Difference between revisions of "Croptilon hookerianum"

(Torrey & A. Gray) House

Bull. New York State Mus. Nat. Hist. 223: 61. 1921.

Common names: Hooker’s scratchdaisy
Endemic
Basionym: Isopappus hookerianus Torrey & A. Gray Fl. N. Amer. 2: 239. 1842
Synonyms: Croptilon divaricatum var. hookerianum (Torrey & A. Gray) Shinners Haplopappus validus subsp. torreyi E. B. Smith
Treatment appears in FNA Volume 20. Treatment on page 229.
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|common_names=Hooker’s scratchdaisy
 
|common_names=Hooker’s scratchdaisy
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|special_status={{Treatment/ID/Special_status
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|code=E
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|label=Endemic
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}}
 
|basionyms={{Treatment/ID/Basionym
 
|basionyms={{Treatment/ID/Basionym
 
|name=Isopappus hookerianus
 
|name=Isopappus hookerianus
 
|authority=Torrey & A. Gray
 
|authority=Torrey & A. Gray
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|rank=species
 
|publication_title=Fl. N. Amer.
 
|publication_title=Fl. N. Amer.
 
|publication_place=2: 239. 1842
 
|publication_place=2: 239. 1842
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|name=Croptilon divaricatum var. hookerianum
 
|name=Croptilon divaricatum var. hookerianum
 
|authority=(Torrey & A. Gray) Shinners
 
|authority=(Torrey & A. Gray) Shinners
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|rank=variety
 
}} {{Treatment/ID/Synonym
 
}} {{Treatment/ID/Synonym
 
|name=Haplopappus validus subsp. torreyi
 
|name=Haplopappus validus subsp. torreyi
 
|authority=E. B. Smith
 
|authority=E. B. Smith
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|rank=subspecies
 
}}
 
}}
 
|hierarchy=Asteraceae;Asteraceae tribe Astereae;Croptilon;Croptilon hookerianum
 
|hierarchy=Asteraceae;Asteraceae tribe Astereae;Croptilon;Croptilon hookerianum
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|distribution=sc United States
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|distribution=Ark.;Kans.;Okla.;Tex.
 
|discussion=<p>Varieties 3 (3 in the flora).</p><!--
 
|discussion=<p>Varieties 3 (3 in the flora).</p><!--
--><p>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 <i></i></i>var.<i><i> hookerianum</i> as including <i></i></i>var.<i><i> graniticum</i>. B chromosomes sometimes are present and appear to increase the number by a pair (E. B. Smith 1966).</p>
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--><p>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 <i></i>var.<i> hookerianum</i> as including <i></i>var.<i> graniticum</i>. B chromosomes sometimes are present and appear to increase the number by a pair (E. B. Smith 1966).</p>
 
|tables=
 
|tables=
 
|references=
 
|references=
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-->{{#Taxon:
 
name=Croptilon hookerianum
 
name=Croptilon hookerianum
|author=
 
 
|authority=(Torrey & A. Gray) House
 
|authority=(Torrey & A. Gray) House
 
|rank=species
 
|rank=species
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|basionyms=Isopappus hookerianus
 
|basionyms=Isopappus hookerianus
 
|family=Asteraceae
 
|family=Asteraceae
|distribution=sc United States
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|distribution=Ark.;Kans.;Okla.;Tex.
 
|reference=None
 
|reference=None
 
|publication title=Bull. New York State Mus. Nat. Hist.
 
|publication title=Bull. New York State Mus. Nat. Hist.
 
|publication year=1921
 
|publication year=1921
|special status=
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|special status=Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V20_508.xml
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|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V20_508.xml
 
|tribe=Asteraceae tribe Astereae
 
|tribe=Asteraceae tribe Astereae
 
|genus=Croptilon
 
|genus=Croptilon
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[[Category:Revised Since Print]]

Latest revision as of 18:20, 6 November 2020

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.

Discussion

Varieties 3 (3 in the flora).

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).

Selected References

None.

Key

1 Peduncles long-stipitate-glandular (longest hairs 0.4–0.5 mm, including gland), often slightly hispid proximal to heads; ray laminae 1–2.5 mm wide Croptilon hookerianum var. validum
1 Peduncles short-stipitate-glandular (longest hairs 0.2–0.3 mm, including gland), never hispid; ray laminae (1.2–)2–3(–4) mm wide > 2
2 Peduncles densely stipitate-glandular; ray laminae 1.2–2.2 mm wide; sandy habitats Croptilon hookerianum var. hookerianum
2 Peduncles sparsely stipitate-glandular; ray laminae (1.5–)2–3(–4) mm wide; granitic habitats Croptilon hookerianum var. graniticum