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Thistle
Thistle is the common name of a group of flowering plants characterised by leaves with sharp prickles on the margins, mostly in the family Asteraceae. Prickles can also occur all over the planton the stem and on the flat parts of the leaves. These prickles are an adaptation that protects the plant from being eaten by herbivores. Typically, an involucre with a clasping shape similar to a cup or urn subtends each of a thistle's flower heads. The comparative amount of spininess varies dramatically by species. For example, ''Cirsium heterophyllum'' has minimal spininess while '' Cirsium spinosissimum'' is the opposite. Typically, species adapted to dry environments have greater spininess. The term thistle is sometimes taken to mean precisely those plants in the tribe Cardueae (synonym: Cynareae), especially the genera '' Carduus'', '' Cirsium'', and '' Onopordum''. However, plants outside this tribe are sometimes called thistles. Biennial thistles are particularly notewor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cirsium
''Cirsium'' is a genus of perennial and biennial flowering plants in the Asteraceae, one of several genera known commonly as thistles. They are more precisely known as plume thistles. These differ from other thistle genera (''Carduus'', '' Silybum'' and '' Onopordum'') in having feathered hairs to their achenes. The other genera have a pappus of simple unbranched hairs. They are mostly native to Eurasia and northern Africa, with about 60 species from North America (although several species have been introduced outside their native ranges). Thistles are known for their effusive flower heads, usually purple, rose or pink, also yellow or white. The radially symmetrical disc flowers are at the end of the branches and are visited by many kinds of insects, featuring a generalised pollination syndrome. They have erect stems and prickly leaves, with a characteristic enlarged base of the flower which is commonly spiny. The leaves are alternate, and some species can be slightly hairy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MILK THISTLE
''Silybum marianum'' is a species of thistle. It has various common names including milk thistle, blessed milkthistle, Marian thistle, Mary thistle, Saint Mary's thistle, Mediterranean milk thistle, variegated thistle and Scotch thistle (though not to be confused with ''Onopordum acanthium'' or ''Cirsium vulgare''). This species is an annual or biennial plant of the family Asteraceae. This fairly typical thistle has red to purple flowers and shiny pale green leaves with white veins. Originally a native of Southern Europe through to Asia, it is now found throughout the world. Description Milk thistle is an upright herb that can grow to be tall and has an overall conical shape. The approximate maximum base diameter is . The stem is grooved and may be covered in a light cottony fuzz. The largest specimens have hollow stems. The leaves are oblong to lanceolate and 15–60 cm long and typically pinnately lobed, with spiny edges like most thistles. They are hairless, shiny ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centaurea
''Centaurea'' () is a genus of over 700 species of herbaceous thistle-like flowering plants in the family Asteraceae. Members of the genus are found only north of the equator, mostly in the Eastern Hemisphere; the Middle East and surrounding regions are particularly species-rich. In the western United States, yellow starthistles are an invasive species. Around the year 1850, seeds from the plant had arrived to the state of California. It is believed that those seeds came from South America. Common names Common names for this genus are centaury, centory, starthistles, knapweeds, centaureas and the more ambiguous "bluets"; a vernacular name used for these plants in parts of England is "loggerheads" ( common knapweed). The ''Plectocephalus'' group – possibly a distinct genus – is known as basketflowers. "Cornflower" is used for a few species, but that term more often specifically means either '' C. cyanus'' (the annual cornflower) or '' Centaurea montana'' (the perennial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carduus
''Carduus'' is a genus of flowering plants in the family Asteraceae, and the tribe Cardueae, one of two genera considered to be true thistles, the other being '' Cirsium''. Plants of the genus are known commonly as plumeless thistles.''Carduus''. Integrated Taxonomic Information System (ITIS).''Carduus''. Flora of North America. They are native to Eurasia and Africa, and several are known elsewhere as . This genus is noted for its disproportionately high number of [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Onopordum
''Onopordum'', or cottonthistle, is a genus of plants in the tribe Cardueae within the family Asteraceae. They are native to southern Europe, northern Africa, the Canary Islands, the Caucasus, and southwest and central Asia. They grow on disturbed land, roadsides, arable land and pastures. They are biennials (rarely short-lived perennials) with branched, spinose winged stems, growing 0.5–3 m tall. In the first season they form a basal rosette of gray-green felted leaves and rarely a few flower heads. In the second season they grow rapidly to their final height, flowering extensively, and then die off after seed maturation. The leaves are dentate or shallowly lobed to compound with several pinnatifid or deeply cut leaflets, and strongly spiny. The terminal flower head is typical for thistles, a semi-spherical to ovoid capitulum with purple (seldom white or pink) disc florets. There are no ray florets. The receptacle is glabrous with dentate margins. The tube of the coroll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cnicus
