Mairia coriacea

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Mairia coriacea
Mairia coriacea Rebelo 2.jpg
Photos: Tony Rebelo and Nick Helme
Mairia coriacea Helme 1.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Mairia
Species:
M. coriacea
Binomial name
Mairia coriacea

Mairia coriacea is a perennial plant assigned to the family Asteraceae. It has broad, tough and leathery, evergreen leaves. These have a narrowed foot and an entire margin or a few shallow, irregular teeth. They grow in a rosette directly from the rootstock. The plant produces flower heads with one whorl of white to mauve ray florets around many yellow disc florets, with one or few on top of a dark reddish, woolly stalk. Flower heads appear after the overhead vegetation burnt down, often destroying the leaves in the process. [2] It can be found in the southern mountains of South Africa's Western Cape province. It is called leather leaves in English. [2]

Contents

Taxonomy

A specimen of leather leaves was collected by Harry Bolus in December 1894, on a mountain slope behind Houhoek, Caledon County, at an altitude of about 1,100 m (3,600 ft). He called it Mairia coriacea in 1899. [3] There are no synonyms known for this name. [4]

Common names that are in use for several Mairia species, including fire aster in English and pluimaster in Afrikaans, but the name leather leaves is only applied to Mairia coriacea. [2]

Description

Mairia coriacea is a geophytic perennial herb of about 12 cm (4+45 in) high, with dense, silky, orange brown hairs on its growing points. It has a rizome with succulent, dark brown to black roots of up to about 20 cm (8 in) long and 3–4 mm (0.12–0.16 in) thick. It usually has up to about six leathery, bright lime-green leaves per growing point, which are seated or have a leaf stalk of up to 10 cm (4 in) long, and are flat or curve downwards. The leaf blade is mostly inverted egg-shaped, sometimes elliptic or broadly elliptic, 6–23 cm (2+25–9 in) long and 3–21 cm (1+158+15 in) wide. The leaf's tips vary from blunt to pointy, the thickened margins are usually entire or may have some broad teeth towards the tip. The leaves each have mostly five, slightly curved main veins, interconnected by a net of distinct secundairy veins. The leaf surfaces are variably hairy: hairless on both surfaces or the upper surface woolly to later hairless and sparsely to densely woolly on the lower surface, but the leaf surface always remains visible through the coating of hair. [3]

Flowering usually occurs after a fire, so when flowers stalks emerge, the leaves will mostly be burnt off or scorched. From each leaf rosette rise two to eight, ribbed inflorescence stalks of usually 3–10 cm (1+15–4 in) long (full range 5–17 cm (2–6+35 in), which are tinged dark purple further up, with a thin or dense layer of white woolly hairs and scattered dark red glandular hairs. The stalks carry some dark purple line-shaped or narrowly inverted egg-shaped bracts of 1–3 cm (251+15 in) long and 2–4 mm (0.04–0.08 in) wide, with a pointy tip, and a hairless surface or with some woolly and glandular hairs, but densely woolly in the axils. Each stalk carries mostly a single, rarely up to three flower heads. Each flower head consist of ray florets and disc florets which are encircled by mostly about twenty four (but up to thirty) involucral bracts in three or four overlapping whorls. The involucre is broadly bell-shaped, 12–15 mm (0.47–0.59 in) long and usually 17–22 mm (0.67–0.87 in), exceptionally up to 30 mm (1.2 in) in diameter. The outer bracts are narrowly oval in shape, mostly 6–7 mm (0.24–0.28 in) (but up to 11 mm) long and 134–214 mm (full range 112–3 mm) wide, with pointy tips and a purplish, woolly fringed margin and the surface with few woolly and glandular hairs. The inner whorl of bracts are very narrowly inverted egg-shaped to oblong, usually 11–12 mm (0.43–0.47 in), rarely up to 16 mm (0.63 in) long and 134–2 mm (0.07–0.08 in) wide with the tip tapering to a point, a papery margin, purple in upper part, long woolly fringed and the surface almost hairless. [3]

