Epimedium × rubrum

Epimedium × rubrum, known as red barrenwort, is a species of perennial flowering plant in the family Berberidaceae, cultivated in gardens. It is considered to be a hybrid between E. alpinum and E. grandiflorum (hence the multiplication symbol ×).[3] The Royal Horticultural Society has given it the Award of Garden Merit (AGM).[2][4]

Epimedium × rubrum
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Ranunculales
Family: Berberidaceae
Genus: Epimedium
Species:
E. × rubrum
Binomial name
Epimedium × rubrum
E.Morren[1]
Synonyms[2]

E. alpinum 'Rubrum'

Description

Epimedium × rubrum is a deciduous perennial, spreading by rhizomes. It is about 30 cm (1.0 ft) tall. When the young leaves emerge in spring, they are tinged with red. The leaves also turn red in the autumn. The flowers appear with the young leaves in spring, and are borne on a loose raceme. Individual flowers are about 2 cm (0.8 in) across, with red sepals and yellow petals.[2][3]

Flowers of E. × rubrum

Cultivation

Epimedium × rubrum is recommended for cultivation in shade or part-shade in moist soil, although it tolerates drier conditions when well-established. Old foliage should be cut back before the new leaves and flowers appear in spring.[2][3] It was given the Award of Garden Merit by the Royal Horticultural Society in 1993, with a hardiness rating of H7, meaning that it is very hardy, withstanding temperatures below −20 °C (−4 °F).[2]

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References
  1. IPNI Plant Name Query Results for Epimedium rubrum, The International Plant Names Index, retrieved 2013-05-10
  2. "Epimedium × rubrum AGM", RHS Plant Selector, Royal Horticultural Society, retrieved 7 June 2020
  3. "Epimedium × rubrum", Plant Finder, Missouri Botanical Garden, retrieved 2013-05-10
  4. "AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 35. Retrieved 6 February 2018.

Media related to Epimedium × rubrum at Wikimedia Commons

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