Oedera capensis

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Oedera capensis
Oedera capensis Betty's Bay 02.jpg
Oedera capensis
Oedera capensis Hanklip 05.jpg
Composite flowerheads
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Oedera
Species:
O. capensis
Binomial name
Oedera capensis
Synonyms [1]
  • Buphthalmum capense
  • Eroeda capensis
  • Oedera prolifera

Oedera capensis is a prickly shrublet belonging to the family Asteraceae. It has stems that branch only at the foot and are densely set over their entire length with narrowly triangular leathery leaves with a sharp tip at approximately right angles to the stem. At their tip are what at first sight appears to be a single flowerhead with yellow ray florets and yellow disc florets. In fact, these are mostly nine densely cropped heads, as is suggested by the nine domes of the "disc" of the composite head, the untidy arrangement of the ray florets, and becomes very clear when cutting through the composite head. [2] It is an endemic of the south of the Western Cape province in South Africa.

Contents

Description

Oedera capensis is a prickly, sprawling shrublet of about 25 cm (9.8 in) high, that produces between two and six branches below the flower heads of the previous season. Stems are densely and alternately set with mostly hairless, erect to recurved, flat, leathery, narrow triangular leaves 5–25 mm (0.20–0.98 in) long and 2–6 mm (0.079–0.236 in), with glands and silky hairs along the edges. Usually nine (rarely ten or eleven) flower heads are cropped at the tip of the branches in what seems at first sight a single flower head of mostly 20–25 mm (0.79–0.98 in) in diameter. The central head consists of yolk yellow disc florets only, while the remainder has disc florets and in addition a row of yolk yellow ray florets, burgundy on the reverse, where they do not touch the other heads. A cluster of cropped heads usually has 30 to 40 ray florets. A few shorter ray florets sometimes occur where the heads touch. The involucre that surrounds the cropped heads consist of several whorls of green, leaf-like bracts of usually 2–3 mm (0.079–0.118 in) wide, lanceolate, widest at midlength and with a prominent rib along the midline. The inner row of bracts surrounding the cropped heads have dense, silky hair in the lower part of their edges. The involucral bracts between the individual heads are thin and papery. The pappus consists of a circle of scales around the tip of the cypselas. Flowering usually appears from June to September, rarely extending to December. [1] This species has seven sets of homologue chromosomes (2n=14). [3]

Differences with other species

Oedera imbricata has bright yellow flower heads, not yolk yellow. [1]

Taxonomy

Carl Linnaeus, a Swedish naturalist famous for his introduction of the binominal nomenclature, first described the plant in 1759 as Buphthalmum capense. His son, Carl Linnaeus the Younger later described Oedera prolifera. In 1914, George Claridge Druce reassigned the species, creating the new combination Oedera capensis. South African botanist Margaret Levyns thought Oedera should be split up and she reassigned the species in 1948 to her new genus Eroeda, creating the new combination E. capensis. All of these names are now considered synonymous. [4] The species name capensis refers to the Cape of Good Hope. [1]

Distribution and habitat

Oedera capensis grows on dry stony slopes and flats, roadsides and sandy areas from Albertinia to the Cape Peninsula. [1]

Ecology

In an experiment, 20% of the cypselas germinated after exposure to smoke, while without smoke only 5% sprouted. [5]

Related Research Articles

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

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Felicia cana is a low and slender shrublet of up to 15 cm high, covered in white felty hairs, that is assigned to the family Asteraceae. It has alternately arranged leaves, and flower heads of about 16 mm (0.63 in) across, with 3–4 whorls of involucral bracts, and about 20 blue purple ray florets, surrounding many yellow disc florets in the centre. Very characteristic for the species are also the middle-long hairs with forked tips on the surface of its fruits. It is an endemic species that is restricted to a zone along the southern coast of the Western Cape province of South Africa.

<i>Oedera imbricata</i> A shrublet in the daisy family from South Africa

Oedera imbricata is a prickly shrublet belonging to the family Asteraceae.

<i>Felicia</i> (plant) Genus of shrublets, perennials and annuals in the daisy family

Felicia is a genus of small shrubs, perennial or annual herbaceous plants, with 85 known species, that is assigned to the daisy family. Like in almost all Asteraceae, the individual flowers are 5-merous, small and clustered in typical heads, and which are surrounded by an involucre of, in this case between two and four whorls of, bracts. In Felicia, the centre of the head is taken by yellow, seldom whitish or blackish blue disc florets, and is almost always surrounded by one single whorl of mostly purple, sometimes blue, pink, white or yellow ligulate florets and rarely ligulate florets are absent. These florets sit on a common base and are not individually subtended by a bract. Most species occur in the Cape Floristic Region, which is most probably the area where the genus originates and had most of its development. Some species can be found in the eastern half of Africa up to Sudan and the south-western Arabian peninsula, while on the west coast species can be found from the Cape to Angola and one species having outposts on the Cameroon-Nigeria border and central Nigeria. Some species of Felicia are cultivated as ornamentals and several hybrids have been developed for that purpose.

References

  1. 1 2 3 4 5 "Oedera capensis". Lucid Central. Retrieved 2018-01-30.
  2. John Manning (2007). Field Guide to Fynbos (illustrated ed.). Struik. p. 444. ISBN   9781770072657.
  3. Bayer, R.J.; Breitwieser, I.; Ward, J.; Puttock, C. (2007). "XIV Tribe Gnaphaliae". In A.A. Anderberg; B.G. Baldwin; R.G. Bayer; et al. (eds.). Flowering Plants. Eudicots: Asterales. The Families and Genera of Vascular Plants. Vol. 8. Springer Science & Business Media. p. 274.
  4. "Oedera capensis". The Plantlist.
  5. Jefferson, Lara; Pennacchio, Marcello; Havens-Young, Kayri (April 2014). Ecology of Plant-Derived Smoke: Its Use in Seed Germination. p. 104. ISBN   978-0-19-975593-6.