View source for Thelocactus bicolor var. flavidispinus

{{Treatment/ID
|accepted_name=Thelocactus bicolor var. flavidispinus
|accepted_authority=Backeberg
|publications={{Treatment/Publication
|title=Beitr. Sukkulentenk. Sukkulentenpflege
|place=1941: 6. 1941
|year=1941
}}
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms=
|hierarchy=Cactaceae;Cactaceae subfam. Cactoideae;Thelocactus;Thelocactus bicolor;Thelocactus bicolor var. flavidispinus
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Cactaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Cactaceae subfam. Cactoideae]]</div><div class="higher-taxon"><small>genus</small>[[Thelocactus]]</div><div class="higher-taxon"><small>species</small>[[Thelocactus bicolor]]</div><div class="higher-taxon"><small>variety</small>[[Thelocactus bicolor var. flavidispinus]]</div></div>
|volume=Volume 4
|mention_page=
|treatment_page=page 218
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>unbranched (very rarely branched), deep-seated in substrate. <b>Stems</b> flat-topped when young, ± spheric (rarely short cylindric when old), 3–9(–13) × 4–6(–7) cm, surface hidden by spines; ribs poorly defined, ca. 13, tubercles confluent only at extreme bases (youngest sexually mature plants strictly tuberculate), 8–15 mm wide; areoles spaced 6–15 mm apart along ribs. <b>Spines</b> yellow (very rarely some individuals red); radial spines 12–20 per areole, longest spines 9–18(–24) mm; adaxial (bladelike) spines 18–35(–40) × 0.5–1.5 mm; central spines (0–)1(–4), longest spines terete, (9–)13–18(–24) × 0.4–0.5 mm. <b>2n</b> = 22.</span><!--

-->{{Treatment/Body
|phenology=Flowering Mar–Sep.
|habitat=Caballos novaculite outcrops in semidesert grasslands
|elevation=1200-1300 m
|distribution=Tex.
|discussion=<p><i>Thelocactus bicolor </i>var.<i> flavidispinus</i> is the most widespread of the several taxa of cacti endemic to novaculite, a highly fractured, quartzlike rock. Unusually tall and/or red-spined individuals within populations of <i></i>var.<i> flavidispinus</i> have been the basis for mistaken reports of <i></i>var.<i> bicolor</i> in the region of novaculite, where only <i></i>var.<i> flavidispinus</i> occurs. The reports of <i></i>var.<i> flavidispinus</i> in south Texas (Starr County; L. D. Benson 1982) are based on misidentified <i>T. bicolor </i>var.<i> bicolor</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Thelocactus bicolor var. flavidispinus
|authority=Backeberg
|rank=variety
|parent rank=species
|synonyms=
|basionyms=
|family=Cactaceae
|phenology=Flowering Mar–Sep.
|habitat=Caballos novaculite outcrops in semidesert grasslands
|elevation=1200-1300 m
|distribution=Tex.
|reference=None
|publication title=Beitr. Sukkulentenk. Sukkulentenpflege
|publication year=1941
|special status=Endemic
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V4/V4_408.xml
|subfamily=Cactaceae subfam. Cactoideae
|genus=Thelocactus
|species=Thelocactus bicolor
|variety=Thelocactus bicolor var. flavidispinus
}}<!--

-->[[Category:Treatment]][[Category:Thelocactus bicolor]]