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Carduus acanthoides

(Plumeless Thistle)

Overview

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Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in English:

Plumeless Thistle, Spiny Plumeless Thistle, Spiny Plumeless-Thistle, Welted Thistle

Common Names in French:

Chardon épineux

Common Names in German:

Brachdistel, Distel, Dorn, Dornbusch, Dornstrauch, Felddistel, Korndistel, Stacheldistel, Weg-Distel

Common Names in Hungarian:

Uteszéli Bogancs

Common Names in Portuguese:

Cardo-Chileno, Cardo-Espinhoso, Cardo-Pratense

Description

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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 Carduus

Annuals or biennials [perennials ], 30-200(-400) cm. spiny , ± tomentose , sometimes glabrate . Stems erect , simple to much branched, (spiny-winged) . Leaves basal and cauline; petiolate or sessile; blade margins spiny dentate, often 1-2-pinnately lobed , faces glabrous or hairy , eglandular . Heads discoid , borne singly or 2-20 in dense clusters or corymbiform arrays. (Peduncles naked or leafy-bracteate, spiny-winged or not winged .) Involucres cylindric to spheric. Phyllaries many in 7-10+ series, linear to broadly ovate , bases appressed , margins entire, apices ascending to spreading or reflexed , acute, spine-tipped. Receptacles flat, epaleate, bearing setiform scales ("flattened bristles"). Florets several-many; corollas white to pink or purple, ± bilateral , tubes long, slender, throats short, campanulate , abruptly expanded from tubes, lobes linear; anther bases sharply short-tailed, apical appendages oblong ; style branches: fused portions with slightly, minutely puberulent , swollen basal nodes, distally papillate or glabrous, distinct portions very short. Cypselae ovoid , slightly compressed , faces smooth . glabrous, attachment scars slightly lateral ; pappi persistent or falling in rings . of many minutely barbed , basally connate bristles or setiform, minutely barbed scales ("minutely flattened bristles"). x = 8, 9, 10, 11, 13.

Species ca. 90: introduced ; Eurasia , Africa.[1]

Physical Description

Habit: Forb/herb

Flowers: Bloom Period: June, July, August, September. • Flower Color: mauve , rose

Size/Age/Growth

Size: 18-24" tall.

Habitat

Typically found at an altitude of 0 to 4,002 meters (0 to 13,130 feet).[2]

Ecology: Invasive: invades roadsides, pastures, and open native habitats , seeds dispersed by wind and wildlife. Declared prohibited noxious weeds in Maryland. These weeds must be controlled by anyone owning or managing land within the State.

Biology

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Reproduction

Duration: Biennial

Growth

Culture: Space 18-24" apart.

Soil: Minimum pH: 5.1 • Maximum pH: 8.5

Sunlight: Sun Exposure: Full Sun .

Moisture: Drought Tolerance: High

Temperature: Cold Hardiness: 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b. (map)

Taxonomy

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Notes

Name Status: Accepted Name .

Last scrutiny: 17-Nov-09

Similar Species

Members of the genus Carduus

ZipcodeZoo has pages for 11 species, subspecies, varieties, forms, and cultivars in this genus:

C. acanthoides (Plumeless Thistle) · C. crispus (Curled Plumless-Thistle) · C. nutans (Chardon Penche) · C. nutans macrocephalus (Musk Thistle) · C. nutans macrolepis (Chardon Penche) · C. nutans var. litoralis (Nodding Thistle) · C. orthocephalus (Plumeless Thistle) · C. pycnocephalus (Compact-Headed Thistle) · C. scariosus (Meadow Thistle) · C. tenuiflorus (Italian Thistle) · C. x orthocephalus (Plumeless Thistle)

More Info

Further Reading

Notes

Contributors

Data Sources

Accessed through GBIF Data Portal November 24, 2007:

Identifiers

Footnotes

  1. David J. Keil "Carduus". in Flora of North America Vol. 19, 20 and 21 Page 57, 66, 83, 91, 96, 97, 122. Oxford University Press. Online at EFloras.org. [back]
  2. Mean = 309.620 meters (1,015.814 feet), Standard Deviation = 358.800 based on 1,900 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/14/2012