Difference between revisions of "Thurovia"
Contr. U.S. Natl. Herb. 3: 321. 1895.
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|distribution=Tex. | |distribution=Tex. | ||
|discussion=<p>Species 1.</p><!-- | |discussion=<p>Species 1.</p><!-- | ||
| − | --><p>Thurovia was treated by M. A. Lane (1985) within Gutierrezia; data of Y. Suh and B. B. Simpson (1990) indicated it to be the sister group of Amphiachyris. The species is distinctive in its spiciform arrays of tiny, axillary, few-flowered, discoid heads with white corollas, densely sericeous cypselae, and pappi of scales.</p> | + | --><p><i>Thurovia</i> was treated by M. A. Lane (1985) within <i>Gutierrezia</i>; data of Y. Suh and B. B. Simpson (1990) indicated it to be the sister group of <i>Amphiachyris</i>. The species is distinctive in its spiciform arrays of tiny, axillary, few-flowered, discoid heads with white corollas, densely sericeous cypselae, and pappi of scales.</p> |
|tables= | |tables= | ||
|references={{Treatment/Reference | |references={{Treatment/Reference | ||
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|publication year=1895 | |publication year=1895 | ||
|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/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V20_165.xml |
|tribe=Asteraceae tribe Astereae | |tribe=Asteraceae tribe Astereae | ||
|genus=Thurovia | |genus=Thurovia | ||
Revision as of 16:21, 18 September 2019
Annuals or perennials, 6–45 cm (eglandular; taprooted or roots spreading laterally in perennials). Stems erect, branched mostly in distal 1/2, glabrous. Leaves cauline; alternate; sessile; blades (1-nerved) linear-filiform, margins entire, faces glabrous. Heads discoid, usually in (secund) spiciform arrays. Involucres narrowly cylindro-obconic, (3–4 ×) 1.5–2 mm. Phyllaries 5–9 in 2 series, 1-nerved (usually convex and without prominent midnerves) outermost linear-oblong and mostly green, oblong-lanceolate, subequal to unequal, white-indurate proximally, proximal margins scarious, (apices acute), faces glabrous. Receptacles flat, shallowly pitted (glabrous), epaleate. Disc florets 3, bisexual, fertile; corollas white or pale yellow, tubes shorter than funnelform throats, lobes 5, spreading-recurved, narrowly lanceolate (lengths 1/2 corollas); style-branch appendages linear-lanceolate. Cypselae obconic, subterete, 4-nerved (subdermal, hardly evident), densely and evenly white-sericeous; pappi persistent, of 10 silvery white, ovate-lanceolate, erose or apiculate scales in 2 series. x = 5.
Discussion
Species 1.
Thurovia was treated by M. A. Lane (1985) within Gutierrezia; data of Y. Suh and B. B. Simpson (1990) indicated it to be the sister group of Amphiachyris. The species is distinctive in its spiciform arrays of tiny, axillary, few-flowered, discoid heads with white corollas, densely sericeous cypselae, and pappi of scales.