Difference between revisions of "Epithelantha micromeris var. micromeris"
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|accepted_name=Epithelantha micromeris var. micromeris | |accepted_name=Epithelantha micromeris var. micromeris | ||
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|publications= | |publications= | ||
|common_names=Common button cactus | |common_names=Common button cactus | ||
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|elevation=500-1800 m | |elevation=500-1800 m | ||
|distribution=Ariz.;N.Mex.;Tex. | |distribution=Ariz.;N.Mex.;Tex. | ||
| − | |discussion=<p>Epithelantha micromeris var. micromeris has the smallest flowers of any cactus species in the flora. Unlike other taxa in this genus, it is autogamous. No hybrids with E. bokei have been found. The spines of var. var. micromeris are never as strongly appressed as on E. bokei except on sexually immature plants less than 15 mm in diameter; those immature plants have the fewest spines.</p> | + | |discussion=<p><i>Epithelantha micromeris </i>var.<i> micromeris</i> has the smallest flowers of any cactus species in the flora. Unlike other taxa in this genus, it is autogamous. No hybrids with <i>E. bokei</i> have been found. The spines of var. <i></i>var.<i> micromeris</i> are never as strongly appressed as on <i>E. bokei</i> except on sexually immature plants less than 15 mm in diameter; those immature plants have the fewest spines.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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name=Epithelantha micromeris var. micromeris | name=Epithelantha micromeris var. micromeris | ||
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| − | |authority= | ||
|rank=variety | |rank=variety | ||
|parent rank=species | |parent rank=species | ||
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|publication year= | |publication year= | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V4/V4_437.xml |
|subfamily=Cactaceae subfam. Cactoideae | |subfamily=Cactaceae subfam. Cactoideae | ||
|genus=Epithelantha | |genus=Epithelantha | ||
Latest revision as of 21:58, 5 November 2020
Plants usually unbranched, appearing ashy gray and rough in general aspect. Stems short cylindric to ovoid, (1.3–)2–3.8 cm diam. Spines 20–35(–40) per areole, in 1–3 series, mature lateral spine clusters grayish or purplish white with brown bases, collectively appearing as brown spot at center of each spine cluster, 4–5(–7) mm diam.; longest intact spines near apex of stem 3–12 mm; worn spines 1–3 mm. Flowers partially obscured by longer spines at stem apex, 6–8.5 × 3–4.6 mm; inner tepals 5–8 per flower, (1–)2.5–3.5 × 1–2 mm; stamens 15–16. 2n = 22.
Phenology: Flowering late winter–early spring (Feb–Apr); fruiting late spring–early summer (Apr–Jun).
Habitat: Woodlands, deserts, grasslands, crevices, coarse gravel, cliffs, sedimentary (rarely igneous) substrates
Elevation: 500-1800 m
Distribution
Ariz., N.Mex., Tex.
Discussion
Epithelantha micromeris var. micromeris has the smallest flowers of any cactus species in the flora. Unlike other taxa in this genus, it is autogamous. No hybrids with E. bokei have been found. The spines of var. var. micromeris are never as strongly appressed as on E. bokei except on sexually immature plants less than 15 mm in diameter; those immature plants have the fewest spines.
Selected References
None.