Chionodoxa

Chionodoxa, known as glory-of-the-snow, is a small genus of bulbous perennial flowering plants in the family Asparagaceae, subfamily Scilloideae, often included in Scilla. The genus is endemic to the eastern Mediterranean, specifically Crete, Cyprus and Turkey. The blue, white or pink flowers appear early in the year making them valuable garden ornamentals. The common name of the genus is based on the habit of flowering in high alpine zones when the snow melts in spring.[1]
Chionodoxa
Chionodoxa
Glory of the Snow in the snow.JPG
Glory-of-the-snow in the snow
Scientific classification e
Kingdom: Plantae
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Asparagaceae
Subfamily: Scilloideae
Genus: Chionodoxa
Boiss.
Species

See text.

Chionodoxa, known as glory-of-the-snow, is a small genus of bulbous perennial flowering plants in the family Asparagaceae, subfamily Scilloideae, often included in Scilla. The genus is endemic to the eastern Mediterranean, specifically Crete, Cyprus and Turkey. The blue, white or pink flowers appear early in the year making them valuable garden ornamentals. The common name of the genus is based on the habit of flowering in high alpine zones when the snow melts in spring.[1]

Taxonomy

Close-up of a flower, showing the 'cup' formed by the flattened filaments of the stamens.

Chionodoxa is distinguished from the closely related genus Scilla by two features: the tepals are joined at their bases to form a tube rather than being free; and the stamens have flattened stalks (filaments), which look almost like a cup in the centre of the flower.[2] These differences are not considered by some botanists as sufficient to create a separate genus, and Chionodoxa species are often included in Scilla.[3] Chionodoxa is also not recognised as a separate genus from Scilla by the World Checklist of Selected Plant Families,[4] or the Angiosperm Phylogeny Website.[5]

The taxonomy of the genus is confused. Several of the species are very similar, and the number of species recognized as distinct varies significantly from one source to another. For example, plants occurring in Crete have at one time or another been put into three species: C. albescens, C. cretica and C. nana. Sfikas' Wild flowers of Crete recognizes only two of these (C. cretica and C. nana);[6] the Natural History Museum's checklist of the Cretan Flora recognizes only one (C. nana, as Scilla nana).[7] The Royal Horticultural Society distinguishes between C. forbesii and C. siehei; other botanists recognize only C. forbesii.[3]

Assuming there are six species, as listed below, three occur in west Turkey, one in south-west Turkey, one in Crete and one in Cyprus.[1] Garden plants have naturalised outside of their native range, e.g. in the UK, Germany, Austria and the Netherlands. A natural hybrid C. siehei x C. luciliae also occurs.

Species

Cultivation

Self-sown carpet of Chionodoxa siehei under a deciduous shrub, flowering in early April in the West Midlands, England.

There has been considerable confusion over the correct names of species grown in gardens, with the most common being called either C. luciliae, C. forbesii or C. siehei. A 2005 Royal Horticultural Society publication which illustrates all three of these species states that the most common garden species is properly called C. siehei.[3]

Three species were awarded the RHS Award of Garden Merit (H4 – hardy outdoors anywhere in the British Isles) in 1993 which was re-confirmed in 2004: C. luciliae,[8] C. sardensis,[9] and C. siehei.[10] (C. nana subsp. albescens was also given the award subject to availability.)

All can be bought as dry bulbs and planted while dormant in late summer or early autumn at a depth of 8–10 cm. They require light when in growth, but can be grown under deciduous trees or shrubs, as their foliage dies down after flowering. All flower in early Spring, C. sardensis usually being the earliest. C. siehei seeds freely in many gardens, and can create a carpet of blue.[11] In addition to the common purplish-blue varieties, Chionodoxa siehei is sold as pink and white cultivars.[12][13]

Notes and references

Bibliography

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