View source for Echinocactus horizonthalonius

{{Treatment/ID
|accepted_name=Echinocactus horizonthalonius
|accepted_authority=Lemaire
|publications={{Treatment/Publication
|title=Cact. Gen. Sp. Nov.,
|place=19. 1839
|year=1839
}}
|common_names=Blue barrel cactus;visnaga meloncillo
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Echinocactus horizonthalonius var. nicholii
|authority=L. D. Benson
}}
|hierarchy=Cactaceae;Cactaceae subfam. Cactoideae;Echinocactus;Echinocactus horizonthalonius
|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>[[Echinocactus]]</div><div class="higher-taxon"><small>species</small>[[Echinocactus horizonthalonius]]</div></div>
|volume=Volume 4
|mention_page=page 186
|treatment_page=page 189
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>normally unbranched. <b>Stems</b> pale gray-green to bright gray-blue, flat-topped or hemispheric and deep-seated in sub-strate, spheric with age or stoutly short cylindric (remaining hemispheric at high elevations), 4–25(–45) × 8–15(–20) cm; ribs (7–)8(–9), vertical to helically curving around stem, rib crests broadly rounded, uninterrupted or slightly constricted between areoles. <b>Spines</b> (5–)8(–10) per areole, loosely projecting or strongly decurved, pink, gray, tan, or brown, strongly annulate-ridged, subulate, ± flattened, glabrous, generally not hiding stem surface; radial spines 5(–8) per areole, similar to central spines; central spines 1(–3) per areole, 18–43 × 1–2.5(–3) mm, longest spine usually descending, straight or decurved throughout its length. <b>Flowers</b> 5–7 × 5–6.5(–9.5) cm; inner tepals bright rose-pink or magenta, color ± uniform from base to apex, 3 × 1.5 cm, margins entire to serrate; stigma lobes pinkish to olive. <b>Fruits</b> indehiscent or weakly dehiscent through basal abscission pore, pink or red, spheric to ovoid-cylindric, surfaces partly or entirely hidden by hairs from axils of scales and long areolar hairs of stem apex, usually quickly drying to tan shell before seed dispersal, 10–30 mm; scales several, tips dark, spinelike, glabrous. <b>Seeds</b> black or gray, angular or slightly wrinkled, spheric to obovoid, 2–3 mm; testa cell surfaces slightly convex, with weak network pattern of slightly protruding anticlinal cell walls. <b>2n</b> = 22.</span><!--

-->{{Treatment/Body
|phenology=Flowering Apr–Sep.
|habitat=Arid rocky slopes, primarily limestone
|elevation=600-1700(-2500) m
|distribution=Ariz.;N.Mex.;Tex.;Mexico.
|discussion=<p>The Sonoran Desert populations of <i>Echinocactus horizonthalonius</i> have been segregated as <i></i>var.<i> nicholii</i>, but are relatively similar to plants in New Mexico and extreme western Texas. Much greater morphologic diversity exists farther east and in Mexico, where shorter-spined, nearly flat-topped plants, which are more distinctive than the Sonoran Desert populations, have escaped taxonomic distinction.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Echinocactus horizonthalonius
|author=
|authority=Lemaire
|rank=species
|parent rank=genus
|synonyms=Echinocactus horizonthalonius var. nicholii
|basionyms=
|family=Cactaceae
|phenology=Flowering Apr–Sep.
|habitat=Arid rocky slopes, primarily limestone
|elevation=600-1700(-2500) m
|distribution=Ariz.;N.Mex.;Tex.;Mexico.
|reference=None
|publication title=Cact. Gen. Sp. Nov.,
|publication year=1839
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V4/V4_354.xml
|subfamily=Cactaceae subfam. Cactoideae
|genus=Echinocactus
|species=Echinocactus horizonthalonius
}}<!--

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