Overview
Interesting Facts
Common Names
Click on the language to view common names.
Common Names in English:
Mountain Bluet, Mountain Cornflower, Mountain Knapweed, Mountain Starthistle, Mountain-Bluet, Perennial Cornflower
Common Names in French:
Centaurée Des Montagnes
Common Names in German:
Berg-Flockenblume
Description
Family Compositae
The largest family of flowering plants , the Compositae (Asteraceae), comprising about 1,100 genera and more than 20,000 species and characterized by many small flowers arranged in a head looking like a single flower and subtended by an involucre of bracts. A head may consist of both ray flowers and disk flowers, as in the sunflower, of disk flowers only, as in the burdock, or of ray flowers only, as in the dandelion.
Genus Centaurea
Annuals
, biennials, or perennials, 20-300 cm, glabrous
or tomentose
. Stems erect
, ascending
, or spreading
, simple
or branched. Leaves basal and cauline; petiolate
or sessile; proximal
blade
margins
often ± deeply lobed
, (spiny
in C. benedicta ), distal ± smaller, often entire, faces
glabrous or ± tomentose, sometimes also villous
, strigose
, or puberulent
, often glandular-punctate. Heads discoid
, disciform
, or radiant, borne singly or in corymbiform
arrays. Involucres cylindric
or ovoid
to hemispheric
. Phyllaries many in 6-many series, unequal, proximal part appressed
, body margins entire. distal parts expanded into erect to spreading, usually ± dentate
or fringed
, linear
to ovate
appendages
, spine. tipped or spineless. Receptacles flat, epaleate, bristly
. Florets 10-many; outer usually sterile
, corollas slender and inconspicuous to much expanded, ± bilateral
; inner fertile
, corollas white to blue, pink, purple, or yellow, bilateral or radial
, often bent at junction of tubes
and throats
, lobes
linear-oblong, acute; anther
bases
tailed
, apical appendages oblong
; style branches: fused portions with minutely hairy
nodes, distinct
portions minute. Cypselae ± barrel-shaped, ± compressed
, smooth
or ribbed
, apices entire (denticulate
in C.
benedicta ), glabrous or with fine, 1-celled hairs
, attachment scar
. lateral
(with or without elaiosomes) ; pappi 0 or ± persistent
, of 1-3 series of smooth or minutely barbed
, stiff bristles
or narrow scales
. x = 8, 9, 10, 11, 12, 13, 15.
Species ca.
500: introduced
; Eurasia
, n Africa, widely introduced worldwide.
Taxonomic
limits
of Centaurea have been controversial. The genus has great morphologic diversity
, and studies have revealed much cytologic (e.g.
, N. Garcia-Jacas et al.
1996) and palynologic (e.g., G. Wagenitz 1955) variation
as well. During the nineteenth and twentieth centuries, various taxonomists attempted, with limited success, to divide Centaurea into smaller genera or workable infrageneric
taxa. The relations of several satellite
genera have been controversial as well.
Recent molecular phylogenetic
studies (A. Susanna et al. 1995; N. Garcia-Jacas et al. 2000, 2001) have begun to clarify relationships
within Centaurea and between Centaurea and other genera. These studies make it clear that Centaurea as traditionally defined is polyphyletic, and that generic
boundaries should be realigned if monophyletic taxa are to be recognized. Some taxa traditionally included
within Centaurea (e.g., the two native
North American species, Centaurea americana and C. rothrockii) fall
outside the redefined generic boundaries and are here treated in Plectocephalus. Others usually placed into segregate
genera (e.g., Cnicus benedictus) are firmly nested within Centaurea. Because the type species of Centaurea (C. centaurium Linnaeus, an African species) falls
outside the main lineage
of the genus, a proposal
has been made to conserve Centaurea with a different type species (W. Greuter et al. 2001), thereby maintaining the nomenclatural
stability
of most of the numerous
species that do fall within the principal Centaurea clade.
Although several Centaurea species are widely established
as members
of the North American flora
, and some of these are widely distributed invasive weeds
, some of the taxa listed by J. T. Kartesz and C. A. Meacham (1999) are apparently waifs
and not permanent members of the flora. These taxa are discussed informally immediately below.
