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Updated 8 October 2000

Selenicereus nelsonii

Synonymy
Cereus nelsonii Weingart (1923) Zeitschr. Sukkulentenkde. 1:22-37
Selenicereus nelsonii Britton & Rose (1923) The Cactac. 2:212

Ethymology
This species commemorates C. Z. Nelson from Galesburg, Illinois, who first collected this species in the south of Mexico in 1914. He was not sure of the exact locality and still today the origin of this species is not exactly known.

History
This has always been an anonymous species and possibly not reintroduced since this original collection. Rarely grown under it this name.

Photograph by Malcolm Pym

Description
Stems
scandent, clambering or sprawling, branching, producing aerial roots, stiff, to 3 m long, 10-15(-20) mm thick; ribs 6-7, narrow, acute; areoles on small tubercles, round with whitish wool, internodes 10-20 mm; spines to 5-7(-10) mm long, acicular, radiating, white or pale yellow, radial spines (8-)10-11, paler, central spines 1-2(-4), longer and thicker, bristels from lower part of areole 2-3, 5 mm long, white; epidermis green or pale green, margins often purplish, shiny
Flowers 20-25 cm, produced near top of stems, nocturnal, markedly fragrant; pericarpel ovoid with many white areoles, short bracteoles, hairy and with long, softish white or yellow spines; receptacle ca 12cm long, brtaceoles purplish, with hairs and bristles; outer tepals linear, greenish white, the outermost reddish brown; inner tepals 10 cm long, 12-15 mm wide, lanceolate, acuminate, white; stamens white, slightly exceeding the stamens; style white, exceeding the stamens.
Fruit globular, red, 25 mm in diameter with white spines, 10 mm long.

Origin and habitat
S Mexico: exact locality not known.

Systematics
This species is closely related and maybe conspecific with S. vagans.

Cultivation
A fast growing species of easy cultivation which needs a compost containing plenty of humus and regular watering in summer. Minimum temperature 10ºC (50º) in winter, then kept totally dry, will not flower if the temperature is constantly high. Full sun or partly shaded.

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