View source for Hamatocactus

{{Treatment/ID
|accepted_name=Hamatocactus
|accepted_authority=Britton & Rose
|publications={{Treatment/Publication
|title=Cact.
|place=3: 104, figs. 110–114. 1922
|year=1922
}}
|common_names=Twisted-rib cactus
|basionyms=
|synonyms=
|hierarchy=Cactaceae;Cactaceae subfam. Cactoideae;Hamatocactus
|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>[[Hamatocactus]]</div></div>
|etymology=Latin hamatus, hooked, in reference to the hooked central spines, and Cactus, an old genus name
|volume=Volume 4
|mention_page=page 98, 207, 208
|treatment_page=page 218
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>erect, unbranched or branched in basal portion, not deep-seated in substrate. <b>Roots</b> diffuse. <b>Stems</b> unsegmented, bright deep green, hemispheric when young, becoming spheric or ovoid to cylindric, 3.6–12(–20) × 4.5–12 cm, glabrous; ribs 13, spiraling or vertical, slender, crests sinuate, sharp, not interrupted or undulate, narrow; areoles circular or, on older parts of stem, elliptic to ovate, adaxially elongated into short areolar grooves; areolar glands golden, darker with age, cylindric or peglike; cortex and pith firm, not mucilaginous. <b>Spines</b> 11–20 per areole, not obscuring stems, yellowish, whitish, or reddish brown, acicular (rarely central spine flattened), longest spines 12–38 mm; radial spines 10–19 per areole, straight or slightly curved toward stem, longest spines 11–32 mm; central spines 1 per areole, porrect, hooked, terete (rarely flattened). <b>Flowers</b> diurnal, near stem apex, at adaxial edge of areoles or at axillary ends of short areolar grooves, widely funnelform, 3.7–7 × 4–7 cm; outer tepals finely fringed; inner tepals yellow (to ivory) with red bases, 20–25 × 6–9 mm, margins entire, toothed, or lacerate; ovary scaly, hairless, spineless; stigma lobes 5–11, pale yellow to orangish, 3–7 mm. <b>Fruits</b> indehiscent or eventually dehiscent by vertical slits, bright red, spheric or nearly so, ca. 10 × 8–13 mm, fleshy, with 15 or fewer whitish, broad fringed, naked, spineless scales; floral remnant persistent. <b>Seeds</b> black, obovoid, usually 1–1.4 × 0.8–1 mm, minutely papillate; testa cells weakly convex, nearly flat toward proximal end of seed. <b>x</b> = 11.</span><!--

-->{{Treatment/Body
|distribution=Arid regions;sw United States;Mexico.
|discussion=<p>Species 1.</p><!--
--><p><i>Hamatocactus</i> has been submerged in <i>Ferocactus</i> or <i>Thelocactus</i> by various authors and grouped with <i>Glandulicactus</i> by others.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Hamatocactus
|author=Allan D. Zimmerman;Bruce D. Parfitt
|authority=Britton & Rose
|rank=genus
|parent rank=subfamily
|synonyms=
|basionyms=
|family=Cactaceae
|distribution=Arid regions;sw United States;Mexico.
|reference=None
|publication title=Cact.
|publication year=1922
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V4/V4_409.xml
|subfamily=Cactaceae subfam. Cactoideae
|genus=Hamatocactus
}}<!--

-->[[Category:Treatment]][[Category:Cactaceae subfam. Cactoideae]]