Echeveria

Plants may be evergreen or deciduous. Flowers on short stalks (cymes) arise from compact rosettes of succulent fleshy, often brightly coloured leaves.[2] Species are polycarpic, meaning that they may flower and set seed many times over the course of their lifetimes. Often numerous offsets are produced, and are commonly known as "hen and chicks", which can also refer to other genera, such as Sempervivum, that are significantly different from Echeveria. Many species of Echeveria serve important environmental roles, such as those of host plants for butterflies. For example, the butterfly Callophrys xami uses several species of Echeveria, such as Echevelia gibbiflora, for suitable host plants. Even more, these plants are integral to the oviposition process of C. xami and some other butterfly species as well.[3][4]

Echeveria is named for Atanasio Echeverría y Godoy, a botanical illustrator who contributed to Flora Mexicana.[5]

The genus was erected by A. P. de Candolle in 1828, and is named after the 18th century Mexican botanical artist Atanasio Echeverría y Godoy. As of June 2018, the genus consists of about 150 species, including genera such as Oliveranthus and Urbinia that have formerly been split off from Echeveria. Molecular phylogenetic studies have repeatedly shown the genus not to be monophyletic: species of Echeveria cluster with species of Cremnophila, Graptopetalum, Pachyphytum, and Thompsonella as well as species of Sedum sect. Pachysedum. The former Urbinia species do appear to form a monophyletic group within this grouping.[6][7] Although it is clear that Echeveria is not monophyletic, its limits are not clear, and further analyses are needed to determine whether and how the genus should be split.[7]

Echeveria glauca in a Connecticut greenhouse, kept at 77 °F (25 °C)

Many Echeveria species are popular as ornamental garden plants. They are drought-resistant, although they do better with regular deep watering and fertilizing. Most will tolerate shade and some frost, although hybrids tend to be less tolerant. Most lose their lower leaves in winter; as a result, after a few years, the plants lose their compact appearance and need to be re-rooted or propagated. In addition, if not removed, the shed leaves may decay, harboring fungus that can then infect the plant.

Echeveria laui - a species with round, glaucous leaves

E. gibbiflora

Echeveria nodulosa - painted echeveria

Echeveria has been extensively bred and hybridized. The following is a selection of available plants.

Echeveria ‘Perle von Nürnberg’

The following have gained the Royal Horticultural Society’s Award of Garden Merit:[9]

• Dudleya anthonyi (as E. anthonyi)
• Dudleya arizonica Rose (as E. arizonica (Rose) Kearney & Peebles)
• Dudleya attenuata (as E. attenuata and E. edulis var. attenuata)
• Dudleya caespitosa (as E. californica, E. cotyledon, E. helleri, and E. laxa)
• Dudleya candida (as E. candida)
• Dudleya cultrata (as E. cultrata)
• Dudleya cymosa (Lem.) Britton & Rose (as E. cymosa Lem.)
• Dudleya edulis (as E. edulis)
• Dudleya pulverulenta subsp. pulverulenta (as E. argentea and E. pulverulenta)
• Dudleya saxosa subsp. collomiae (as E. collomiae)
• Graptopetalum paraguayense (N.E.Br.) E.Walther (as E. weinbergii hort. ex T.B.Sheph.)
• Pachyveria clavifolia (as E. clavifolia)

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  Flowers of Echeveria ‘Blue Curl’
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  Echeveria cv. ‘Black Prince’
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  The flowers of E. pulvinata are in bright yellowish orange color.
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  E. secunda var. glauca in the UBC Botanical Garden
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  Echeveria ‘Black Prince’ . 2018 Taichung World Flora Exposition, Taiwan.
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  Sculptural quality of Echeveria on display

Wikimedia Commons has media related to Echeveria.

• Flora Mexicana via Biodiversity Library