Oedera capensis | |
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Oedera capensis | |
Composite flowerheads | |
Scientific classification | |
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] | |
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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.
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]
Oedera imbricata has bright yellow flower heads, not yolk yellow. [1]
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]
Oedera capensis grows on dry stony slopes and flats, roadsides and sandy areas from Albertinia to the Cape Peninsula. [1]
In an experiment, 20% of the cypselas germinated after exposure to smoke, while without smoke only 5% sprouted. [5]
Felicia amelloides, the blue daisy bush or blue felicia, is a hairy, soft, usually perennial, evergreen plant, in the family Asteraceae. It can be found along the southern coast of South Africa. It grows as ground cover and produces many very regular branches. It mostly grows to about 50 cm (1.6 ft) high, rarely to 1 m. The leaves are oppositely arranged along the stems, dark green in colour and elliptic in shape. The flower heads sit individually on up to 18 cm (7 in) long, green to dark reddish stalks. They consist of about twelve heavenly blue ray florets that surround many yellow disc florets, together measuring about 3 cm across. It is also cultivated as an ornamental, and was introduced in Europe in the middle of the 18th century.
Felicia aethiopica is a low shrublet of up to about 50 cm high that is assigned to the family Asteraceae. It has rigid, leathery, inverted egg-shaped leaves, with only the lowest pair set oppositely. It has flower heads with an involucre of about 8 mm in diameter with bracts that each contain three resin ducts, and have one whorl of twelve to fourteen ray florets with about 11 mm long and 1½ mm wide blue straps surrounding many yellow disc florets. The plant is called wild aster or dwarf Felicia in English, and wilde-aster or bloublombossie in Afrikaans. Flowering occurs year-round. Wild aster can be found in the Western and Eastern Cape provinces of South Africa.
Polyarrhena is a genus of low, branching shrublets that is assigned to the daisy family. Its stems are alternately and densely set with entire or somewhat toothed leaves. 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 three whorls of bracts. In Polyarrhena, the centre of the head is taken by yellow disc florets, and is surrounded by one single whorl of white ligulate florets that have a pinkish-purple wash on the underside. These florets sit on a common base and are not individually subtended by a bract. The species occur in the Cape Floristic Region. Polyarrhena reflexa has long been cultivated as an ornamental and is often known under its synonym Aster reflexum.
Gorteria is a genus of small annual herbaceous plants or shrubs, with 8 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 are surrounded by an involucre, consisting of in this case several whorls of bracts, which are merged at their base. In Gorteria, the centre of the head is taken by relatively few bisexual and sometimes also male, yellow to orange disc florets, and is surrounded by one complete whorl of 5–14 infertile cream to dark orange ray florets, sometimes with a few ray florets nearer to the centre. None, some or all of them may have darker spots at their base. The fruits remain attached to their common base when ripe, and it is the entire head that breaks free from the plant. One or few seeds germinate inside the flower head which can be found at the foot of plants during their first year. The species flower between August and October, except for G. warmbadica that blooms mostly in May and June. The species of the genus Gorteria can be found in Namibia and South Africa.
Gorteria diffusa is a highly variable, small annual herbaceous plant or rarely a shrublet 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 are surrounded by an involucre, consisting of in this case several whorls of bracts, which are merged at their base. In G. diffusa, the centre of the head is taken by relatively few male and bisexual yellow to orange disc florets, and is surrounded by one complete whorl of 5–14 infertile cream to dark orange ray florets, sometimes with a few ray florets nearer to the centre. None, some or all of them may have darker spots at their base. The fruits remain attached to their common base when ripe, and it is the entire head that breaks free from the plant. One or few seeds germinate inside the flower head which can be found at the foot of plants during their first year. The species flowers between August and October. It is called beetle daisy in English and katoog in Afrikaans. It can be found in Namibia and South Africa.
Hymenonema laconicum is a species of herbaceous perennial plant in the Asteraceae family. It is small to average height, with a rosette of greyish pinnately segmented leaves, and little branching solid stems carrying one to three heads of orange or yolk yellow ray-flowers, with a purple anther tube, and scaly pappus. The species is an endemic of the central and south-eastern Peloponnesos, and flowers in May and June.