''Cnicus benedictus'', known by the common names St. Benedict's thistle, blessed thistle, holy thistle and spotted thistle, is a thistle-like plant in the family Asteraceae, native to the Mediterranean region, from Portugal north to southern France and east to Iran. It is known in other parts of the world, including parts of North America, as an introduced species and often a noxious weed. It is the sole species in the monotypic genus ''Cnicus''. Other species once included in the genus have largely been reclassified to ''Cirsium'', ''Carduus'', and ''Centaurea''. The related genus '' Notobasis'' is included in ''Cnicus'' by some botanists; it differs in slender, much spinier leaves, and purple flowers. Growth It is an annual plant growing to 60 cm tall, with leathery, hairy leaves up to 30 cm long and 8 cm broad, with small spines on the margins. The flowers are yellow, produced in a dense flowerhead (capitulum) 3–4 cm diameter, surrounded by numerou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carlina
''Carlina'' is a genus of flowering plants in the family Asteraceae. It is distributed from Madeira and the Canary Islands across Europe and northern Africa to Siberia and northwestern China.Kovanda, M. (2002)Observations on ''Carlina biebersteinii''.''Thaiszia Journal of Botany'' 12(1), 75-82. Plants of the genus are known commonly as carline thistles.''Carlina''. In: Greuter, W. & E. von Raab-Straube. (Eds.) Compositae. Euro+Med Plantbase. Description ''Carlina'' species are very similar to true thistles (genus '''') in ,[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cynara
''Cynara'' is a genus of thistle-like perennial plants in the family Asteraceae. They are native to the Mediterranean region, the Middle East, northwestern Africa, and the Canary Islands. The genus name comes from the Greek ''kynara'', which means "artichoke".''Cynara''. Flora of North America. Among the better known species in this genus include: * '''' is the cardoon, artichoke thistle, or wild artichoke. The stems of cultivated varieties are used as food around the Mediterranean. It is a common source of a coagulant used as an alternative to rennet in the manufacture of [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Floral Emblem
In a number of countries, plants have been chosen as symbols to represent specific geographic areas. Some countries have a country-wide floral emblem; others in addition have symbols representing subdivisions. Different processes have been used to adopt these symbols – some are conferred by government bodies, whereas others are the result of informal public polls. The term floral emblem, which refers to flowers specifically, is primarily used in Australia and Canada. In the United States, the term state flower is more often used. National plants Africa Mauritius The national flower of Mauritius is '' Trochetia boutoniana''. Seychelles The national flower of the Seychelles is the tropicbird orchid (known locally as ''orkid payanke''), '' Angraecum eburneum''. South Africa The national flower of South Africa is the King Protea, ''Protea cynaroides''. Tunisia The national flower of Tunisia is jasmine. It was chosen as a symbol for the 2010 Tunisian Revolution. Asia Ban ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cirsium Heterophyllum
''Cirsium heterophyllum'', the melancholy thistle, is an erect spineless herbaceous perennial flowering plant in the family Asteraceae. It is native to Europe and western Asia, where it grows in upland meadows, grasslands, road verges and open woodland. Description Unusually for a thistle, ''Cirsium heterophyllum'' lacks spines. Growing tall, the plant forms creeping stolons (runners). The stem is grooved but unwinged, more-or-less branchless, and cottony. The leaves are green and hairless above, thick white-felted underneath. The basal leaves are lanceolate with petioles and softly prickly edges, and grow long, and wide. The upper leaves do not have petioles, clasping the stem with cordate (heart-shaped) bases. The flower heads are 3 to 5 cm long and wide, the flowers red-purple, appearing from July to August. Distribution ''Cirsium heterophyllum'' is a species of northern Europe and Central Asia. It is native in upland areas of Scotland and northern England an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carthamus
The genus ''Carthamus'', the distaff thistles, includes plants in the family Asteraceae. The group is native to Europe, North Africa, and parts of Asia. The flower has been used since ancient times in the Philippines, which it has been called ''kasubha'' by the Tagalog people. The best known species is the safflower ''(Carthamus tinctorius Safflower (''Carthamus tinctorius'') is a highly branched, herbaceous, thistle-like annual plant in the family Asteraceae. It is commercially cultivated for vegetable oil extracted from the seeds and was used by the early Spanish colonies along ...).'' ; Species References External links Jepson Manual Treatment* * Asteraceae genera {{Cynareae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Encyclopædia Britannica
The (Latin for "British Encyclopædia") is a general knowledge English-language encyclopaedia. It is published by Encyclopædia Britannica, Inc.; the company has existed since the 18th century, although it has changed ownership various times through the centuries. The encyclopaedia is maintained by about 100 full-time editors and more than 4,000 contributors. The 2010 version of the 15th edition, which spans 32 volumes and 32,640 pages, was the last printed edition. Since 2016, it has been published exclusively as an online encyclopaedia. Printed for 244 years, the ''Britannica'' was the longest running in-print encyclopaedia in the English language. It was first published between 1768 and 1771 in the Scottish capital of Edinburgh, as three volumes. The encyclopaedia grew in size: the second edition was 10 volumes, and by its fourth edition (1801–1810) it had expanded to 20 volumes. Its rising stature as a scholarly work helped recruit eminent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
