View source for Sclerocactus sileri

{{Treatment/ID
|accepted_name=Sclerocactus sileri
|accepted_authority=(L. D. Benson) K. D. Heil & J. M. Porter
|publications={{Treatment/Publication
|title=Haseltonia
|place=2: 39. 1994
|year=1994
}}
|common_names=Siler fishhook cactus
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}{{Treatment/ID/Special_status
|code=C
|label=Conservation concern
}}
|basionyms={{Treatment/ID/Basionym
|name=Sclerocactus pubispinus var. sileri
|authority=L. D. Benson
|rank=variety
|publication_title=Cacti Arizona ed.
|publication_place=3, 23. 179. 1969
}}
|synonyms={{Treatment/ID/Synonym
|name=Pediocactus pubispinus subsp. sileri
|authority=(L. D. Benson) Halda
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=Pediocactus whipplei subsp. busekii
|authority=(Hochstätter) Halda
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=Sclerocactus whipplei subsp. busekii
|authority=Hochstätter
|rank=subspecies
}}
|hierarchy=Cactaceae;Cactaceae subfam. Cactoideae;Sclerocactus;Sclerocactus sileri
|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>[[Sclerocactus]]</div><div class="higher-taxon"><small>species</small>[[Sclerocactus sileri]]</div></div>
|volume=Volume 4
|mention_page=page 198, 199
|treatment_page=page 205
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>unbranched (2-branched), green, depressed-spheric to short cylindric, 4–8.5 × 3–5.5 cm; ribs usually (12–)13(–14), not well developed, tubercles prominent on low ribs. <b>Spines</b> obscuring stems or nearly so; radial spines 6–8(–12) per areole, acicular, elliptic in cross section, 5–15 × 0.5–0.8 mm; central spines 4–5 per areole; abaxial central spines 1–2 per areole, white, gray, or purplish tinged, turned or curving somewhat downward, angled, strongly hooked, slightly contorted, terete to angled, 12–35 × 0.5–1 mm; lateral central spines 2 per areole, similar to abaxial but slightly shorter, usually not hooked; adaxial central spines 1–2 per areole, erect, recurved, white to tan, strongly flattened, conspicuous, 13–40 × 0.8–2 mm. <b>Flowers</b> funnelform to campanulate, 2.5–3 × 2–3 cm; outer tepals with brownish and yellowish margins, larger oblanceolate, 10–17 × 5–8 mm, apex mucronate, margins membranous, crisped or minutely toothed; inner tepals yellow, sometimes suffused with brown, largest tepals oblanceolate, 15–25 × 5–7 mm, apex mucronate; filaments white to greenish white; anthers yellow; styles minutely but densely papillate Fruits dehiscent along 2–4 vertical slits, green, turning red to tan, ovoid, 8–25 × 8–14(–22) mm, dry; scales few, membranous, scarious-margined, minutely toothed or fringed. <b>Seeds</b> black to light brown, 2.7–3 × 2.2–2.5 mm; testa with rounded papillae.</span><!--

-->{{Treatment/Body
|phenology=Flowering late Apr–May.
|habitat=Silty sand or clay soils, often with gravel, grama grasslands with dropseed, yucca, hedgehog cactus, sagebrush, and snakeweed, pinyon-juniper woodlands
|elevation=1600-1700 m
|distribution=Ariz.
|discussion=<p>Of conservation concern.</p><!--
--><p>As far as is known, based on field investigations and herbarium collections, <i>Sclerocactus sileri</i> is restricted to northeast Coconino County, Arizona. This enigmatic cactus shares morphologic characteristics with both <i>Sclerocactus whipplei</i> (F. Hochstätter 1996) and <i>S. pubispinus</i>. The floral morphology and color is reminiscent of <i>S. whipplei</i>; however, the adaxial central spine morphology and fruit dehiscence is much like that found in <i>S. pubispinus</i> and <i>S. spinosior</i>. Phylogenetic analyses of chloroplast DNA sequences (J. M. Porter et al. 2000) provided evidence that <i>S. sileri</i> is the sister taxon to a clade including <i>S. brevispinus</i>, <i>S. whipplei</i>, <i>S. cloverae</i>, <i>S. glaucus</i>, <i>S. parviflorus</i>, <i>S. wetlandicus</i>, and <i>S. wrightiae</i>. Therefore, there is no support for immediate links between <i>S. sileri</i> and either <i>S. whipplei</i> or <i>S. pubispinus</i>.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Sclerocactus sileri
|authority=(L. D. Benson) K. D. Heil & J. M. Porter
|rank=species
|parent rank=genus
|synonyms=Pediocactus pubispinus subsp. sileri;Pediocactus whipplei subsp. busekii;Sclerocactus whipplei subsp. busekii
|basionyms=Sclerocactus pubispinus var. sileri
|family=Cactaceae
|phenology=Flowering late Apr–May.
|habitat=Silty sand or clay soils, often with gravel, grama grasslands with dropseed, yucca, hedgehog cactus, sagebrush, and snakeweed, pinyon-juniper woodlands
|elevation=1600-1700 m
|distribution=Ariz.
|reference=None
|publication title=Haseltonia
|publication year=1994
|special status=Endemic;Conservation concern
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V4/V4_383.xml
|subfamily=Cactaceae subfam. Cactoideae
|genus=Sclerocactus
|species=Sclerocactus sileri
}}<!--

-->[[Category:Treatment]][[Category:Sclerocactus]]