Difference between revisions of "Croptilon hookerianum"
Bull. New York State Mus. Nat. Hist. 223: 61. 1921.
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|common_names=Hooker’s scratchdaisy | |common_names=Hooker’s scratchdaisy | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
| + | }} | ||
|basionyms={{Treatment/ID/Basionym | |basionyms={{Treatment/ID/Basionym | ||
|name=Isopappus hookerianus | |name=Isopappus hookerianus | ||
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-->{{Treatment/Body | -->{{Treatment/Body | ||
| − | |distribution= | + | |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>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> | --><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> | ||
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|basionyms=Isopappus hookerianus | |basionyms=Isopappus hookerianus | ||
|family=Asteraceae | |family=Asteraceae | ||
| − | |distribution= | + | |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= | + | |special status=Endemic |
| − | |source xml=https:// | + | |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V19-20-21/V20_508.xml |
|tribe=Asteraceae tribe Astereae | |tribe=Asteraceae tribe Astereae | ||
|genus=Croptilon | |genus=Croptilon | ||
Revision as of 20:49, 27 May 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.
Distribution
Ark., Kans., Okla., Tex.
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.
Lower Taxa
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 |