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Cirsium occidentale (Nutt.) Jeps.

Cobwebby thistle (en)

Species

Angiosperms > Asterales > Asteraceae > Cirsium

Characteristics

A herb. It is a thistle which completes its life cycle over 2 years. It is a spiky plant. The leaves form a ring or rosette near the base. It grows 60-150 cm high and spreads 90 cm wide. The flower heads are in clusters and are spiny. There are white woolly bracts around the flower head. The flowers are bright red. The leaves are deeply divided and bear spikes.
Life form
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination
Spread -
Mature width (meter) 0.9
Mature height (meter) 1.0
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Coastal scrub, dunes, pine-oak woodlands, riparian woodlands, arid woodlands, chaparral, openings in mixed evergreen forests, roadsides; at elevations from near sea level to 2,300 metres
More
It is a temperate plant. It does best in full sun. It can grow in average soils but they should be well drained.
Light 7-9
Soil humidity 3-7
Soil texture 2-5
Soil acidity 3-7
Soil nutriment -
Hardiness (USDA) 7-10

Usage

Uses oil
Edible roots stems
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Plants are grown from seed. The seed are sown directly. Plants should be 20-30 cm apart. Plants reseed easily.
Mode seedlings
Germination duration (days) 15 - 18
Germination temperacture (C°) 21 - 23
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Cirsium occidentale unspecified picture

Distribution

Cirsium occidentale world distribution map, present in United States of America

Identifiers

LSID urn:lsid:ipni.org:names:59091-2
WFO ID wfo-0000074921
COL ID VJ8L
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Cnicus lilacinus Cnicus occidentalis Cirsium occidentale Cnicus neglectus Carduus occidentalis Carduus occidentalis var. occidentalis

Lower taxons

Cirsium occidentale var. californicum Cirsium occidentale var. venustum Cirsium occidentale var. candidissimum Cirsium occidentale var. coulteri Cirsium occidentale var. lucianum Cirsium occidentale var. compactum
WorldFloraDB 2024