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Updated 8 October 2000

Selenicereus  macdonaldiae

Synonymy
Cereus macdonaldiae Hooker (1850) Curtis Bot. Mag. 79: pl. 4704
Cereus donatii K. Schumann (1903) Monat. Kakteenk. 13:185
Cereus grusonianus Weingart (1905) Monat. Kakteenk. 15:54
Cereus rothii (1922) Monat. 32:146
Selenicereus grusonianus (Weingart) A. Berger (1929) Kakteen 116, 346
Selenicereus rothii (Weingart) A. Berger (1929) Kakteen 116, 346
Selenicereus macdonaldiae v. grusonianus (Weingart) Backeberg (1959) 2:788

Ethymology
Hooker dedicated this species to Mrs. MacDonald who cared for this plant in the Royal Botanical Garden at Kew in 1850.

History
The origin of this plant is still unknown. It was belived to had come from Honduras or Argentina/Uruguay but has still not been rediscovered in wild state. The South American records are probably due to confusion with some species of Harrisia.

Photograph from Rainbow Gardens

Origin and habitat
Unknown, but maybe Honduras.

Systematics
S. macdonaldiae is a species which is easily recognized, even though close to the S. grandiflorus-komplex. The stems are quite distinct and the flower open more wide than most species.  S. kunthianus probably refers here, but the name are older and determatination could not be sure as no type material seems to exist. The plant described by Britton & Rose and still grown in Europe under this name does not fit the original description.
Selenicereus hallensis is probably a hybrid with this species.

Cultivation
Provide a compost which contains humus; during the growing period the plant requires warmth, sun and moisture; as well as suitable fertilizer; in winter it can be kept at 10ºC (50ºF).

Hybrids
Selenicereus x hallensis 'Hallensis'
(possibly S. grandiflorus x S. macdonaldiae)

'Beckmannii'
Heliocereus speciosus x S. macdonaldiae

Description
Stems
scandent, clambering or sprawling, branching, producing aerial roots, stiff, to 8 m long or more, 10-15 mm thick; ribs 5-6(-7), well marked and prominent, flattened, prominences 2-3mm high; areoles 1,5 mm in diameter, wool brownish or greyish, internodes 1-5 cm, depressed or shallow; spines 3-5, 2 (-5) mm long, brown, reddish brown or yellowish tipped brown, bristles from the lower part of the areole white; epidermis dark glossy green, often shaded purplish, smooth.
Flowers produced from year-old areoles or older, 30-35cm long, nocturnal, not or weakly fragrant; pericarpel ovoid or sphaerical, dark green, covered with long brown hairs and yellowish bristles 10-13 mm long, podaria numerous, bracteoles deltoid, densely imbricate, reddish; receptacle 12 cm long, with adpressed bracteoles with spines and brown hairs in their axills, glaucous green, tinged with brown or striate; oter tepals linear, acute, the outermost reddish brown to reddish purple or orange purple, the innermost yellow, partly reflexed; inner tepals 10 cm long, 20-30 mm wide, lanceolate, oblanceolate or spathulate, more or less toothed at apex, acute, white or creamy white, not forming a regular cup; stamens white, much shorter than inner tepals.; style thick, much longer than stamens, white, stigma lobes 20-25, papillose, yellow.
Fruit 8 cm, blong, podaria numerous with many spines.

Selenicereus x hallensis 'Hallensis'
Photographer unknown.

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