Scolymus grandiflorus is a spiny annual or biennial plant in the family Asteraceae, native to the Mediterranean region. With up to 75 cm high stems, it is the smallest of the species of Scolymus. Its stems are lined with uninterrupted spiny wings. It also has the largest flowerheads in the genus, of approximately 5 cm wide. It has yellow, sometimes yolk-yellow ligulate florets. Its vernacular name in Maltese is xewk isfar kbir, meaning "large yellow fin", cardogna maggiore in Italian, scoddi on Sicily, and scolyme à grandes fleurs in French.
Felicia echinata, commonly known as the dune daisy or prickly felicia, is a species of shrub native to South Africa belonging to the daisy family. It grows to 1 m (3.3 ft) high and bears blue-purple flower heads with yellow central discs. In the wild, it flowers April to October.
Felicia josephinae is a roughly hairy annual herbaceous plant of 15–20 cm (6–8 in) high, that is assigned to the family Asteraceae. It branches near its base, and has few leaves along its stems. The lower leaves are set oppositely, inverted lance-shaped, relatively large at 3–7 cm long and ⅔–1¼ cm wide, and soon withering, while the higher ones are smaller and relatively narrower. In the axils of the leaves grow flower heads of 7–8 mm wide on stalks of up to 5 cm (2.0 in) long, topped with an involucre of about 5 mm (0.20 in) high and 4 mm (0.16 in) wide, consisting of eleven to thirteen bracts in two rows with bristles near the tip, eight to nine white or cream-coloured ligulate florets surrounding fourteen or fifteen deep purple disc florets. Flowers can be found in September and October. The species is an endemic species that can only be found in a small area along the west coast of the Western Cape province of South Africa.
Mairia crenata is a perennial herbaceous plant of mostly 2–15 cm (1–6 in) high that is assigned to the family Asteraceae. It has a woody rootstock of up to 5 cm (2 in) long, from which brown, fleshy roots develop. The five to eighteen, hard and leathery, spoon-shaped leaves are in one to three rosettes, have a distinct main vein, blunt or pointy tip, often dark red or blackish margins with rounded teeth and a ½–2 cm (0.2–0.8 in) long stalk-like foot, often initially somewhat woolly hairy, on particularly the lower surface and the main vein, but this is easily rubbed off the shiny surfaces. Each rosette produces mostly one, sometimes up to four, mostly rusty or whitish woolly hairy, brown or dark red inflorescence stalks, usually 1½–15 cm long, each with two to eight, initially woolly, line-shaped to oval bracts, the lowest up to 3 cm (1.2 in), decreasing size further up, and carrying mostly one, rarely up to three flower heads. The flower heads have a bell-shaped involucre with about 40 bracts, sixteen to thirty three violet to white ray florets of about 1¼–1⅞ cm long, and many yellow disc florets. The species flowers anywhere between February and December but only after a fire has destroyed the overhead biomass or serious disturbance. It is an endemic species that is restricted to the Eastern Cape and Western Cape provinces of South Africa.
Felicia heterophylla is a roughly hairy annual plant in the family Asteraceae. It has alternate leaves of 1–5 cm long with an entire margin or few inconspicuous teeth. The flower heads are set individually at the tip of its stems, and contain a whorl of purplish blue ray florets around a center of blackish blue disk florets. Flower heads appear in winter and spring. It is called true-blue daisy in English and bloublomastertjie in Afrikaans. It is an endemic species that only occurs in the Western Cape province of South Africa.
Felicia canaliculata is a grayish green shrublet in the family Asteraceae that grows up to 40 cm (16 in) in height. It has narrow, awl-shaped leaves, relatively large flower heads with approximately a dozen light purple to white ray florets encircling many yellow disc florets. It can only be found in the Western Cape province of 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.
Felicia nordenstamii is a flowering shrub in the family Asteraceae. It is found only in South Africa where it grows on limestone hills close to the sea on the southern coast. Felicia nordenstamii is a many-branched shrub growing up to 30 cm (1 ft) tall. The lower parts of the stems are covered in grayish brown bark and the upper stem has many crowded, upwardly angled, alternate leaves with long hairs on the lower surfaces. Large flower heads form at the tips of the branches, each about 41⁄2 cm across, with about thirty purplish blue ray florets surrounding many yellow disc florets.
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.
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.
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.
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.
Oedera imbricata is a prickly shrublet belonging to the family Asteraceae.
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.