View source for Mentzelia involucrata

{{Treatment/ID
|accepted_name=Mentzelia involucrata
|accepted_authority=S. Watson
|publications={{Treatment/Publication
|title=Proc. Amer. Acad. Arts
|place=20: 367. 1885
|year=1885
}}
|common_names=Whitebract blazingstar
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Mentzelia involucrata var. megalantha
|authority=I. M. Johnston
|rank=variety
}}
|hierarchy=Loasaceae;Mentzelia;Mentzelia sect. Bicuspidaria;Mentzelia involucrata
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Loasaceae]]</div><div class="higher-taxon"><small>genus</small>[[Mentzelia]]</div><div class="higher-taxon"><small>section</small>[[Mentzelia sect. Bicuspidaria]]</div><div class="higher-taxon"><small>species</small>[[Mentzelia involucrata]]</div></div>
|volume=Volume 12
|mention_page=page 497, 524, 535
|treatment_page=page 525
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>7–35(–45) cm. <b>Basal</b> leaves: petioles present or absent; blade lanceolate, to 10(–16) cm; margins shallowly to deeply lobed, lobes acute. <b>Cauline</b> leaves: petioles absent; blade ovate to lanceolate, to 10(–16) cm, base often cordate-clasping, margins deeply to shallowly lobed, lobes acute. <b>Bracts</b> white with green margins, conspicuous, concealing pedicel, ovary, and capsule. <b>Flowers</b>: petals white to pale yellow, usually with orange veins, obovate, 13–65 mm, apex mucronate; stamens 4–26 mm, less than 1/2 petal length, all fertile, none petaloid (flowers appearing to have 5 petals); filaments ± monomorphic, linear, distally 2-lobed, lobes 0.5–2 mm; anther stalk shorter or longer than filament lobes; style 8–30 mm. <b>Capsules</b> cylindric to cup-shaped, 14–25(–30) × 5–10 mm, erect. <b>Seeds</b> usually constricted proximal to middle; seed coat anticlinal cell walls wavy. <b>2n</b> = 18.</span><!--

-->{{Treatment/Body
|phenology=Flowering Jan–May.
|habitat=Washes, fans, slopes, desert scrub.
|elevation=50–900 m.
|distribution=Ariz.;Calif.;Mexico (Baja California;Sonora).
|discussion=<p><i>Mentzelia involucrata</i> is easily distinguished from other species in sect. Bicuspidaria by its large white bracts, which are strikingly similar to those of <i>M. congesta</i> in sect. Trachyphytum. Phylogenetic studies show that these species are not closely related, suggesting a homoplasious origin of the characteristic (J. M. Brokaw and L. Hufford, 2010). Populations exhibiting petals longer than 3 cm have previously been called var. megalantha. However, a study by G. S. Daniels (1970) suggested that insufficient geographic and morphological discontinuities exist for recognition of varieties.</p><!--
--><p>P. A. Munz (1974) mistakenly cited var. megalantha as <i>Mentzelia involucrata</i> subsp. megalantha I. M. Johnston, a name never validly published.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Mentzelia involucrata
|authority=S. Watson
|rank=species
|parent rank=section
|synonyms=Mentzelia involucrata var. megalantha
|basionyms=
|family=Loasaceae
|phenology=Flowering Jan–May.
|habitat=Washes, fans, slopes, desert scrub.
|elevation=50–900 m.
|distribution=Ariz.;Calif.;Mexico (Baja California;Sonora).
|reference=None
|publication title=Proc. Amer. Acad. Arts
|publication year=1885
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V12/V12_708.xml
|genus=Mentzelia
|section=Mentzelia sect. Bicuspidaria
|species=Mentzelia involucrata
}}<!--

-->[[Category:Treatment]][[Category:Mentzelia sect. Bicuspidaria]]