Fl. Londin.2(6,61): plate 55. 1789
Phenology: Flowering spring–early summer (Apr–Jul).
Habitat: Aggressive weed of waste ground, pastures, roadsides, fields
Elevation: 0–1000 m
Calif., Oreg., Pa., s Europe (Mediterranean region).
Carduus tenuiflorus has been reported from New Jersey, Texas, and Washington; I have not seen specimens from those states.
Carduus pycnocephalus and C. tenuiflorus are similar annuals with small, usually tightly clustered heads. The number of heads per capitulescence is usually ultimately greater in C. tenuiflorus, but early season plants of this species often have only a few heads. At the end of the growing season the fruiting heads of C. tenuiflorus are aggregated in dense, subspheric clusters. Stem wings tend to be more pronounced in C. tenuiflorus. Fresh corollas of C. pycnocephalus are rose-purple whereas those of C. tenuiflorus have a more pinkish tinge, but this difference is subtle and not reliable on herbarium material. The phyllaries of C. tenuiflorus are membranous-margined, more or less glabrate, and lack the short, stiff, upwardly appressed trichomes of C. pycnocephalus. All published chromosome counts for Carduus tenuiflorus from both Old and New World material are the same.
The two species sometimes grow in mixed populations and at times appear to intergrade. Hybridization has been reported in Europe (S. W. T. Batra et al. 1981) and is suspected to occur in California. Hybrids between C. pycnocephalus and C. tenuiflorus have been designated Carduus ×theriotii Rouy.
|Author||David J. Keil +|
|Basionyms||Asteraceae tribe Cynareae +|
|Common name||Slender-flowered thistle +|
|Distribution||Calif. +, Oreg. +, Pa. + and s Europe (Mediterranean region). +|
|Elevation||0–1000 m +|
|Habitat||Aggressive weed of waste ground, pastures, roadsides, fields +|
|Illustration copyright||Flora of North America Association +|
|Illustrator||John Myers +|
|Phenology||Flowering spring–early summer (Apr–Jul). +|
|Publication title||Fl. Londin. +|
|Publication year||1789 +|
|Source xml||https://firstname.lastname@example.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V19-20-21/V19 50.xml +|
|Synonyms||Carduus pycnocephalus var. tenuiflorus +|
|Taxon family||Asteraceae +|
|Taxon name||Carduus tenuiflorus +|
|Taxon parent||Carduus +|
|Taxon rank||species +|
|Volume||Volume 19 +|