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 Echinocactus horizonthalonius have been segregated as var. nicholii, 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/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V4/V4_354.xml
|subfamily=Cactaceae subfam. Cactoideae
|genus=Echinocactus
|species=Echinocactus horizonthalonius
}}<!--

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