FLORAL FRIDAY FOTOS: Acanthaceae

Showing posts with label Acanthaceae. Show all posts

Thursday, 12 January 2023

FFF577 - SKYVINE

Thunbergia grandiflora is an evergreen vine in the family Acanthaceae. It is native to China, India, Nepal, Indochina and Burma and widely naturalised elsewhere. Common names include Bengal clockvine, Bengal trumpet, blue skyflower, blue thunbergia, blue trumpetvine, clockvine, skyflower and skyvine.

Plants may grow to about 20 metres in height and have a long root system with a deep tap root. The stalked, opposite leaves, which have a rough surface, are quite variable in shape. They may be triangular or ovate and the margins may be toothed, lobed or entire. Length is up to 20 cm and width is up to 6 cm.

The blue to mauve flowers are about 8 cm across with a 4 cm long tube that is pale yellow inside. These are followed by pods containing seeds that are ejected several metres upon ripening. Plants also reproduce from segments that are washed down watercourses. With a minimum temperature of 10–13 °C, this plant is cultivated as a houseplant in temperate regions, and has gained the Royal Horticultural Society's Award of Garden Merit.

The species has become a serious environmental weed in Australia on disturbed land along watercourses and in the wet tropics where it smothers other vegetation. It is commonly seen north of Sydney where it has been cultivated for many years.

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Thursday, 17 February 2022

FFF532 - ACANTHUS

Acanthus mollis, commonly known as bear's breeches, sea dock, bear's foot plant, sea holly or oyster plant, is a species of plant in the family Acanthaceae and is native to the Mediterranean region. It is a leafy, clump-forming perennial herb, with a rosette of relatively large, lobed or toothed leaves, and purplish and white flowers on an erect spike.

It is a leafy, clump-forming perennial herb with tuberous roots. It has a basal rosette of dark glossy green, lobed or divided, glabrous leaves 50 cm long and 30 cm wide on a petiole 20–30 cm long. The flowers are borne on an erect spike up to 200 cm tall emerging from the leaf rosette. The sepals are purplish and function as the upper and lower lips of the petals, the upper lip about 4 cm long and the lower lip 3 cm long. The petals are about 4–4.5 cm long and form a tube with a ring of hairs where the stamens are attached. Flowering occurs in summer and the fruit is a sharply-pointed capsule about 2 cm long containing one or two brown seeds about 14 mm long and 8 mm wide.

Acanthus mollis was first formally described in 1753 by Carl Linnaeus in his book Species Plantarum. The name of the genus derives from the Greek name of the plant ἄκανθος ákanthos. This ἄκανθος ákanthos is related to ἄκανθα ákantha meaning "thorn" referring to the thorn-bearing sepals, or any thorny or prickly plant in Greek. The Latin name of the species, mollis meaning "soft, smooth", refers to the texture of the leaves.

Acanthus mollis is entomophilous, pollinated only by bees or bumble bees large enough to force their way between the upper sepal and the lower, so that they can reach the nectar at the bottom of the tube. Bear's breeches is regarded as invasive in some countries, including Australia and New Zealand.

The shape of the leaf of this plant inspired the ancient Greek sculptor Callimachus (5th c. BCE) to model the capital of the Corinthian column. Since then, the Corinthian order column has been used extensively in Greco-Roman and Classical architecture. For centuries, stone or bronze stylized versions of acanthus leaves have appeared as acanthus decorations on certain styles of architecture and furniture. Virgil described Helen of Troy as wearing a dress embroidered with acanthus leaves.

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Thursday, 18 November 2021

FFF519 - JACOBINIA

A member of the Acanthaceae family, the Brazilian plume flower or jacobinia (Justicia carnea) is a shade-loving, soft-wooded shrub (ht 1.5m) with large, lush leaves. Thick plumes of white, pale pink or deep pink tubular flowers appear in regular flushes from early summer to late autumn. A form with dark purplish underleaves is known as 'Radiant' - perhaps more correctly should be called 'Huntington Form'.

Justicia carnea needs hard pruning in late winter, and regular dead-heading during summer will help to promote new blooms. It will also flourish in sunny spots but is useful for shaded sites, as are so many of the Acanthaceae family, which do so well in temperate climates. Whilst it will stand neglect, it responds well to feeding and watering. It is easily propagated from cuttings. It is a good companion to hydrangeas, Plectranthus species, ferns and camellias. The white form looks pretty with silver-leaved companions, such as Plectranthus argentatus and Pilea cadierei.

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Thursday, 31 October 2019

FFF414 - HAWTHORN

Crataegus (from the Greek κράτος kratos strength and άκης akis sharp, referring to the thorns of some species) commonly called hawthorn, thornapple, May-tree, whitethorn, or hawberry, is a large genus of shrubs and trees in the family Rosaceae, native to temperate regions of the Northern Hemisphere in Europe, Asia and North America.

The name "hawthorn" was originally applied to the species native to northern Europe, especially the common hawthorn C. monogyna, and the unmodified name is often so used in Britain and Ireland. The name is now also applied to the entire genus and to the related Asian genus Rhaphiolepis. The name haw, originally an Old English term for hedge, applies to the fruit.

Illustrated here is Crataegus Laevigata Rosea Flore Pleno, which is a small upright tree with a compact rounded head. Impressive heads of double salmon-pink flowers smother the tree in late spring and the tree sets the occasional red fruit. Tolerant of strong winds. Excellent street tree.

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Thursday, 10 December 2015

FFF212 - CROSSANDRA

Crossandra infundibuliformis (firecracker flower), is a species of flowering plant in the family Acanthaceae, native to southern India and Sri Lanka. It is an erect, evergreen subshrub growing to 1 m with glossy, wavy-margined leaves and fan-shaped flowers, which may appear at any time throughout the year. The flowers are unusually shaped with 3 to 5 asymmetrical petals. They grow from four-sided stalked spikes, and have a tube-like 2 cm stalk. Flower colours range from the common orange to salmon-orange or apricot, coral to red, yellow and even turquoise.

This plant requires a minimum temperature of 10 °C, and in temperate regions is cultivated as a houseplant. It is usually grown in containers but can be attractive in beds as well. The flowers have no perfume but stay fresh for several days on the bush. A well-tended specimen will bloom continuously for years. It is propagated by seeds or cuttings. This plant has gained the Royal Horticultural Society's Award of Garden Merit.

In India and Sri Lanka, the tiny flowers are often strung together into strands, sometimes along with white jasmine flowers and therefore in great demand for making garlands which are offered to temple deities or used to adorn women’s hair. The common name "firecracker flower" refers to the seed pods, which are found after the flower has dried up, and tend to "explode" when near high humidity or rainfall. The "explosion" releases the seeds onto the ground, thereby creating new seedlings.

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