Each flower head has about twenty female ray florets, with line-shaped, pink, bright violet or whitish straps of 9–1112 sometimes up to 30 mm long, mostly with three (sometimes five or seven) veins, with three teeth at the tip, and the tube at its base with many glandular hairs. Although functionally female, five staminodes can be found surrounding the style shaft. The style is 5–7 mm (0.20–0.28 in) long, and the style branches ar its tip are purplish in colour, line–shaped to elliptic, 1–112 mm long, with a blunt tip. The ray florets surround many bisexual disc florets with a yellow corolla up to 7.2–8.0 mm (0.28–0.31 in) long, which is mostly shorter than the pappus. The tube-shaped part at the base carries glandular hairs, and the five triangular lobes are recurved at the top, often carry a few hairs and have a resin duct along their margin. In the center of each corolla are five anthers merged into a tube, through which the style grows when the floret opens, hoovering up the pollen on its shaft. The anthers are 112–2 mm long, with small triangular appendages at the top. The style is approximately 8 mm (0.31 in) long with two dark red to purplish, narrowly elliptic branches of 1–2 mm (0.039–0.079 in) long, each with a deltoid appendage of about 0.2 mm (0.0079 in) wide and 0.3 mm (0.012 in) long. Surrounding the base of the corollas of both ray and disc florets are many, whitish or straw-coloured, pappus bristles in two whorls. The outer whorl consists of a few delicate, free, feathered bristles of 2.7–3.0 mm (0.11–0.12 in) long. The inner whorl is composed of feathery bristles of 6–9 mm (0.24–0.35 in) long, merged into a ring and barbed at their foot. The dry, one-seeded indehiscent fruits called cypselae are cylinder- to spindle-shaped in both ray and disc florets, 412–5 mm long and 1–113 mm wide, bright to light brown in colour, each with four or five narrow, hardly visible ribs, and the surface adorned with silky silvery twin hairs of 0.70–0.75 mm (0.028–0.030 in) long with distinctly unequal arms, and shiny, golden yellow glands. [3]

Flowering is erratic and occurs from six to eight weeks after a fire has destroyed the overhead vegetation. Sources differ in when this may be and indicate periods between October and June. [2] [3] [5]

Mairia coriacea differs from other Mairia species by its large, leathery leaves with five curved main veins, net-veined leaves with an entire margin or sometimes with a few shallow, irregular positioned teeth towards the tip. [3]

Distribution, habitat and ecology

Mairia coriacea can only be found in the wild in the southwest of the Western Cape province of South Africa, where it grows on the Cape Peninsula and from the Kogelberg along the coast to the delta of the Breede River. [3] It grows in fynbos vegetations on rocky slopes in the mountains along the coast, or on sandy flats at the foot of limestone hills. [6]

Conservation

The continued survival of leather leaves is considered to be of least concern, because it has a stable population, is widespread and common, and no substantial threats have been identified. [6]

Related Research Articles

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<i>Felicia cymbalariae</i> Perennial plant in the daisy family from South Africa

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<i>Felicia brevifolia</i> A shrublet in the daisy family from South Africa and Namibia

Felicia brevifolia is an evergreen, richly branched shrub of up to 112 m (5 ft) high, that is assigned to the family Asteraceae. It has elliptic to wedge-shaped leaves, of between 12 and 112 cm long, green to gray-green, many with several teeth. The flower heads have about fifteen blue-violet ray florets, encircling many yellow disc florets. This species grows in southern Namibia and the west of South Africa.

<i>Felicia namaquana</i> A annual plant in the daisy family from Namibia and South Africa

Felicia namaquana is a glandular-hairy, branching annual plant of up to 25 cm (10 in) high that is assigned to the family Asteraceae. It is sometimes called Bloublommetjie or pers poublom in Afrikaans. Flowering occurs between May and October. It grows in Namibia and South Africa.

