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Erysimum

Article Discussion

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Erysimum, or wallflower, is a genus of flowering plants in the cabbage family, Brassicaceae. It includes more than 150 species, both popular garden plants and many wild forms.<ref name=":1" /><ref name=":3">Template:Cite journal</ref><ref name=":4">Template:Cite book</ref><ref name=":5">Template:Cite journal</ref><ref name=":6">Template:Cite journal</ref><ref name=":7">Template:Cite journal</ref> Erysimum is characterised by star-shaped and/or two-sided) trichomes growing from the stem, with yellow, red, pink or orange flowers and multiseeded seed pods.

MorphologyEdit

Wallflowers are annuals, herbaceous perennials or sub-shrubs. The perennial species are short-lived and in cultivation treated as biennials. Most species have stems erect, with a covering of bifid hairs, usually 25 ± 53cm × 2–3mm in size. The leaves are narrow and fixed. The lower leaves are broad and round with backwardly directed lobes, 50–80mm × 0.5–3mm. Stem leaves are linear, entire, growing whitish with 2-fid hairs; 21–43mm × 1.5–2mm. Flower clusters grow at intervals on short equal stalks along the stem, with bright yellow to red or pink bilateral flowers. Flowering occurs during spring and summer. One species, Erysimum semperflorens, native to Morocco and Algeria, has white flowers. The flowering part of the stem ranges from 4 to 7mm. There are four pouch-shaped sepals, light green, 5–7mm × 1.5–2mm.

EtymologyEdit

The genus name Erysimum is derived from the Ancient Greek erysimon ({{#invoke:Lang|lang}}, Sisymbrium officinale<ref>Pedanius Dioscorides. De materia medica. Lily Y. Beck, trans. Third, revised edition. Georg Olms Verlag, 2017. p. 158. Template:ISBN</ref> or Template:Ill,<ref>Template:Cite wikisource</ref> the hedgenettle), itself from the word eryo ({{#invoke:Lang|lang}}) meaning to drag<ref>Archibald William Smith Template:Google books</ref> or eryso, a form of rhyomai ({{#invoke:Lang|lang}}),Template:Citation needed meaning "to ward off" or "to heal" in reference to its medicinal properties.<ref>Ihsan A. Al-Shehbaz. "Erysimum" Flora of North America. Retrieved 1 March 2023.</ref>

The common name "wallflower" derives from the plant's ability to grow successfully in loose wall mortar.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

DistributionEdit

Wallflowers are native to temperate Eurasia, North Africa and Macaronesia, and North America south to Costa Rica. Many wallflowers are endemic to small areas, such as:

CultivationEdit

Most wallflower garden cultivars (e.g. Erysimum 'Chelsea Jacket') are derived from E. cheiri (often placed in Cheiranthus), from southern Europe. They are often attacked by fungal and bacterial disease, so they are best grown as biennials and discarded after flowering. They are also susceptible to clubroot, a disease of Brassicaceae. Growth is best in dry soils with very good drainage, and they are often grown successfully in loose wall mortar. There is a wide range of flower color in the warm spectrum, including white, yellow, orange, red, pink, maroon, purple and russet. The flowers, appearing in spring, usually have a strong, pleasant fragrance. Wallflowers are often associated in spring bedding schemes with tulips and forget-me-nots.<ref name=RHSAZ>Template:Cite book</ref>

The cultivar 'Bowles's Mauve'<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> has gained the Royal Horticultural Society's Award of Garden Merit.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> It can become a bushy evergreen perennial in milder locations. It is strongly scented and attractive to bees.

EcologyEdit

Erysimum is found in a range of habitats across the northern hemisphere, and has developed diverse morphology and growth habits (herbaceous annual or perennial, and woody perennial). Different Erysimum species are used as food plants by the larvae of some Lepidoptera (butterflies and moths) species including the garden carpet (Xanthorhoe fluctuata). In addition, some species of weevils, like Ceutorhynchus chlorophanus, live inside the fruits feeding on the developing seeds. Many species of beetles, bugs and grasshoppers eat the leaves and stalks. Some mammalian herbivores, for example mule deer (Odocoileus hemionus) in North America, argali (Ovis ammon) in Mongolia, red deer (Cervus elaphus) in Central Europe, or Spanish ibex (Capra pyrenaica) in the Iberian Peninsula, feed on wallflower flowering and fruiting stalks. Erysimum crepidifolium (pale wallflower) is toxic to some generalist vertebrate herbivores.<ref name=":2">Template:Cite book</ref><ref name="Giftpflanzen.com">Bleicher Schöterich (Erysimum crepidifolium). In: giftpflanzen.com.</ref>

Most wallflowers are pollinator-generalists, their flowers being visited by many different species of bees, bee flies, hoverflies, butterflies, beetles, and ants. However, there are some specialist species. For example, Erysimum scoparium is pollinated almost exclusively by Anthophora alluadii.

