View source for Mentzelia thompsonii

{{Treatment/ID
|accepted_name=Mentzelia thompsonii
|accepted_authority=Glad
|publications={{Treatment/Publication
|title=Madroño
|place=23: 289, figs. 2A,B. 1976
|year=1976
}}
|common_names=Thompson’s stickleaf
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}{{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms={{Treatment/ID/Basionym
|name=Acrolasia humilis
|authority=Osterhout
|rank=species
|publication_title=Bull. Torrey Bot. Club
|publication_place=49: 183. 1922
}}
|synonyms={{Treatment/ID/Synonym
|name=A. thompsonii
|authority=(Glad) W. A. Weber
|rank=species
}}
|hierarchy=Loasaceae;Mentzelia;Mentzelia sect. Trachyphytum;Mentzelia thompsonii
|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 thompsonii]]</div></div>
|volume=Volume 12
|mention_page=page 532, 543
|treatment_page=page 542
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>wandlike or candelabra-form, 5–20 cm. <b>Basal</b> leaves not persisting. <b>Cauline</b> leaves: petiole present or absent (proximal leaves), absent (distal leaves); blade ovate to linear (proximal leaves), ovate to lanceolate (distal leaves), to 6 cm, margins entire. <b>Bracts</b> green, elliptic to oblanceolate, 3.3–6.2 × 1.5–3.2 mm, width 1/4–7/8 length, not concealing capsule, margins entire. <b>Flowers</b>: sepals 1–3 mm; petals yellow, 2–4 mm, apex retuse to rounded; stamens 10–30, 2–3.5 mm, filaments monomorphic, filiform, unlobed; styles 1.5–3 mm. <b>Capsules</b> cylindric or clavate, 5–16(–20) × 2–4 mm, axillary curved to 45° at maturity, often prominently longitudinally ribbed. <b>Seeds</b> 10–25, in 2+ rows distal to mid fruit, tan, dark-mottled, irregularly polygonal, surface smooth to minutely tessellate under 10× magnification; recurved flap over hilum absent; seed coat cell outer periclinal wall domed, domes on seed edges less than 1/2 as tall as wide at maturity. <b>2n</b> = 18.</span><!--

-->{{Treatment/Body
|phenology=Flowering Apr–Jun.
|habitat=Barren clay to silt slopes, usually on Mancos Shale barrens.
|elevation=1300–2000 m.
|distribution=Colo.;N.Mex.;Utah.
|discussion=<p><i>Mentzelia thompsonii</i> was originally described as Acrolasia humilis, which has caused some confusion with <i>M. humilis</i> (A. Gray) J. Darlington of sect. Bartonia (J. J. Schenk 2009). Subsequently, <i>M. thompsonii</i> was incorrectly treated as a synonym of <i>M. humilis</i> by J. T. Kartesz and C. A. Meacham (1999), leading to lack of recognition of this easily distinguished species in several plant databases and herbaria. <i>Mentzelia thompsonii</i> is distributed predominantly along the Colorado-Utah border south to the Four Corners region.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Mentzelia thompsonii
|authority=Glad
|rank=species
|parent rank=section
|synonyms=A. thompsonii
|basionyms=Acrolasia humilis
|family=Loasaceae
|phenology=Flowering Apr–Jun.
|habitat=Barren clay to silt slopes, usually on Mancos Shale barrens.
|elevation=1300–2000 m.
|distribution=Colo.;N.Mex.;Utah.
|reference=None
|publication title=Madroño
|publication year=1976
|special status=Illustrated;Endemic
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V12/V12_527.xml
|genus=Mentzelia
|section=Mentzelia sect. Trachyphytum
|species=Mentzelia thompsonii
}}<!--

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