Although Cnicus has usually been recognized as a distinctive monotypic genus, it has been merged into Centaurea by various authors
(e.g., K
. Bremer 1994; G. Wagenitz and F. H. Hellwig 1996) . Recent molecular systematic studies (N. Garcia-Jacas et al. 2000) provide additional evidence that it is nested within Centaurea.[1]
Physical Description
Species Centaurea montana
Perennials , 25-80 cm, from rhizomes or stolons. Stems 1-several, erect , simple or sparingly branched, villous with septate hairs and thinly arachnoid-tomentose with long, simple hairs. Leaves thinly villous and ± tomentose , glabrate ; proximal leaves winged-petiolate, blades 10-30 cm, margins entire or remotely dentate to pinnately lobed ; mid and distal leaves sessile, blades decurrent, ovate to oblong or lanceolate, entire or remotely denticulate . Heads radiant, borne singly or in few-headed corymbiform arrays; (peduncles to 7 cm). Involucres ovoid to ± campanulate , 20-25 mm. Principal phyllaries: bodies greenish, ovate to lanceolate, scarious-margined, appendages appressed , brown to black, unarmed , decurrent on phyllary margins, pectinate-fringed, puberulent ; innermost phyllaries sometimes unappendaged. Florets 35-60+; sterile florets 10-20, corollas blue (white, purple, or pink), 2.5-4.5 cm, corolla tube elongate . Disc florets 25-40+; corollas purple, ca. 20 mm; anthers dark blue-purple. Cypselae ± brown, 5-6 mm, sericeous ; pappi of bristles 0.5-1.5 mm. 2n = 24 (Germany), 40 (Russia), 44 (France). [source]
Flowers: Deep blue daisy-like flower with reddish center. Long bloomer. Blooms early summer. • Bloom Period: May, June, July, August. • Flower Color: medium blue
Size/Age/Growth
Size: 20-24" tall.
Landscaping
Landscape Uses: Borders . Cut flowers. • Care: Follow a regular watering schedule during the first growing season to establish a deep, extensive root system . For a neat appearance , remove old foliage before new leaves emerge . Divide clumps every 2 to 3 years in early spring .
Habitat
Escaped from cultivation, roadsides, woodlands, sagebrush scrub ; 0-1400 m [2].
Typically found at an altitude of 0 to 2,500 meters (0 to 8,202 feet).[3]
Biology
Reproduction
Duration: Annual
Growth
Culture: Space 12-18" apart. Spread by stolons. May be invasive in rich soils or cooler climates.
Soil: Organic , well-drained, alkaline soil . • Minimum pH: 6.1 • Maximum pH: 7.8
Sunlight: Sun Exposure: Full sun
Moisture: Water Requirements: Water regularly, when top 3 in. of soil is dry.
Temperature: Heat Zones: High: 8 (>90 to 120 days) Low:1 (< 1 days) (map) • Cold Hardiness: 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b. (map)
Taxonomy
- Domain:
Eukaryota
(
)
- Whittaker & Margulis,1978
- eukaryotes
- Kingdom:
Plantae
(
)
- Haeckel, 1866
- Plants
- Subkingdom:
Viridaeplantae
(
)
- Cavalier-Smith, 1981
- Phylum:
Tracheophyta
(
)
- Sinnott, 1935 ex Cavalier-Smith, 1998
- Vascular Plants
- Subphylum:
Euphyllophytina
(
)
- Class:
Spermatopsida
(
)
- Brongniart, 1843
- Subclass:
Asteridae
(
)
- Takhtajan, 1967
- Superorder:
Campanulanae
(
)
- Takhtajan Ex Reveal, 1992
- Order:
Asterales
(
)
- Lindley, 1833
- Family:
Compositae
(
)
- Giseke, 1792, nom. cons., nom. alt.
- Subfamily:
Carduoideae
(
)
- Tribe:
Cardueae
(
)
- Subtribe:
Centaureinae
(
)
- Genus:
Centaurea
(
)
- C. Linnaeus, 1753
- Knapweed, star thistle, cornflower [Greek kentaurieon, ancient plant name associated with Chiron, a centaur famous for knowledge of medicinal plants]
- Specific epithet:
montana
- L.
