Difference between revisions of "Gutierrezia microcephala"
Mem. Amer. Acad. Arts, n. s. 4: 74. 1849.
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|name=Brachyris microcephala | |name=Brachyris microcephala | ||
|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: 313. 1836 | |publication_place=5: 313. 1836 | ||
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|name=Gutierrezia sarothrae var. microcephala | |name=Gutierrezia sarothrae var. microcephala | ||
|authority=(de Candolle) L. D. Benson | |authority=(de Candolle) L. D. Benson | ||
| + | |rank=variety | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Xanthocephalum microcephalum | |name=Xanthocephalum microcephalum | ||
|authority=(de Candolle) Shinners | |authority=(de Candolle) Shinners | ||
| + | |rank=species | ||
}} | }} | ||
|hierarchy=Asteraceae;Asteraceae tribe Astereae;Gutierrezia;Gutierrezia microcephala | |hierarchy=Asteraceae;Asteraceae tribe Astereae;Gutierrezia;Gutierrezia microcephala | ||
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name=Gutierrezia microcephala | name=Gutierrezia microcephala | ||
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|authority=(de Candolle) A. Gray | |authority=(de Candolle) A. Gray | ||
|rank=species | |rank=species | ||
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|publication year=1849 | |publication year=1849 | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V20_177.xml |
|tribe=Asteraceae tribe Astereae | |tribe=Asteraceae tribe Astereae | ||
|genus=Gutierrezia | |genus=Gutierrezia | ||
Latest revision as of 21:01, 5 November 2020
Subshrubs, 20–140 cm. Stems glabrous or minutely hispidulous. Leaves: basal and proximal absent at flowering; cauline blades 1-nerved, linear or filiform to narrowly oblanceolate or lanceolate, 0.5–2.2(–4) mm wide, little reduced distally. Heads (2–6, sessile to subsessile, in compact glomerules) in flat-topped arrays. Involucres cylindric, 1–1.5 mm diam. Phyllary apices flat. Ray florets 1(–2; each enclosed by conduplicate inner phyllary); corollas yellow, (1.5–)2–3.5 mm. Disc florets 1, sometimes 2 (functionally staminate; corollas broadly obdeltate-funnelform, throats widely flaring, lobes 1/3 corolla lengths, recurved-coiling). Cypselae 1–1.8(–2.5) mm, faces densely strigoso-sericeous; pappi (rays, readily falling) of 1 series of narrowly lanceolate-oblong scales. 2n = 8, 16, 24, 32.
Phenology: Flowering (Jun–)Jul–Dec(–Feb).
Habitat: Grasslands, chaparral, oak or oak-pine woodlands, usually over gravelly or rocky limestone or gypsum substrates, dunes
Elevation: 800–2500 m
Distribution
Ariz., Calif., Colo., Nev., N.Mex., Tex., Utah, Mexico (Baja California, Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Sonora, Tamaulipas, Veracruz, Zacatecas).
Discussion
Gutierrezia microcephala is recognized by its perennial habit and its small, tightly clustered heads, each with 4–8 phyllaries and 1(–2) ray and disc florets. Each ray floret is enclosed by a conduplicate inner phyllary. Forms of G. sarothrae with few florets in each head can be distinguished by their bisexual and fertile disc florets and tubular-funnelform disc corollas.
Selected References
None.