Hymenonema

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Hymenonema
Hymenonema graecum.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Subfamily: Cichorioideae
Tribe: Cichorieae
Subtribe: Scolyminae
Genus: Hymenonema
Cass.
Type species
Catananche graeca
L.
Species

Hymenonema is a genus of flowering plants in the family Asteraceae endemic to Greece. On each of the single or few stems, the species have one to three flowerheads consisting of yellow or yolk yellow ligulate florets, scaly pappus, greyish, pinnately segmented leaves in a basal rosette, and few smaller leaves on the 20–70 cm high stems. It contains two species: Hymenonema graecum , that is known from the Cyclades, and Hymenonema laconicum , which occurs in the central and south-eastern Peloponnesos. [1]

Contents

Description

Both Hymenonema species are herbaceous perennial plants, with short glandular hairs, and a basal rosettes of pinnately segmented leaves that appears greyish due to longer hairs without glands that are pressed to the leaf surfaces. Plants may have one or few solid stems with zero to two branches, carrying few smaller leaves, the lowest pinnately segmented, and the higher increasingly simple, small and narrow. Each branch carries one flowerhead at its tip. The flowerhead consist of several overlapping rows of involucral bracts, with papery margins. The common base of the florets (or receptacle) is pitted, and carries scales near its margin. The ligulate florets are yellow and have five triangular teeth at their tip. The fruits (or cypselas) are five-angled and carry few or many rigid, appressed hairs. The cypselas are topped by the changed calyx called pappus, which consists of rigid hairs and scales in 2-3 rows, or sometimes only of scales. [2]

Taxonomy

The earliest species that is now assigned to Hymenonema was from the Cyclades and described in 1753 by Carl Linnaeus as Catananche graeca. In 1817 Henri Cassini described Hymenonema tournefortii, which is now considered a synonym of Catananche graecaL.. In 1838 Augustin Pyramus de Candolle considered C. graeca was too deviant to remain in Catananche and moved the species to Cassini's genus, recombining it with Linnaeus' epithet to Hymenonema graecum. Also in 1838, Jean Baptiste Bory de Saint-Vincent and Louis Athanase Chaubard in their Nouvelle Flore du Péloponèse et des Cyclades described Catananche graeca, but now based on a specimen from the Peloponnesos. Pierre Edmond Boissier and Theodor von Heldreich realised that the plants described by Linnaeus and by Bory and Chaubard, belonged to related but different species, therefore the last assigned name was no longer available, and hence invalid. They proposed a new name for it, Hymenonema laconium, which they published in 1875. [3] [4]

Phylogeny

According to recent genetic analyses, the genus Hymenonema is related to the genera Scolymus , Catananche and Gundelia . The latest common ancestor of both Hymenonema species is calculated to have occurred roughly 1.3 million years ago during the earlier Pleistocene. This results in the following relationship tree. [5]

subtribe Scolyminae

Etymology

Hymenonema is the contraction of the Latin hymen, meaning "membrane", and nema, a word for "thread", "cloth", "weft", probably indicating the plant has membranous margins to the involucral bracts, or the receptacular bracts (or paleas), or the branches of the style.

Distribution and habitat

Hymenonema graecum is only known from the Cyclades and doubtfully from western Crete. It grows on rocky soils, under scrubs, in dry meadows, along roads and at the seaside. [6] H. laconicum is limited to the central and south-eastern Peloponnesos, in particular the Mainalo, Parnon and Taygetos mountains and the surrounding lowlands. It grows at altitudes of 5–1300 m in shrubland on stony soils, field margins and meadows. [7]

Related Research Articles

<i>Gundelia</i> Genus of flowering plants

Gundelia or tumble thistle is a low to high (20–100 cm) thistle-like perennial herbaceous plant with latex, spiny compound inflorescences, reminiscent of teasles and eryngos, that contain cream, yellow, greenish, pink, purple or redish-purple disk florets. It is assigned to the family Asteraceae. Flowers can be found from February to May. The stems of this plant dry-out when the seeds are ripe and break free from the underground root, and are then blown away like a tumbleweed, thus spreading the seeds effectively over large areas with little standing vegetation. This plant is native to the eastern Mediterranean and the Middle-East. Opinions differ about the number of species in Gundelia. Sometimes the genus is regarded monotypic, Gundelia tournefortii being a species with a large variability, but other authors distinguish up to nine species, differing in floret color and pubescence. Young stems are cooked and eaten in the Middle-East and are said to taste like a combination of artichoke and asparagus.

<i>Scolymus</i> Genus of flowering plants

Scolymus is a genus of annual, biennial or perennial, herbaceous plants that is assigned to the family Asteraceae, and can be found in Macaronesia, around the Mediterranean, and in the Middle East. All species are spiny, thistle-like in appearance, with flowerheads that consist of yellow ligulate florets, and canals that contain latex. It is sometimes called golden thistle or oyster thistle, and is known as سكوليمس (skwlyms) in Arabic and scolyme in French.

<i>Scolymus maculatus</i> Species of flowering plant

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<i>Lapsana communis</i> Species of flowering plant in the family Asteraceae

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<i>Catananche caerulea</i> Species of flowering plant

Catananche caerulea, or Cupid's dart, is a greyish green perennial herbaceous plant with a basal leaf rosette and conspicuous blue-purple or sometimes white flowerheads, belonging to the daisy family. It is a popular garden plant and is often used in dried flower arrangements.

