Dicoma swazilandica

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Dicoma swazilandica
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Dicoma
Species:
D. swazilandica
Binomial name
Dicoma swazilandica
S.Ortiz, Rodr.Oubiña & Pulgar

Dicoma swazilandica is a species of plant from Eswatini and South Africa.

Contents

Description

Growth form

This herb grows to be up to 63 cm (25 in) tall. It has an erect, straited stem covered with simple white hairs and yellow glands. [1]

Leaves

The leaves are erect and linear, ranging in size from 2–17 mm (0.079–0.669 in) wide and 40–110 mm (1.6–4.3 in) long. Te margins are finely toothed. The upper surface is greenish and often has yellow glands. It may have hairs or be hairless. The lower surface is densely hairy and has glands. [1]

Flowers

The flowers are borne in typical daisy-like flowerheads. They are borne on erect stalks that may be surrounded by linear leaves. The surrounding whorls of bracts form an inverted cone shape. They grow in five or six )or sometimes seven) rows. They are straw coloured with a purple stripe on the midrib. The margins are finely serrated, especially towards the tips. The innermost bracts are longer than the outer ones and extend about 1–2 mm (0.039–0.079 in) beyond the pappus. [1]

Each flowerhead contains about 25 florets. They are radially symmetrical and hermaphroditic. The corolla is a dull white in colour and has subepidermal star-shaped calcium oxalate crystals. The epidermal cells have short, glandular twin hairs. The stamens protrude slightly beyond the corolla. The filaments, like the corolla, have star-shaped calcium oxalate crystals. The style also has similar crystals. The stylar branches have sweeping hairs that form a subapical ring. The basal hairs are the longest. [1]

Fruits and seeds

The rough achenes (dry fruits, each containing a single seed) are covered in ten ribs with hairs growing between them. [1]

Similar species

This species is most similar to Dicoma anomola . It does, however, differ in several characteristics: [2]

Distribution and habitat

This species is found in Eswatini and in the Mpumalanga province of South Africa. It grows on stony hills at an altitude of about 1,685 m (5,528 ft) in grasslands and savannas. [3]

Conservation

This species is potentially threatened by plantations in Eswatini but occurs in a protected area in South Africa, and as such, is currently not threatened there. [3]

Related Research Articles

<span class="mw-page-title-main">Calyceraceae</span> Family of flowering plants

Calyceraceae is a plant family in the order Asterales. The natural distribution of the about sixty species belonging to this family is restricted to the southern half of South America. The species of the family resemble both the family Asteraceae and the Dipsacaceae.

<i>Phaneroglossa</i> Plant from the daisy family from South Africa

Phaneroglossa is a genus of plants that is assigned to the daisy family. It consists of only one species, Phaneroglossa bolusii, a perennial plant of up to 40 cm high, that has leathery, line- to lance-shaped, seated leaves with mostly few shallow teeth and flower heads set individually on top of long stalks. The flower head has an involucre of just one whorl of bracts, few elliptic, white or cream ray florets, and many yellow disc florets. It is an endemic species of the Western Cape province of South Africa. Flowering mainly occurs from November to January.

Catananche lutea, is a woolly annual plant, in the family Asteraceae, with most leaves in a basal rosette, and some smaller leaves on the stems at the base of the branches. Seated horizontal flowerheads develop early on under the rosette leaves. Later, not or sparingly branching erect stems grow to 8–40 cm high, carrying solitary flowerheads at their tips with a papery involucre whitish to beige, reaching beyond the yellow ligulate florets. Flowers are present between April and June. This plant is unique for the five different types of seed it develops, few larger seeds from the basal flowerheads, which remain in the soil, and smaller seeds from the flowerheads above ground that may be spread by the wind or remain in the flowerhead when it breaks from the dead plant. This phenomenon is known as amphicarpy. The seeds germinate immediately, but in one type, germination is postponed. It naturally occurs around the Mediterranean. Sources in English sometimes refer to this species as yellow succory.

<i>Felicia macrorrhiza</i> A shrublet in the daisy family from South Africa

Felicia macrorrhiza is a small, evergreen shrub in the family Asteraceae. This species grows in the Karoo region of South Africa. It is called Aspoestertjie in Afrikaans.