- Botanical name: - Centaurea montana L.
- Specific epithet:
montana
- L.
- Genus:
Centaurea
(
- Subtribe:
Centaureinae
(
- Tribe:
Cardueae
(
- Subfamily:
Carduoideae
(
- Family:
Compositae
(
- Order:
Asterales
(
- Superorder:
Campanulanae
(
- Subclass:
Asteridae
(
- Class:
Spermatopsida
(
- Subphylum:
Euphyllophytina
(
- Phylum:
Tracheophyta
(
- Subkingdom:
Viridaeplantae
(
- Kingdom:
Plantae
(
Notes
Name
Status: Accepted Name
.
Last scrutiny: 11-Aug-09
Similar Species
Members of the genus Centaurea
ZipcodeZoo has pages for 82 species, subspecies, varieties, forms, and cultivars in this genus:
C. akamantis (Akamas Centaury) · C. alpestris (Greater Centaury) · C. americana (American Basketflower) · C. americana 'Aloha' (American Knapweed) · C. americana 'Jolly Joker' (American Knapweed) · C. aspera (Rough Star-Thistle) · C. atropurpurea (Centaurea) · C. bella (Knapweed) · C. benoistii (Maroon Cornflower) · C. biebersteinii (Ballast Waif Centaurea Biebersteinii) · C. bovina (Pasture Knapweed) · C. cachinalensis (Flor Del Minero) · C. calcitrapa (Big-Head Purple Starthistle) · C. calcitrapoides (Smallhead Star-Thistle) · C. cineraria (Dusty Miller) · C. cineraria 'Colchester White' (Dusty Miller) · C. crupina (Crupina) · C. cyanoides 'Blue Carpet' (Cornflower) · C. cyanus (Bachelor's Button) · C. cyanus nana 'Jubilee Gem' (Bachelors Button) · C. cyanus 'Black Ball' (Bachelors Button) · C. cyanus 'Black Boy' (Bachelors Button) · C. cyanus 'Black Gem' (Bachelors Button) · C. cyanus 'Black Magic' (Bachelors Button) · C. cyanus 'Blue Boy' (Bachelors Button) · C. cyanus 'Blue Diadem' (Bachelors Button) · C. cyanus 'Classic Blue' (Bachelors Button) · C. cyanus 'Dwarf Blue Midget' (Bachelors Button) · C. cyanus 'Frosted Queen Mix' (Bachelors Button) · C. cyanus 'Frosty Mix' (Bachelors Button) · C. cyanus 'Mauve Queen' (Bachelors Button) · C. cyanus 'Polka Dot Mix' (Bachelors Button) · C. dealbata (Knapweed Centaurea Dealbata) · C. dealbata 'Rosea' (Knapweed) · C. debeauxii (Meadow Knapweed) · C. debeauxii thuillieri (Meadow Knapweed) · C. debeauxii subsp. thuillieri (Meadow Knapweed) · C. depressa (Centaurea) · C. diffusa (Diffuse Knapweed) · C. diluta (North African Knapweed) · C. eriophora (Sand-Heath) · C. gymnocarpa (Velvet Centaurea) · C. hypoleuca DC. 'John Coutts' (Knapweed) · C. iberica (Iberian Knapweed) · C. jacea (Brown Knapweed) · C. jacea x nigra (Hybrid Knapweed Centaurea Jacea X Nigra) · C. macrocephala (Armenian Basketflower) · C. melitensis (Cockspur Thistle) · C. moncktonii (Meadow Knapweed) · C. montana (Mountain Bluet) · C. montana 'Alba' (Mountain Bluet) · C. montana 'Amethyst in Snow' (Mountain Bluet) · C. montana 'Dot Purple' (Mountain Bluet) · C. montana 'Gold Bullion' (Batchelor's Button) · C. moschata 'Dairy Maid' (Sweet Sultan) · C. moschata 'Imperialis' (Sweet Sultan) · C. moschata 'The Bride' (Sweet Sultan) · C. nigra (Black Knapweed) · C. nigrescens (Short-Fringe Starthistle) · C. orientalis (Centaurea) · C. ovina (Lilac Knapweed) · C. paniculata (Jersey Knapweed) · C. phrygia (Scandinavian Starthistle) · C. pindicola (Centaurea) · C. pulcherrima (Pink Bachelors Button) · C. 'Pulchra Major' (Bachelor's Button) · C. ragusina (Dubrovacka Zecina) · C. rothrockii (Basket Flower) · C. scabiosa (Great Starthistle) · C. solstitialis (Barnaby Star-Thistle) · C. solstitialis solstitialis (St. Barnaby's Thistle) · C. stoebe (Spotted Knapweed) · C. sulphurea (Sicilian Starthistle) · C. thuillieri (Meadow Knapweed) · C. transalpina (Alpine Knapweed) · C. trichocephala (Feather-Head Knapweed) · C. triumfetti (Squarrose Knapweed Centaurea Triumfetti) · C. triumfettii (Spreading Thistle) · C. uniflora (Single-Flower Knapweed) · C. uniflora nervosa (Singleflower Knapweed) · C. xpratensis (Meadow Knapweed) · C.'Nigra' (Bachelor Buttons)
