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Hooker's Scratchdaisy

Croptilon hookerianum (Torr. & A. Gray) House

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Comments

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Morphologic differences among the three varieties are slight and they form a closely coherent group within the genus; corresponding differences in geography, habitat, and chromosome number provide a rationale for maintaining the taxonomic and nomenclatural distinctions. B. L. Turner et al. (2003, vol. 1) treated var. hookerianum as including var. graniticum. B chromosomes sometimes are present and appear to increase the number by a pair (E. B. Smith 1966).
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 20: 229 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Description

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Stems erect, 20–80(–120) cm. Cauline leaf blades lanceolate to linear, reduced distally (becoming bractlike near heads), margins usually serrate apically, rarely entire. Peduncles stipitate-glandular, sometimes hispid as well. Involucres campanulate, (3.5–)5–8(–10) mm diam. Ray florets (10–)13–21(–29); corolla laminae 6–12 mm. Disc florets (20–)33–70(–108). 2n = 10, 12, 14.
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 20: 229 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
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Synonym

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Isopappus hookerianus Torrey & A. Gray, Fl. N. Amer. 2: 239. 1842; Croptilon divaricatum (Nuttall) Rafinesque var. hookerianum (Torrey & A. Gray) Shinners; Haplopappus validus (Rydberg) Cory subsp. torreyi E. B. Smith
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 20: 229 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
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eFloras

Croptilon hookerianum

provided by wikipedia EN

Croptilon hookerianum, called Hooker's scratchdaisy, is a North American species of flowering plants in the tribe Astereae within the family Asteraceae. It has been found in the US states of Texas, Oklahoma, Kansas, and Arkansas.[2]

Croptilon hookerianum is an herb sometimes reaching a height of 120 cm (4 feet). Flower heads are yellow, with both ray florets and disc florets.[3]

Varieties
  • Croptilon hookerianum var. graniticum (E.B.Sm.) E.B.Sm. - Texas
  • Croptilon hookerianum var. hookerianum - Texas
  • Croptilon hookerianum var. validum (Rydb.) E.B.Sm. - Arkansas, Kansas, Oklahoma, Texas

References

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Croptilon hookerianum: Brief Summary

provided by wikipedia EN

Croptilon hookerianum, called Hooker's scratchdaisy, is a North American species of flowering plants in the tribe Astereae within the family Asteraceae. It has been found in the US states of Texas, Oklahoma, Kansas, and Arkansas.

Croptilon hookerianum is an herb sometimes reaching a height of 120 cm (4 feet). Flower heads are yellow, with both ray florets and disc florets.

Varieties Croptilon hookerianum var. graniticum (E.B.Sm.) E.B.Sm. - Texas Croptilon hookerianum var. hookerianum - Texas Croptilon hookerianum var. validum (Rydb.) E.B.Sm. - Arkansas, Kansas, Oklahoma, Texas
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