<i>Helminthotheca echioides</i> Species of flowering plant

Helminthotheca echioides, known as bristlyoxtongue, is a sprawling annual or biennial herb native to Europe and North Africa. It was originally placed within the genus Picris but is often separated within the small genus Helminthotheca alongside a few other plants which also have the distinctive outer row of bracts around the flowerheads. It is a ruderal plant, found on waste ground and agricultural soils around the world, and in some places it is considered a troublesome weed.

<i>Polyarrhena</i> Genus of plants

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.

<i>Didelta</i> Plant genus in the Asteraceae from Southern Africa

Didelta is a genus of shrubs of up to 1 or 2 meter high, with two known species in 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 two whorls of bracts, which are almost free from each other. The 3–5 outer bracts are protruding and triangular in shape, the inner about twice as many are lance-shaped and ascending. In Didelta, the centre of the head is taken by 3–5 clusters of bisexual yolk yellow disc florets, sometimes divided from each other by male disc florets, and is surrounded by one complete whorl of infertile yolk yellow ray florets. The common base of the flowerhead swells around the developing fruitlets, become woody and breaks into segments when ripe. The fruitlets germinate within this woody encasing. The species of the genus Didelta can be found in Namibia and South Africa. The genus is called salad thistle in English and slaaibos in Afrikaans.

<i>Gymnarrhena</i> Genus of flowering plants

Gymnarrhena is a deviant genus of plants in the family Asteraceae, with only one known species, Gymnarrhena micrantha. It is native to North Africa and the Middle East, as far east as Balochistan. Together with the very different Cavea tanguensis it constitutes the tribe Gymnarrheneae, and in the subfamily Gymnarrhenoideae.

<i>Warionia</i> Genus of flowering plants

Warionia is a genus in the tribe Cichorieae within the family Asteraceae. The only known species is Warionia saharae, an endemic of Algeria and Morocco, and it is locally known in the Berber language as afessas, abessas or tazart n-îfiss. It is an aromatic, thistle-like shrub of ½–2 m high, that contains a white latex, and has fleshy, pinnately divided, wavy leaves. It is not thorny or prickly. The aggregate flower heads contain yellow disk florets. It flowers from April till June. Because Warionia is deviant in many respects from any other Asteraceae, different scholars have placed it hesitantly in the Cardueae, Gundelieae, Mutisieae, but now genetic analysis positions it as the sister group to all other Cichorieae.

<i>Hymenonema graecum</i> Species of flowering plant

Hymenonema graecum is a perennial herbaceous plant of 20–70 cm, that rests with its buds at or just under the surface of the soil. The Greek vernacular name is Αδραλίδα (Adralida), meaning "handsome Lida". The leaves are pinnate, and may be up to 1 cm wide. The ligulate flowers are yellow. The species is an endemic of Greece.

<i>Hymenonema laconicum</i> Species of plant in the family Asteraceae

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.

<i>Scolymus grandiflorus</i> Species of flowering plant

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.

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 echinata</i> Shrublet in the daisy family from South Africa

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.

<i>Oedera capensis</i> Shrublet in the daisy family from South Africa

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. It is an endemic of the south of the Western Cape province in South Africa.

<i>Felicia josephinae</i> An annual plant in the daisy family from South Africa

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.

<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.

<i>Senecio quadridentatus</i> Species of flowering plant

Senecio quadridentatus is native to Australia and New Zealand. In New Zealand it is known by its Māori name pahokoraka or pekapeka. Senecio quadridentatus is an annual or perennial herbaceous flowering plant in the family Asteraceae. It is also known as Erechtites quadridentata Labill by the synonyms.

<i>Taraxacum ceratophorum</i> Species of flowering plant

Taraxacum ceratophorum, also known as the horned dandelion, is a species of flowering plant within the genus Taraxacum and family Asteraceae. This alpine species has a preference for mountainous habitat, where it can be found growing at elevations up to 3000 meters above sea level. It is native to a large portion of the Northern Hemisphere, inhabiting various countries within Asia, Europe and North America.

References

  1. Dimopoulos, P.; Raus, Th.; Bergmeier, E.; Constantinidis, Th.; Iatrou, G.; Kokkini, S.; Strid, A.; Tzanoudakis, D. (2013). Vascular plants of Greece: An annotated checklist. Berlin/Athens: Botanic Garden and Botanical Museum Berlin-Dahlem/Hellenic Botanical Society. p. 372. ISBN   978-960-98543-1-3.
  2. "Hymenonema". Cichorieae Portal. Retrieved 2016-11-16.
  3. "Hymenonema laconium". The Plantlist. Retrieved 2016-11-09.
  4. Cassini, Henri (1817). "Hymenonema tournefortii". Bulletin des Sciences, par la Société Philomatique: 121. hosted on "121" (PDF). Digital Library of the Real Jardín Botánico of Madrid. Retrieved 2016-11-09.
  5. Liveri, Eleni; Tomasello, Salvatore; Oberprieler, Christoph; Kamari, Georgia (June 2016), Cytological and phylogenetic study of the Greek endemic genus Hymenonema Cass. (Cichorieae, Compositae) , retrieved 2016-11-09
  6. "Hymenonema graecum (L.) DC". Χλωρίδα της Σύρου [Flora Syros]. Retrieved 2016-11-07.
  7. "Hymenonema laconicum". Greek Flora. Retrieved 2016-11-09.