View source for Coryphantha duncanii

{{Treatment/ID
|accepted_name=Coryphantha duncanii
|accepted_authority=(Hester) L. D. Benson
|publications={{Treatment/Publication
|title=Cact. Succ. J. (Los Angeles)
|place=41: 189. 1969
|year=1969
}}
|common_names=Duncan’s pincushion cactus
|basionyms={{Treatment/ID/Basionym
|name=Escobesseya duncanii
|authority=Hester
|publication_title=Desert Pl. Life
|publication_place=13: 192. 1941
}}
|synonyms={{Treatment/ID/Synonym
|name=Escobaria dasyacantha var. duncanii
|authority=(Hester) N. P. Taylor
}} {{Treatment/ID/Synonym
|name=Escobaria duncanii
|authority=(Hester) Backeberg
}}
|hierarchy=Cactaceae;Cactaceae subfam. Cactoideae;Coryphantha;Coryphantha duncanii
|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>[[Coryphantha]]</div><div class="higher-taxon"><small>species</small>[[Coryphantha duncanii]]</div></div>
|volume=Volume 4
|mention_page=page 222, 223, 230
|treatment_page=page 231
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>unbranched (rarely to 8 mature branches), white bristly spines obscuring stem. <b>Roots</b> dominated by a short or narrowly conic, carrotlike, succulent taproot, 1/3–1/2 of stem diam. <b>Stems</b> deep-seated, inconspicuous, obovoid, ovoid, or spheric to ± conic, 2.5–6 × 1–3.4 cm; tubercles 3–6 × 2.6–4 mm, moderately soft; areolar glands absent; parenchyma not mucilaginous; druses in pith and cortex abundant but nearly microscopic; pith 1/2 of lesser stem diam.; medullary vascular system absent. <b>Spines</b> (21–)31–44(–55) per areole, all snowy white, dark tips (tan to reddish brown) on medium and large spines; radial spines (18–)20–41 per areole, (4–)6–9(–10) × 0.03–0.2 mm; subcentral spines 0–12 per areole; outer central spines (1–)3–9(–17) per areole, appressed or (usually) slightly projecting; inner central spines (spines most likely to be interpreted as central) 0(–1) per areole, ascending, descending, or porrect, straight, longest spines (6–)7–14(–19) × 0.17–0.27 mm. <b>Flowers</b> nearly apical, 15–30 × 13–19 mm; outer tepals conspicuously fringed; inner tepals 14 per flower, margins white or cream (to light pink), midstripes pinkish to brown or brownish green, proximally white, 8–12 × 1.5–3 mm; outer filaments white or pinkish; anthers bright yellow; stigma lobes usually 4, dark green to bright yellow. <b>Fruits</b> bright red throughout, ellipsoid, cylindric, or clavate, 11–20 × 3–5 mm, not very succulent; floral remnant deciduous. <b>Seeds</b> black, ± spheric, ± 1.2 mm, pitted. <b>2n</b> = 22.</span><!--

-->{{Treatment/Body
|phenology=Flowering Feb–Mar(-May); fruiting mostly May.
|habitat=Limestone slopes, mostly in crevices of massive limestone outcrops
|elevation=700-1700 m
|distribution=N.Mex.;Tex.
|discussion=<p>Of conservation concern.</p><!--
--><p><i>Coryphantha duncanii</i> is inconspicuous, difficult to identify, and usually rare. Other coryphanthas in its range have thicker spines, except for <i>C. chaffeyi</i> and <i>C. dasyacantha</i>. <i>Coryphantha duncanii</i> resembles a stunted, crevice-limited growth form of <i>C. dasyacantha</i> but has caducous floral remnant. It is closely related to C. zilziana Boedeker of Mexico.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Coryphantha duncanii
|author=
|authority=(Hester) L. D. Benson
|rank=species
|parent rank=genus
|synonyms=Escobaria dasyacantha var. duncanii;Escobaria duncanii
|basionyms=Escobesseya duncanii
|family=Cactaceae
|phenology=Flowering Feb–Mar(-May); fruiting mostly May.
|habitat=Limestone slopes, mostly in crevices of massive limestone outcrops
|elevation=700-1700 m
|distribution=N.Mex.;Tex.
|reference=None
|publication title=Cact. Succ. J. (Los Angeles)
|publication year=1969
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V4/V4_423.xml
|subfamily=Cactaceae subfam. Cactoideae
|genus=Coryphantha
|species=Coryphantha duncanii
}}<!--

-->[[Category:Treatment]][[Category:Coryphantha]]