Epiphyllum laui

Epiphyllum laui is a cactus species native to Mexico and grown as an ornamental.[1]

Epiphyllum laui
Photo: Alfred Lau
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Cactaceae
Subfamily: Cactoideae
Genus: Epiphyllum
Species:
E. laui
Binomial name
Epiphyllum laui
Kimnach

Etymology

This species is named after Alfred B. Lau who discovered this species in 1975.

History

Even though this plant was discovered in 1975, it was not described until 1990[2] as it failed to flower at the Huntington Botanical Garden. However, it flowered profusely for Alfred Lau in Mexico, as in several European collections, so Myron Kimnach knew that the plant represented a new species. In 1989, it finally flowered at Huntington and Kimnach was able to write a scientific description. Kimnach described the plant as "outstandingly attractive".[2]

Origin and habitat

E. laui is found in Mexico (Chiapas). It grows as a lithophyte and an epiphyte at altitudes of 1,800 to 2,000 meters.

Systematics

E. laui is most closely allied to Epiphyllum crenatum and Epiphyllum anguliger.

Cultivation

E. laui is a fast-growing plant but is known to suffer from die-back of stem tissue. Myron Kimnach had to wait 10 years for the first flowers. However, it has been easily cultivated in Europe. In cultivation E. laui seems to prefer high humidity and soil moisture, as well as rather cool conditions. Plants have survived temperatures near freezing in Germany. As the die-back can be caused by a viral infection, it is recommended not to propagate cuttings from plants known to exhibit viral damage.

Description

Stems branching basally or laterally; base narrow to subterete for 1–2 cm, flattened portions linear, subobtuse, 5–7 cm wide, midrib prominent, crenate, often slightly undulate; areoles hidden by brownish cream leaves, 2 mm wide and 1 mm long, brownish cream; spines 1-3 (-5), 3–5 mm long, hairlike, brownish yellow; epidermis shiny green, smooth, apices often reddish or brownish.

Flowers 15–16 cm long, 14–16 cm wide, opening in the evening and remain fully expanded for two days, funnelform; pericarpel inconspicuous, ca 2 cm long; olive green, tinged pinkish; bracteoles that subtend spare areolar wool and 1-3 thin yellowish spines; the remainder of pericarpel 9 cm long, yellowish olive, tinged pinkish or orange-yellow by light; bracteoles 1–2, without areolar wool; outer tepals recurving to nearly rotate or ascending, attached within 1,5 cm of receptacle, linear-oblanceolate, rather abruptly acute, 7–9 cm long, 5–10 mm wide, outermost reddish orange or reddish yellow, innermost pure yellow; inner tepals 11, forming a campanulate cluster, obovate-oblong, abruptly aristate, 6–7 cm long, 20–22 mm wide, outermost white tinged yellow, innermost pure white; stamens 4 cm long, forming a throat-circle at receptacle apex, cream; anthers light yellow; style 12,5 cm long, lobes 8, expanding and recurving, cream.

Fruit oblong, (4-5) 6 (-8) cm long, 2-3 (3-4) cm thick at middle, carmine red, flesh white, pink when fully ripe. Seeds ovoid-reniform, 2 mm long, 1 mm thick, black.

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References
  1. Christopher Brickell (2011). American Horticultural Society Encyclopedia of Plants and Flowers. ISBN 0756675081.
  2. Myron Kimnach (1990). "Epiphyllum laui, a new diurnal-flowering species". Cactus and Succulent Journal. 62 (3): 148–151.
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