Difference between revisions of "Gladiolus"

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Revision as of 10:41, 19 April 2007

Gladiolus
Gladiolus
Gladiolus
Plant Info
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Liliopsida
Order: Asparagales
Family: Iridaceae
Subfamily: Ixioideae
Tribe: Ixieae
Genus: Gladiolus
L.

Species
About 260, see text

Gladiolus (from Latin, the diminutive of gladius, a sword) is a genus of flowering plants in the iris family (Iridaceae). Sometimes called the sword lily, the most widely-used English common name for these plants is simply gladiolus (plural gladioli or gladioluses).

The genus Gladiolus contains about 260 species, of which 250 are native to sub-Saharan Africa, mostly South Africa. About 10 species are native to Eurasia. There are 160 species of Gladiolus endemic in southern Africa and 76 in tropical Africa. The species vary from very small to the spectacular giant flower spikes in commerce.

These attractive, perennial herbs are semihardy in temperate climates. They grow from rounded, symmetrical corms, that are enveloped in several layers of brownish, fibrous tunics.

Their stems are generally unbranched, producing 1 to 9 narrow, sword-shaped, longitudinal grooved leaves, enclosed in a sheath. The lowest leaf is shortened to a cataphyll. The leaf blades can be plane or cruciform in cross section.

The fragrant flower spikes are large and one-sided, with secund, bisexual flowers, each subtended by 2 leathery, green bracts. The sepals and the petals are almost identical in appearance, and are termed tepals. They are united at their base into a tube-shaped structure. The dorsal tepal is the largest, arching over the three stamenss. The outer three tepals are narrower. The perianth is funnel-shaped, with the stamens attached to its base. The style has three filiform, spoon-shaped branches, each expanding towards the apex.

The ovary is 3-locular with oblong or globose capsules, containing many, winged brown, longitudinally dehiscent seeds.

These flowers are variously colored, pink to reddish or light purple with white, contrasting markings, or white to cream or orange to red.

The South African species were originally pollinated by long-tongued anthrophorine bees, but some changes in the pollination system have occurred, allowing pollination by sunbirds, noctuid and sphingid moths, long-tongued flies and several others.

Gladioli are used as food plants by the larvae of some Lepidoptera species including the Large Yellow Underwing.

They make very good cut flowers. However, due to their height, the cultivated forms frequently tend to fall over in the wind if left on the plant.

Gladioli have been extensively hybridized and a wide range of ornamental flower colours are available from the many varieties. The main hybrid groups have been obtained by crossing between four or five species, followed by selection: Grandiflorus, Primulines and Nanus.


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Species

The genus Gladiolus has been divided in several sections. Where possible, the sections have been indicated. Most species, however, are only tentatively placed.

Long-tubed Painted Lady
Gladiolus cardinalis
from Curtis's Botanical Magazine 1790
Waved-flowered Gladiolus (Gladiolus undulatus)
from Curtis's Botanical Magazine 1801

ning

Gladiolus-sp..jpg
Gladiolus-delenii.jpg
A Gladiolus hybrid
Gladiolus imbricatus
Gladiolus papilio Hook. f. (sect. Densiflorus)  : Goldblotch Gladiolus

Cultivation

In [[temper ate zone]]s, the corms of most species and hybrids should be lifted in autumn and stored over winter in a frost-free place, then replanted in spring. Some species from Europe and high altitudes in Africa, as well as the small 'Nanus' hybrids, are much hardier (to at least -15°F/-26°C) and can be left in the ground in regions with sufficiently dry winters. Plants are propagated either from small cormlets produced as offsets by the parent corms, or from seed; in either case, they take several years to get to flowering size.

Gladiolus in Popular Culture

The stage character Dame Edna Everage, has adopted the gladiolus as her trademark flower; the flowers often appear in her publicity photos and stage appearances. The singer Morrissey has done the same thing since his days in The Smiths in the 1980s, this use of flowers being rather unique in popular music circles.

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External links

References

  • Peter Goldblatt (1996)- A monograph of the genus Gladiolus in tropical Africa (83 species) (Timber Press)
  • Peter Goldblatt, J.C. Manning (1998)- Gladiolus in southern Africa : Systematics, Biology, and Evolution, including 144 watercolor paintings; (Fernwood Press, Cape Town)
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