<i>Felicia amoena</i> A perennial or biennial plant in the daisy family from South Africa

Felicia amoena is a variably hairy, sometimes glandular, biennial or perennial plant, of about 25 cm (10 in) high, that is assigned to the family Asteraceae. It is somewhat woody at its base, roots at the nodes if these contact the soil, and has ascending branches. The leaves are oppositely arranged along the stems at and just above a branching fork, further up the leaves alternate. The flower heads sit individually on up to 12 cm long stalks. They are 2–3 cm in diameter and consist of about twelve to twenty five heavenly blue ray florets that surround many yellow disc florets. Three subspecies have been recognised, that differ in width of the leaves and the involucral bracts, the size of the heads and number of ray florets and in having glandular hairs. These can be found in coastal sands and inland areas in the Western Cape and Eastern Cape provinces of South Africa. Flower heads can be found from June till October.

Felicia wrightii is a low, up to 20 cm (8 in) high, perennial, herbaceous plant with conspicuous basal leaf rosettes, and runners that end in rosettes. It has narrow bracts along the inflorescence stalks on top of which are individual flower heads with an involucre of three whorls of bracts, about sixteen ray florets with about 1 cm long, pale blue straps, that encircle many yellow disc florets. No fertile seeds have been found, so this species may solely reproduce vegetatively. The species is only known from one location in the KwaZulu-Natal Drakensberg, where it grows on damp stream banks.

<i>Felicia bergeriana</i> A annual plant in the daisy family from South Africa

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<i>Mairia burchellii</i> Perennial plant in the daisy family from South Africa

Mairia burchellii is a tufted perennial plant of up to 15 cm (6 in) assigned to the family Asteraceae. It has narrow leaves of up to 5 mm (0.20 in) wide, with single main vein and an entire margin. Flower heads only occur after a fire has destroyed the standing vegetation, mostly in November or between February and June. The flower heads sit individually or with a few on the tip of a purplish stalk, with a few narrow bracts, and consist of a row of pinkish ray florets around many yellow disc florets. It can be found in the southwest of the Western Cape province of South Africa.

<i>Mairia petiolata</i> Perennial plant in the daisy family from South Africa

Mairia petiolata is a tufted, variably hairy, perennial plant of up to 15 cm (6 in) assigned to the family Asteraceae. Its leaves are in a ground rosette, and have a stalk of mostly 2–5 cm long and an inverted egg-shaped to elliptic, 612–9 cm (2.6–4.6 in) long and 2–3 cm wide leaf blade, with a toothed margin. It mostly has two flower heads at the tip of the branches of each erect, dark reddish brown scape. The flower heads have a bell- to cup-shaped involucre that consists of 20–24, purplish, overlapping bracts in 3–4 whorls. These protect 12–16 pink, ray florets, surrounding many yellow disc florets. This species was only seen flowering once, in December. It is known from one location in the Langeberg, Western Cape province of South Africa.

<i>Mairia robusta</i> Perennial plant in the daisy family from South Africa

Mairia robusta is a tufted, white-woolly, perennial, herbaceous plant of up to 30 cm (1 ft) high, that is assigned to the family Asteraceae. It has large, robust, hard and leathery leaves, with a white woolly hairy, nontransparent underside, while the felty hairs on the top are lost with age. Only at a few occasions, flowers have been observed, in June, October and December, always after a fire. The flower heads sit individually at the tip of white-woolly scapes, with 14–16 purplish pink to white ray florets surrounding a yellow disc. M. robusta is an endemic species that is restricted to rocky mountain slopes in the Western Cape province of South Africa.