Defensive compoundsEdit

Like most Brassicaceae, species in the genus Erysimum produce glucosinolates as defensive compounds.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> However, unlike almost all other genera in the Brassicaceae, Erysimum also accumulates cardiac glycosides, another class of phytochemicals with an ecological importance in insect defense.<ref>Template:Cite journal</ref><ref name=":0" /> Cardiac glycosides specifically function to prevent insect herbivory<ref>Template:Cite journal</ref> and/or oviposition<ref>Template:Cite journal</ref> by blocking ion channel function in muscle cells.<ref>Template:Cite journal</ref> These chemicals are toxic enough to deter generalist,<ref>Template:Cite journal</ref> and even some specialist<ref>Template:Cite journal</ref> insect herbivores. Cardiac glycoside production is widespread in Erysimum, with at least 48 species in the genus containing these compounds.<ref name=":0">Template:Cite journal</ref><ref name=":8">Template:Cite journal</ref> Accumulation of cardiac glycosides in Erysimum crepidifolium, but not other tested species, is induced by treatment with jasmonic acid and methyl jasmonate,<ref>Template:Cite journal</ref><ref name=":8" /> endogenous elicitors of chemical defenses in many plant species.<ref>Template:Cite journal</ref> Molecular phylogenetic analysis indicates that Erysimum diversification from other Brassicaceae species that do not produce cardiac glycosides began in the Pliocene (2.33–5.2 million years ago),<ref>Template:Cite journal</ref><ref name=":1">Template:Cite journal</ref> suggesting relatively recent evolution of cardiac glycosides as a defensive trait in this genus.

Escape from herbivoryEdit

The evolution of novel chemical defenses in plants, such as cardenolides in the genus Erysimum, is predicted to allow escape from herbivory by specialist herbivores and expansion into new ecological niches.<ref>Template:Cite journal</ref> The crucifer-feeding specialist Pieries rapae (white cabbage butterfly) is deterred from feeding and oviposition by cardenolides in Erysimum cheiranthoides.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> Similarly, Anthocharis cardamines (orange tip butterfly), which oviposits on almost all crucifer species, avoids E. cheiranthoides.<ref>Template:Cite journal</ref> Erysimum asperum (western wallflower) is resistant to feeding and oviposition of Pieris napi macdunnoughii (synonym Pieris marginalis, margined white butterfly).<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> Two crucifer-feeding beetles, Phaedon sp. and Phyllotreta sp., were deterred from feeding by cardenolides that were applied to their preferred food plants.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> Consistent with the hypothesis of enhanced speciation after escape from herbivory, phylogenetic studies involving 128 Erysimum species indicate diversification in Eurasia between 0.5 and 2 million years ago, and in North America between 0.7 and 1.65 million years ago.)<ref name=":1" /> This evolutionarily rapid expansion of the Erysimum genus has resulted in several hundred known species distributed throughout the northern hemisphere.<ref name=":1" /><ref name=":3" /><ref name=":4" /><ref name=":5" /><ref name=":6" /><ref name=":7" />

Ethnobotanical uses of ErysimumEdit

Erysimum species have a long history of use in traditional medicine. In Naturalis Historia by Pliny the Elder (Template:Circa), Erysimum is classified as a medicinal rather than a food plant. Erysimum cheiri is described as a medicinal herb in De Materia Medica by Pedanius Dioscorides (Template:Circa), which was the predominant European medical pharmacopeia for more than 1,500 years. Other medieval descriptions of medicinal herbs and their uses, including the Dispensatorium des Cordus by Valerius Cordus (1542), Bocks Kräuterbuch by Hieronymus Bock (1577), and Tabernaemontanus' Neuw Kreuterbuch by Jacobus Theodorus Tabernaemontanus (1588), also discuss applications of E. cheiri. In traditional Chinese medicine, Erysimum cheiranthoides has been used to treat heart disease and other ailments.<ref>Template:Cite book</ref> Although medical uses of Erysimum became uncommon in Europe after the Middle Ages,<ref>Template:Cite journal</ref> Erysimum diffusum, as well as purified erysimin and erysimoside, have been applied more recently as Ukrainian ethnobotanical treatments.<ref>Template:Cite journal</ref>

Selected speciesEdit

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GalleryEdit

  • Erysimum wittmanii a1.jpg

    Erysimum witmanii inflorescence

  • ErysimumChelseaJacket.jpg

    Erysimum 'Chelsea Jacket'

  • Erysimum helveticum.jpg

    Erysimum helveticum

  • Erysimum allionii.JPG

    Erysimum allionii inflorescence

  • Erysimum x linifolium.jpg

    Erysimum × linifolium 'Bowles's Mauve'

  • ErysimumCheiranthoides.jpg

    Erysimum cheiranthoides

ReferencesEdit

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External linksEdit

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