5 m (16 ft) long. Stems 1.2-2.5 cm (0.5-1 in) in diameter. Ribs 5-8, low. Areoles not seated on knobs or spurs. Spines 6-18, bristle-like, whitish to brownish, later falling away, 4.5-15 mm (to 0.6 in) long. Flowers fragrant, white within, pale yellow to brownish and with narrow outer perianth parts without, to 30 cm (12 in) long. Fruits ovoid, 8 cm (3.1 in) long. Distribution: actual origin uncertain but now occurring in eastern Mexico and throughout the Caribbean. Selenicereus grandiflorus has long been cultivated. Its medicinal use is discussed in Chapter 2, under Cacti as Medicine. The relationship of S. grandiflorus to other species of Selenicereus is a matter of confusion.
Selenicereus hamatus (Scheidweiler) Britton 8c Rose 1909
queen ofthe night, reina de la noche Cereus hamatus Scheidweiler 1837
Plants clambering, to 4 m (13 ft) long. Stems three- or four-angled, to 1.5 cm (0.6 in) in diameter, with prominent spurs or hooked tubercles to 1 cm (0.4 in) long beneath the areoles. Spines few, short, weak. Flowers fragrant, yellowish white to white, 20-35 cm (7.9-12 in) long. Fruits not known. Distribution: Mexico along the Gulf of Mexico. Selenicereus hamatus is cultivated for use as a living fence (Chapter 2, under Other Uses of Cacti).
634 Selenicereus hondurensis
Selenicereus hondurensis (K. Schumann) Britton &Rose 1909
Plants clambering, trailing, or climbing. Stems elongated, to 2.2 cm (0.9 in) in diameter. Ribs 7-10, slightly indented. Areoles dark, with brownish hairs and bristles. Spines 7-10, bristle-like, white, not sharp, 4-5 mm long. Flowers creamy white, to 23 cm (9.1 in) long and 18 cm (7.1 in) in diameter. Fruits top shaped, dark rose, to 6 cm (2.4 in) long and 5.5 cm (2.2 in) in diameter. Distribution: Honduras and Guatemala.
Selenicereus inermis (Otto) Britton & Rose 1920 Cereus inermis Otto 1837 Epiphyllum steyermarkii Croizat 1974
Plants creeping or scrambling, lithophytic. Stems glossy light green, 1-2.5 cm (0.4-1 in) in diameter. Ribs 3-5, acute, straight or slightly wavy. Areoles borne on elevations or knobs, to 6 cm (2.4 in) apart, spineless. Flowers white, 15 cm (5.9 in) long; pericarpels and floral tubes usually without spines or hairs. Fruits not known. Distribution: Venezuela and Colombia.
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