Matthiola incana

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Matthiola incana
Matthiola incana6.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Brassicales
Family: Brassicaceae
Genus: Matthiola
Species:
M. incana
Binomial name
Matthiola incana

Matthiola incana is a species of flowering plant in the cabbage family Brassicaceae. Common names include Brompton stock, common stock, hoary stock, ten-week stock, and gilly-flower. [1] The common name stock usually refers to this species, though it may also be applied to the whole genus Matthiola . The common name "night-scented stock" or "evening-scented stock" is applied to Matthiola longipetala . [2]

Contents

Matthiola incana is a common garden flower, available in a variety of colours, many of which are heavily scented and also used in floristry.

Description

Some stocks are grown as annuals (the "ten-week stocks") that reach heights of growth of 20 to 28 centimeters thick, woody at the base and with numerous foliar scars and branches with terminal rosettes of leaves. The plants are starry, with whitish hairs. The leaves are rounded and ash-coloured. The fragrant flowers are white, cream yellow, pink, red, purple or blue. The scar flaps on the back are swollen. The pods are compressed, their flaps are flattened. Leaves whole or slightly sinuate, lanceolate, attenuated on a short petiole. Pedicels are 10–12 mm (0.39–0.47 in) in anthesis, 12–17 mm (0.47–0.67 in) in fruiting, erect-patents. Sepals are around 11–14 mm (0.43–0.55 in), with narrow scarious margin, subtle, green or somewhat purple. Petals are 25–30 mm (0.98–1.18 in), with a nail almost as long as the limb, ranging between white, pink, violet or purple. Seeds are 2–3 mm, suborbicular, with a whitish wing. The flower is supported by a 10–20 mm (0.39–0.79 in) stalk. [3]

Distribution

It is native to southern Europe, from the Balearics to the former Yugoslavia, and is naturalized in the western part of the Mediterranean region, roughly in the same area as the olive tree. The plant prefers calcareous soils, and often grows on cliffs overlooking the sea, or on old walls. It is a plant of the coast, but it can be found, naturalized, even in the hinterland up to 600 m (1,970 ft) of altitude. [4]

Usage

Double-flowered stock 2006-12-01Matthiola05.jpg
Double-flowered stock

Matthiola incana is widely used as an ornamental plant for summer bedding, and as a cut flower and aromatic plant. The species has been in cultivation since at least the 16th century. The flowers can be simple or double, medium or large. [5]

Varieties

These varieties are sown in spring (generally from March onwards in colder areas of the Northern Hemisphere, earlier in regions with mild winters). Other varieties take longer to develop and are treated as biennials. These are often referred to as "Brompton stocks". In cool temperate regions they are generally sown in summer (June and July) to flower in the following spring. The extra trouble of overwintering the plants is compensated for by the showy spring floral display. In hard winters there may be some mortality and a well-drained sheltered site suits them best. [6]

Intermediate varieties (sometimes called "East Lothian" stocks as they originated in southern Scotland) may be treated either as annuals or biennials. If treated as annuals they give a fine late summer and autumn display. Maltese stocks (Matthiola incana ssp. melitensis), known in Maltese as "ġiżi ta' Malta", is treated as a perennial and has fleshier and fuzzy leaves with flowers in a light violet colour, while an even rarer variety of it exhibits white flowers. [7] 'Cinderella series' has gained the Royal Horticultural Society's Award of Garden Merit. [8] [9]

Genetics

Double-flowered stocks are prized by gardeners for their floral display but are sterile. They therefore have to be produced from the seed of single-flowered plants. The double-flowered form is caused by a recessive gene variant (allele) in the homozygous condition. Therefore, according to the Mendelian laws of genetics, heterozygous single-flowered stocks should produce one quarter doubles in their offspring and one third of the singles should be pure breeding singles incapable of throwing doubles.

Selection over the centuries has greatly improved these ratios, resulting in the so-called "ever-sporting" stocks, in which pure-breeding singles are absent and the proportion of doubles is one half or greater. The reason was first worked out by the Danish geneticist Øjvind Winge. [10] In these varieties, the singleness allele is closely linked to a pollen-lethal gene. Thus the pollen (male) contribution to seed is always a doubleness allele, while the female contribution is either a doubleness or a singleness allele. The result of this linkage is that doubles and singles are produced in 50:50 ratios and there are no pure-breeding singles.

Furthermore, many modern strains produce doubles in even higher proportions: 60% or even 80%. This is due to generations of selection for further linked viability effects, producing higher mortality of heterozygous singles, relative to homozygous doubles.

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References

  1. ↑ "Matthiola incana". Germplasm Resources Information Network . Agricultural Research Service, United States Department of Agriculture.
  2. ↑ RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN   978-1405332965.
  3. ↑ Hickman, JC (1993). Higher Plants of California 1-1400. The Jepson Manual. Berkeley: University of California Press.
  4. ↑ Sandro Pignatti (1982). Flora of Italy. Vol. 1. Bologna: Edagricole. p. 394. ISBN   88-506-2449-2.
  5. ↑ Eckehart J. Jäger; Friedrich Ebel (2008). Peter Hanelt; Gerd K. Müller (eds.). Rothmaler - Exkursionsflora von Deutschland[Rothmaler - excursion flora of Germany] (in German). Vol. 5: Herbaceous ornamental and useful plants. Berlin Heidelberg: Spektrum Akademischer Verlag. ISBN   978-3-8274-0918-8.
  6. ↑ Jaakko Jalas; Juha Suominen (1994). Atlas Florae Europaeae. Vol. 10. Helsinki. pp. 112–113. ISBN   951-9108-09-2.{{cite book}}: CS1 maint: location missing publisher (link)
  7. ↑ Stephen Mifsud. "Matthiola incana subsp. melitensis (Maltese Stocks)".
  8. ↑ "Matthiola incana Cinderella series". www.rhs.org. Royal Horticultural Society. Retrieved 26 February 2020.
  9. ↑ "AGM Plants - Ornamental" (PDF). www.rhs.org. Royal Horticultural Society. July 2017. p. 107. Retrieved 18 February 2020.
  10. ↑ O. Winge (1931). "The inheritance of double flowers and other characters in Matthiola". Zeitschrift für Züchtung. Reihe a Pflanzenzüchtung. 17: 118–135.
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