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Showing posts with label rhizomes. Show all posts
Showing posts with label rhizomes. Show all posts

Thursday, 3 October 2024

FFF667 - IRIS

Iris is a genus of about 300 species of flowering plants with showy flowers. It takes its name from the ancient Greek goddess of the rainbow, Iris, referring to the wide variety of flower colours found among the many species. As well as being the scientific name, iris is also very widely used as a common name for all Iris species, though some plants called thus belong to other closely related genera. A common name for some species is 'flags', while the plants of the subgenus Scorpiris are widely known as 'junos', particularly in horticulture.
Irises are popular garden flowers and their blossoms provide wonderful splashes of colour in the Spring garden. The genus is widely distributed throughout the north temperate zone. Their habitats are varied, ranging from cold and montane regions to the grassy slopes, meadowlands and riverbanks of Europe, the Middle East and northern Africa, Asia and across North America. Irises are perennial herbs, growing from creeping rhizomes (rhizomatous irises) or, in drier climates, from bulbs (bulbous irises).
They have long, erect flowering stems which may be simple or branched, solid or hollow, and flattened or have a circular cross-section. The rhizomatous species usually have 3–10 basal sword-shaped leaves growing in dense clumps. The bulbous species have cylindrical, basal leaves.

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Thursday, 11 July 2019

FFF397 - FRIAR'S COWL

Arisarum vulgare, common name Cobra Plant, Friar's Cowl or Larus, is a herbaceous, perennial, with an underground rhizome plant in the genus Arisarum belonging to the family Araceae. Arisarum vulgare reaches on average 10–30 cm high. The leaves of this geophyte plant are basal only, wide, ovate to arrow-shaped, with a petiole 12–15 cm long. The stems are erect and unbranched, usually mottled and grow directly from the underground rhizome. 

A single leaflike bract (spathe) forms a purplish-brown or olive green striped tube about 15 cm long, with an open upper part helmet or hood-shaped curved forward. It encloses a fleshy greenish club-like spike (spadix) bent forward, protruding from the tube and bearing at the bottom minute purple violet flowers. The 20 male flowers are located above the four to six female, with sterile flowers completely missing.

The flowering period extends from Autumn to Spring. The sexes are united in the same individual plant. Pollination is granted by insects (entomophily). The fruits are greenish berries of about 1 centimetre long. This plant native to Mediterranean region of southern Europe and northern Africa, east to the Caucasus, and west to the Canary Islands, the Azores and Madeira.

Arisarum vulgare prefers grassy fields and rocky scrubland, forests and wasteland, mainly in shady and cool places and in moist soils, at an altitude of 0–800 metres above sea level. Grow this cautiously in the garden as it can become quite invasive.

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Thursday, 29 November 2018

FFF366 - DIETES

Dietes bicolor (variously known as African iris or fortnight lily) is a clump-forming rhizomatous perennial plant with long sword-like pale-green leaves, growing from multiple fans at the base of the clump. This species belongs to the Iridaceae (Iris) family. It can form large clumps if left undisturbed for years.

This species is common in horticulture in its native South Africa, where it is often used in public gardens, beautification of commercial premises and along roadsides. The blooms are yellow with three dark purple spots, each surrounded by an orange outline, and are followed by a capsule that may bend the flower stalks to the ground. Ripe seeds (dark brown in colour) are dispersed when the capsule dries and splits. The leaves of Dietes bicolor are narrower than those of Dietes grandiflora and Dietes iridioides, and tend to arch more.

Some species of Dietes are considered "environmental weeds" in parts of Australia, particularly Western Australia, Queensland, and Lord Howe Island.

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Thursday, 25 December 2014

FFF162 - CANNA

Canna (or canna lily, although not a true lily) is a genus of 19 species of flowering plants. The closest living relations to cannas are the other plant families of the order Zingiberales, that is the Zingiberaceae (gingers), Musaceae (bananas), Marantaceae, Heliconiaceae, Strelitziaceae. Canna is the only genus in the family Cannaceae. The APG II system of 2003 also recognises the family, and assigns it to the order Zingiberales in the clade commelinids, in the monocots. The genus is native to tropical and subtropical regions of the New World, from the southern United States (southern South Carolina west to southern Texas) and south to northern Argentina.

The species have large, attractive foliage, and horticulturists have turned it into a large-flowered and bright garden plant. In addition, it is one of the world's richest starch sources, and is an agricultural plant. Although a plant of the tropics, most cultivars have been developed in temperate climates and are easy to grow in most countries of the world as long as they receive at least 6–8 hours average sunlight during the summer, and are moved to a warm location for the winter. The name Canna originates from the Latin word for a cane or reed.

The flowers are typically red, orange, or yellow or any combination of those colours, and are aggregated in inflorescences that are spikes or panicles (thyrses). Although gardeners enjoy these odd flowers, nature really intended them to attract pollinators collecting nectar and pollen, such as bees, hummingbirds, sunbirds, and bats. The pollination mechanism is conspicuously specialised.

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