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Updated 17 October 2000

Selenicereus  boeckmannii

Synonymy
Cereus boeckmannii Otto in Salm-Dyck (1850) Cact. Hort. Dyck. 217
Cereus eriophorus Gisebach (1866) Cat. Pl. Cub. 116 non Link & Otto
Cereus ophites Lemaire Monatsschr. Kakteenk. (1894) 4:173
Selenicereus boeckmannii (Otto) Britton & Rose (1909) Contr. U. S. Nat. Herb. 12:429
Cereus vaupelii Weingart (1913) Monatsschr. Kakteenk. 22:106
Selenicereus vaupelii (Weingart) A. Berger (1929) Kakteen 114, 346
Selenicereus grandiflorus v. ophites (Lemaire) Borg (1951) 206

Ethymology
Salm-Dyck gives no clue to origin of the name, but someone named Böckmann would probably  had been involved in its introduction.

History
This species was originally described from cultivated material and was later found growing wild.

Description
Stems
scandent, clambering or sprawling, branching, producing aerial roots, stiff, to 10 m long or more, 1-2 cm thick; ribs 3-8, well marked, rounded, almost terete in age, slightly if all undulate to undulate; areoles 1 mm, with brown or greyish wool, aging white, internodes 13-17 mm, young areoles with short purple hairs; spines conical, radial spines 3-4, 1-2 mm long, conical, stiff, central spine 1, to 2 mm long, stiffer than radials, at first purplish, bristles from lower part of areole, numerous, white, depressed; epidermis light green, smooth.
Flowers produced from year-old areoles or older, 24-39 cm long, 20 cm in diameter, nocturnal, reported as both scentless and scented of vanilla or easter lilies, outer tepals spreading, inner tepals forming a broad cup, 12 cm in diameter, exceeding the stamens. Pericarpel elliptical, strongly tuberculate, 2 cm long, covered with long brownish, silky hairs and bristles, bracteoles 2 mm long, purple, linear, acute. Receptacle 14 cm long, 2cm thick at base, swollen above, 5 cm thick. Outer tepals linear, brownish to brownish green on the outside, yellowish on the inside, sometimes with red tip, the innermost yellow throughout, darker on outside. Inner tepals oblanceolate to lanceolate, widest near apex, abruptly terminated in a short-acuiminate point, 10 cm long, 3 cm broad at widest, pure white. Stamens greenish, slender and weak. Style greensih, 4 mm thick, lobes many, pale yellow, as long as inner tepals.
Fruit globular, 5-6 cm in diamter, knubby with brown hairs, reddish yellow.

Illustration from Britton & Rose ((1920)

Origin and habitat
Greater Antilles (Cuba, Cayman Islands, Hispaniola), also reported from E Mexico (the Golf coast and Tamapulipas). Dense rocky woodlands, lithophytic or epiphytic.

Systematics
A species in the S. grandiflorus-complex. Similar to S. pteranthus but stems more slender andless glaucous and brown floral hairs (rather than white).

Cultivation
An easily cultivated, fast growing epiphyte. Needs a compost containing plenty of humus and sufficient moisture in summer. Should not be kept under 10ºC (50ºF) in winter. Can be grown in semi-shade or full sun. Extra light in the early spring will stuimulate budding. Flowers in late spring or early summer..

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