<i>Mairia hirsuta</i> Perennial plant in the daisy family from South Africa

Mairia hirsuta is a tufted perennial, herbaceous plant of up to 40 cm high, that is assigned to the family Asteraceae. Most of its narrow to broad elliptic or inverted egg-shaped leaves are part of the basal rosette, have margin that is rolled under, with rounded or pointy teeth or with some peg-like extensions, lightly woolly on the upper surface and densely woolly on the underside, but always the green remains visible. Flower heads have been found from July to November, mostly after a fire or when the soil has been disturbed. The species can be found in the southern mountains of the Western Cape province of South Africa.

Felicia clavipilosa is an upright, richly branched shrub of up to 60 cm (2 ft) high, that is assigned to the family Asteraceae. It has alternately arranged leaves, and flower heads with 3–4 whorls of involucral bracts with many yellow disc florets in the centre. Very characteristic for the species are the short club-shaped hairs on its fruits. There are two subspecies. Subsp. clavipilosa has narrowly lance-shaped entire leaves with one vein and pale mauve ray florets. Subspecies transvaalensis has lance-shaped leaves with one or three veins and white ray florets. The species occurs in southern Africa, with subsp. clavipilosa having a western distribution in Zambia, Zimbabwe, Namibia, Botswana and South Africa, and subsp. transvaalensis restricted to the east, from Zimbabwe, through Botswana to South Africa. The subspecies transvaalensis is sometimes called pokkiesblom in Afrikaans.

<i>Felicia mossamedensis</i> A plant in the daisy family from southern Africa

Felicia mossamedensis or yellow felicia is a well-branched, roughly hairy, annual or perennial plant of up to 30 cm (1 ft) high, assigned to the family Asteraceae. It has alternately arranged, seated, flat to slightly succulent, broad-based, entire, blunt tipped leaves. The flower heads sit individually on top of a stalk of up to 8 cm (3 in) long, have an involucre of three whorls of bracts, many yellow ray florets and many yellow disk florets. It can be found in southern Africa, in Zimbabwe, Mozambique, Botswana, Eswatini, South Africa and on the coast of Angola.

Felicia smaragdina is an annual, bristly and glandular, much branched plant of up to 40 cm high, that has been assigned to the family Asteraceae. It has seated, slightly succulent, line-shaped leaves of up to 3 cm long and about 1 mm (0.04 in) wide. Its flower heads sit individually at the tip of the branches, and contain about twenty yellow ray florets of about 8 mm long and 112 mm (0.06 in) wide, surrounding many yellow disc florets. A unique character is that when dried, the florets become greenish. The species is an endemic species of Namibia.

<i>Felicia tenella</i> A annual or biennial plant in the daisy family from South Africa

Felicia tenella is an annual, sometimes biennial, herbaceous plant that may be slightly woody at its base, of 5–70 cm tall, that is assigned to the family Asteraceae. The species is very variable in size and hairiness. Its branches may be erect or ascending, and the leaves are narrowly line-shaped, 2–5 cm long and about 1 mm (0.04 in) wide. The leaves have a callous tip, lack visible nerves, and are mostly rigidly ciliate. The flower heads sit individually at the tip of stalks, have an involucre of three whorls of bracts, and about thirty light blue ray florets surrounding many yellow disc florets. Four subspecies are recognised. The species naturally occurs in the Northern Cape and Western Cape provinces of South Africa.

References

  1. "Mairia coriacea Bolus". The Plantlist.
  2. 1 2 3 4 "Mairia coriacea". Fernkloof Nature Reserve.
  3. 1 2 3 4 5 6 7 Herman, P.P.J.; Zinnecker-Wiegand, U. (2016). "A taxonomic revision of the genus Mairia (Asteraceae, Astereae) in South Africa". South African Journal of Botany. 105: 45–49.
  4. "Mairia coriacea Bolus". The PlantList.
  5. Manning, John; Goldblatt, Peter (2012). "Plants of the Greater Cape Floristic Region 1: the Core Cape flora" (PDF). Strelitzia. Pretoria: South African National Biodiversity Institute. 29: 393.
  6. 1 2 "Mairia coriacea". SANBI Red List of South African Plants.