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Further Reading
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- A dictionary of the flowering plants and ferns, by J. C. Willis. CambridgeThe University Press, 1919 url p. 129.
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- A little book of perennials, by Alfred C. Hottes. New York, N. Y., The A. T. De La Mare1923. url p. 165.
- A practical guide to garden plants, containing descriptions of the hardiest and most beautiful annuals and biennials, hardy herbaceous and bulbous perennials, hardy water and bog plants, flowering and ornamental trees and shrubs, conife London;Longmans, Green, 1901. url , , p. 88.
- A supplement to the Pharmacopia, and treatise on pharmacology in general: including not only the drugs and preparations used by practitioners of medicine, but also most of those employed in the chemical arts: together with a collection of the most useful medical formulæ. . by Samuel Frederic Gray. London: Longman, Rees, Orme, Brown, Green, and Longman, 1836. url p. 66.
- Acta Societatis pro Fauna et Flora Fennica. Helsinki: Societas, 1875-1980. url p. 102, p. 58.
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- An encyclopædia of gardening; comprising the theory and practice of horticulture, floriculture, arboriculture, and landscape-gardening, including all the latest improvements; a general history of gardening in all countries; and a By J.C. Loudon. .. illustrated with many hundred engravings on wood by Branston. London: Printed for Longman, Rees, Orme, Brown, and Green, 1827. url p. 884.
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Notes
Contributors
- Brands, S.J. (comp.) 1989-present. The Taxonomicon. Universal Taxonomic Services, Zwaag, The Netherlands. Accessed March 27, 2012.
Data Sources
Accessed through GBIF Data Portal November 15, 2007:
- Jyväskylä University Museum - The Section of Natural Sciences, Vascular plant collection of Jyvaskyla University Museum
- Oregon State University, Vascular Plant Collection
- UK National Biodiversity Network, Botanical Society of the British Isles - Vascular Plants Database
Identifiers
- Biodiversity Heritage Library NamebankID: 2658264
- Catalogue of Life Accepted Name Code: Ast-22286
- Global Biodiversity Information Facility Taxonkey: 13727278
- Globally Unique Identifier: urn:lsid:ipni.org:names:191037-1
- GRIN Nomen Number: 401601
- Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 36966
- Natural Heritage Network Species Identifier: PDAST1Y0E0
- U.S.D.A. Plant Symbol: CEMO
- Zipcode Zoo Species Identifier: 27163
Footnotes
- David J. Keil, Jörg Ochsmann "Centaurea". in Flora of North America Vol. 19, 20 and 21 Page 52, 57, 58, 67, 83, 84, 96, 171, 172, 176, 177, EFloras.org. [back]
- "Centaurea montana". in Flora of North America Vol. 19, 20 and 21 Page 183, 185. Oxford University Press. Online at EFloras.org. [back]
- Mean = 178.660 meters (586.155 feet), Standard Deviation = 210.110 based on 3,862 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
