Show Lower Taxa
Difference between revisions of "Gutierrezia texana"
Fl. N. Amer. 2: 194. 1842.
Common names: Texas snakeweed
Basionym: Hemiachyris texana de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 314. 1836
Synonyms: Xanthocephalum texanum (de Candolle) Shinners
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|name=Hemiachyris texana | |name=Hemiachyris texana | ||
|authority=de Candolle | |authority=de Candolle | ||
| + | |rank=species | ||
|publication_title=in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. | |publication_title=in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. | ||
|publication_place=5: 314. 1836 | |publication_place=5: 314. 1836 | ||
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|name=Xanthocephalum texanum | |name=Xanthocephalum texanum | ||
|authority=(de Candolle) Shinners | |authority=(de Candolle) Shinners | ||
| + | |rank=species | ||
}} | }} | ||
|hierarchy=Asteraceae;Asteraceae tribe Astereae;Gutierrezia;Gutierrezia texana | |hierarchy=Asteraceae;Asteraceae tribe Astereae;Gutierrezia;Gutierrezia texana | ||
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| − | --><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 10–80(–100) cm. <b>Stems</b> glabrous. <b>Leaves</b>: proximal usually absent at flowering; cauline blades 1- or 3-nerved, linear, 1.5–4 mm wide, reduced distally. <b>Heads</b> in loose arrays. <b>Involucres</b> campanulate to obconic, 2–4.5 mm diam.. <b>Phyllary</b> apices flat. <b>Ray</b> florets 5–23; corollas yellow, 3–6 mm. <b>Disc</b> florets 7–48 (bisexual and fertile or functionally staminate). <b>Cypselae</b> 1.3–1.8 mm, faces without oil cavities, loosely strigose (hairs appressed, apices acute, microscopically 2-pronged); pappi of 1 series of spreading-erect, oblong to ovate or obovate scales 0.1–0.5 mm (bases sometimes connate, usually shorter in rays, sometimes 0 in < | + | --><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 10–80(–100) cm. <b>Stems</b> glabrous. <b>Leaves</b>: proximal usually absent at flowering; cauline blades 1- or 3-nerved, linear, 1.5–4 mm wide, reduced distally. <b>Heads</b> in loose arrays. <b>Involucres</b> campanulate to obconic, 2–4.5 mm diam.. <b>Phyllary</b> apices flat. <b>Ray</b> florets 5–23; corollas yellow, 3–6 mm. <b>Disc</b> florets 7–48 (bisexual and fertile or functionally staminate). <b>Cypselae</b> 1.3–1.8 mm, faces without oil cavities, loosely strigose (hairs appressed, apices acute, microscopically 2-pronged); pappi of 1 series of spreading-erect, oblong to ovate or obovate scales 0.1–0.5 mm (bases sometimes connate, usually shorter in rays, sometimes 0 in <i></i>var.<i> texana</i>).</span><!-- |
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name=Gutierrezia texana | name=Gutierrezia texana | ||
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|authority=(de Candolle) Torrey & A. Gray | |authority=(de Candolle) Torrey & A. Gray | ||
|rank=species | |rank=species | ||
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|publication year=1842 | |publication year=1842 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V20_173.xml |
|tribe=Asteraceae tribe Astereae | |tribe=Asteraceae tribe Astereae | ||
|genus=Gutierrezia | |genus=Gutierrezia | ||
Revision as of 20:26, 16 December 2019
Annuals, 10–80(–100) cm. Stems glabrous. Leaves: proximal usually absent at flowering; cauline blades 1- or 3-nerved, linear, 1.5–4 mm wide, reduced distally. Heads in loose arrays. Involucres campanulate to obconic, 2–4.5 mm diam.. Phyllary apices flat. Ray florets 5–23; corollas yellow, 3–6 mm. Disc florets 7–48 (bisexual and fertile or functionally staminate). Cypselae 1.3–1.8 mm, faces without oil cavities, loosely strigose (hairs appressed, apices acute, microscopically 2-pronged); pappi of 1 series of spreading-erect, oblong to ovate or obovate scales 0.1–0.5 mm (bases sometimes connate, usually shorter in rays, sometimes 0 in var. texana).
Distribution
s, sc United States, Mexico.
Discussion
Varieties 2 (2 in the flora).
Although the two varieties of Gutierrezia texana are similar, the geographic demarcation between them appears to be sharp, and a detailed investigation of their biologic interaction would be interesting.
Selected References
None.
Key
| 1 | Involucres (2–)3.5–4.5 mm diam.; disc florets 10–48; cypselae moderately to densely strigoso-sericeous, hairs usually in dense lines and at least partially obscuring faces; pappi of distinct scales 0.2–0.5 mm, rarely more reduced | Gutierrezia texana var. glutinosa |
| 1 | Involucres 2–3 mm diam.; disc florets 7–13; cypselae sparsely and evenly strigose, hairs not obscuring cypsela faces; pappi of continuous or scaly crowns less than 0.1 mm | Gutierrezia texana var. texana |