<i>Felicia dregei</i> A shrublet in the daisy family from South Africa

Felicia dregei is an evergreen, glandular shrub of up to 112 m (5 ft) high, that is assigned to the family Asteraceae. It has flat, finely felty, grayish green, narrowly elliptic to lance-shaped leaves of up to 4 cm long and 8 mm wide, with an entire margin or here and there with up to ten teeth. The flower heads have about ten violet ray florets, encircling many yellow disc florets. This species grows in the Northern Cape and Western Cape provinces of 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.

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

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. It can be found in the southern mountains of South Africa's Western Cape province. It is called leather leaves in English.

<i>Felicia bellidioides</i> A perennial plant in the daisy family from South Africa

Felicia bellidioides is a perennial plant of up to about 25 cm (10 in) high, that is assigned to the family Asteraceae. Most of the narrowly inverted egg-shaped leaves are silky hairy and in a basal rosette with no or few very narrow bracts on the stalk in the subspecies bellidioides. In the subspecies foliosa, the narrower leaves are not silky hairy but variously bristly and glandular, with more and larger bracts on the inflorescence stalk. The flowerheads sit individually on top of a long peduncle and consist of an involucre with only two worls of bracts, about twenty purplish blue ray florets, surrounding many yellow disc florets. It occurs in the Western Cape province of South Africa.

Felicia annectens is an annual plant of up to about 25 cm (10 in) high, that is assigned to the family Asteraceae. The lower leaves are opposite and the higher leaves alternate. The bloated involucre consists of very broad, hairless bracts. These protect up to ten, short, bluish ray florets that encircle yellow, partly sterile disc florets. The heads sit individually on top of up to 6 cm long stalks. The species was considered extinct after no observations were made after 1915, but was rediscovered in the 21st century. It occurs in the Western Cape province of South Africa.

Felicia westae is a sparsely branched shrub growing up to 40 cm tall, that is assigned to the family Asteraceae. The lower parts of the stems have lost their leaves and the upper part has many crowded, upwardly angled and curved, alternate leaves pressed against the stem, with the edges curled inward. The flower heads form at the tips of the branches, each about 313 cm across, with about twenty purplish blue ray florets surrounding many yellow disc florets. It is only known from a small area in the Eastern Cape province of South Africa.

<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 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>Helichrysum splendidum</i> Species of flowering plant

Helichrysum splendidum is a species of flowering plant in the family Asteraceae, found in Africa and Yemen A hardy evergreen perennial, it occurs from the Southern Cape to Ethiopia along the eastern escarpment mountains, favouring rocky places in fynbos, grassland and savanna biomes. It forms mound-shaped aggregations 1–2 meters high, sometimes covering entire hillsides. The species is found in South Africa, Eswatini, Lesotho, Tanzania, Ethiopia, South Sudan, Malawi, Zimbabwe, Zambia and Yemen. The distribution of this species is clearly anthropogenic, that is, closely linked to the movements of man through the ages.

<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.

<i>Otholobium saxosum</i> Shrublet in the family Fabaceae from South Africa

Otholobium saxosum is a small shrublet of up to 20 cm (7.9 in) high that has been assigned to the Pea family, with branches upright or horizontal at the base with rising tips. It has sessile, clover-like leaves and white, pea-like flowers that grow in triplets in the axils of the upper leaves of new, short side shoots. The species is only known from Garcia's Pass, Western Cape province of South Africa. Flowering occurs in October and November.

Jeffreycia is a genus of African flowering plants in the family Asteraceae. They are in the tribe Vernonieae.

Osteospermum burttianum is a species of plant from South Africa.

Schistostephium griseum is a species of plant from southern Africa.

References

  1. 1 2 3 4 5 e-Flora of South Africa. v1.36. 2022. South African National Biodiversity Institute. http://ipt.sanbi.org.za/iptsanbi/resource?r=flora_descriptions&v=1.36
  2. Ortiz, Santiago; Pulgar, Iñigo (2000). "A new species of Dicoma (Asteraceae-Mutisieae) from Swaziland". Nordic Journal of Botany. 20 (3): 347–352. doi:10.1111/j.1756-1051.2000.tb00748.x. ISSN   0107-055X.
  3. 1 2 von Staden, L. & Kamundi, D.A. 2016. Dicoma swazilandica S.Ortíz, Rodr.Oubiña & Pulgar. National Assessment: Red List of South African Plants version 2020.1. Accessed on 23 February 2023