View source for Mentzelia micrantha

{{Treatment/ID
|accepted_name=Mentzelia micrantha
|accepted_authority=(Hooker & Arnott) Torrey & A. Gray
|publications={{Treatment/Publication
|title=Fl. N. Amer.
|place=1: 535. 1840
|year=1840
}}
|common_names=San Luis or chaparral blazingstar
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms={{Treatment/ID/Basionym
|name=Bartonia micrantha
|authority=Hooker & Arnott
|rank=species
|publication_title=Bot. Beechey Voy.,
|publication_place=343, plate 85. 1839
}}
|synonyms=
|hierarchy=Loasaceae;Mentzelia;Mentzelia sect. Trachyphytum;Mentzelia micrantha
|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. Trachyphytum]]</div><div class="higher-taxon"><small>species</small>[[Mentzelia micrantha]]</div></div>
|volume=Volume 12
|mention_page=page 498, 531, 532
|treatment_page=page 538
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>wandlike or candelabra-form, 10–80 cm. <b>Basal</b> leaves persisting; petiole present or absent; blade lanceolate to linear, margins irregularly deeply lobed to dentate. <b>Cauline</b> leaves: petiole present or absent (proximal leaves), absent (distal leaves); blade lanceolate to linear (proximal leaves), orbiculate to lanceolate (distal leaves), to 18 cm, margins irregularly deeply lobed to dentate proximally, dentate or entire distally. <b>Bracts</b> green, orbiculate to ovate, 3.4–6.6 × 2.5–5.9 mm, width 3/4 to ± equal length, often concealing capsule, margins sinuate or entire. <b>Flowers</b>: sepals 1–3 mm; petals yellow, 2-5 mm, apex acute; stamens 10–20, 1.5–4 mm, filaments heteromorphic, 5 outermost elliptic, distally 2-lobed, inner filiform, unlobed; styles 2–3(–5) mm. <b>Capsules</b> cylindric, 6–13 × 1.5–2.5 mm, axillary curved to 20° at maturity, usually inconspicuously, occasionally prominently, longitudinally ribbed. <b>Seeds</b> 4–10, in 1 row distal to mid fruit, dark brown or tan, dark-mottled, triangular prisms, surface ±smooth to minutely tessellate under 10× magnification; recurved flap over hilum absent; seed coat cell outer periclinal wall flat. <b>2n</b> = 18.</span><!--

-->{{Treatment/Body
|phenology=Flowering Apr–Jun.
|habitat=Open, often recently-burned or disturbed chaparral or oak woodlands.
|elevation=0–2300 m.
|distribution=Calif.;Mexico (Baja California).
|discussion=<p><i>Mentzelia micrantha</i> is easily distinguished from other species in sect. Trachyphytum by the presence of two lateral lobes on the filaments of the five outermost stamens. This characteristic is distinct from the filament lobes of some species in sect. Bicuspidaria, which occur on all or most stamens. Phylogenetic studies have found that <i>M. micrantha</i> is not closely related to species in sect. Bicuspidaria (L. Hufford et al. 2003; J. M. Brokaw and Hufford 2010).</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Mentzelia micrantha
|authority=(Hooker & Arnott) Torrey & A. Gray
|rank=species
|parent rank=section
|synonyms=
|basionyms=Bartonia micrantha
|family=Loasaceae
|phenology=Flowering Apr–Jun.
|habitat=Open, often recently-burned or disturbed chaparral or oak woodlands.
|elevation=0–2300 m.
|distribution=Calif.;Mexico (Baja California).
|reference=None
|publication title=Fl. N. Amer.
|publication year=1840
|special status=Illustrated
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V12/V12_448.xml
|genus=Mentzelia
|section=Mentzelia sect. Trachyphytum
|species=Mentzelia micrantha
}}<!--

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