View source for Mammillaria macdougalii

{{Treatment/ID
|accepted_name=Mammillaria macdougalii
|accepted_authority=Rose
|publications={{Treatment/Publication
|title=in L. H. Bailey, Stand. Cycl. Hort.
|place=4: 1982. 1916
|year=1916
}}
|common_names=Cream cactus
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Mammillaria gummifera var. macdougalii
|authority=(Rose) L. D. Benson
|rank=variety
}} {{Treatment/ID/Synonym
|name=Mammillaria heyderi var. macdougalii
|authority=(Rose) L. D. Benson
|rank=variety
}}
|hierarchy=Cactaceae;Cactaceae subfam. Cactoideae;Mammillaria;Mammillaria macdougalii
|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>[[Mammillaria]]</div><div class="higher-taxon"><small>species</small>[[Mammillaria macdougalii]]</div></div>
|volume=Volume 4
|mention_page=page 249, 250
|treatment_page=page 257
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>unbranched, deeply seated in substrate. <b>Roots</b> short, obconic taproots; secondary roots diffuse. <b>Stems</b> usually flat-topped (in old age or under dense brush hemispheric), 4–20 × 9-25(–30) cm, firm; tubercles 10–17 × 6–8.5 mm; axils woolly, wool 5–8 mm, bristles absent; cortex and pith not mucilaginous; latex sticky white, abundant in healthy tissue throughout cortex of stem, tubercles, and sometimes flower receptacles. <b>Spines</b> 11–14(–16) per areole, white to straw yellow, glabrous; radial spines 10–12 per areole, whitish to pale yellowish tan, needlelike, 20 mm, stiff; central spines 1–2(–4) per areole, ± porrect or 1 ascending and 1 descending, straight or slightly curved, 10 mm; subcentral spines 0. <b>Flowers</b> 3–4 × 2.5–3.5 cm; outermost tepal margins densely minutely fimbriate (at 10×); inner tepals greenish white to greenish yellow, 14–17(–25) × 2–3 mm; stigma lobes yellow-green to pale green, 2–3 mm. <b>Fruits</b> whitish green proximally, pale green distally with pale rose-purple on sunlit portions, obovoid to clavate, 15–26 × 7.5–15 mm, juicy only in fruit walls; floral remnant persistent. <b>Seeds</b> reddish brown or orange, 1.1–1.3 × 0.9 × 0.8 mm, pitted; testa intermediate, anticlinal cell walls undulate, interstices much narrower than pit diam., pits deeply concave, elongate. <b>2n</b> = 22.</span><!--

-->{{Treatment/Body
|phenology=Flowering Mar–May; fruiting Oct–Mar.
|habitat=Rocky slopes and ridges, ecotone between Sonoran desert scrub and chaparral, oak woodlands, grasslands
|elevation=1100-1800 m
|distribution=Ariz.;Mexico (Sonora).
|discussion=<p><i>Mammillaria macdougalii</i> is the characteristic flat-topped mammillaria of the mountains near Tucson and Nogales, Arizona. Records from farther east are all (insofar as can be determined) misidentifications of <i>M. heyderi </i>var.<i> bullingtoniana</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Mammillaria macdougalii
|authority=Rose
|rank=species
|parent rank=genus
|synonyms=Mammillaria gummifera var. macdougalii;Mammillaria heyderi var. macdougalii
|basionyms=
|family=Cactaceae
|phenology=Flowering Mar–May; fruiting Oct–Mar.
|habitat=Rocky slopes and ridges, ecotone between Sonoran desert scrub and chaparral, oak woodlands, grasslands
|elevation=1100-1800 m
|distribution=Ariz.;Mexico (Sonora).
|reference=None
|publication title=in L. H. Bailey, Stand. Cycl. Hort.
|publication year=1916
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V4/V4_472.xml
|subfamily=Cactaceae subfam. Cactoideae
|genus=Mammillaria
|species=Mammillaria macdougalii
}}<!--

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