View source for Mentzelia obscura

{{Treatment/ID
|accepted_name=Mentzelia obscura
|accepted_authority=H. J. Thompson & J. E. Roberts
|publications={{Treatment/Publication
|title=Phytologia
|place=21: 284. 1971
|year=1971
}}
|common_names=Pacific blazingstar
|basionyms=
|synonyms=
|hierarchy=Loasaceae;Mentzelia;Mentzelia sect. Trachyphytum;Mentzelia obscura
|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 obscura]]</div></div>
|volume=Volume 12
|mention_page=page 532, 534, 536
|treatment_page=page 540
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>candelabra-form, 8–45 cm. <b>Basal</b> leaves persisting; petiole present or absent; blade linear-lanceolate to linear, margins usually irregularly deeply lobed, lobes pointed. <b>Cauline</b> leaves: petiole absent; blade ovate-lanceolate to linear, to 15(–22) cm, margins few-lobed or entire. <b>Bracts</b> green, ovate to ovate-lanceolate, 2.9–8.2 × 1.1–1.9 mm, width 1/8–1/2 length, not concealing capsule, margins entire. <b>Flowers</b>: sepals 2–6 mm; petals yellow to orange proximally, yellow distally, 3–8 mm, apex rounded or acute apex; stamens 20–40, 2–7 mm, filaments monomorphic, filiform, unlobed; styles 2–6 mm. <b>Capsules</b> clavate, 11–31 × 1.5–3 mm, axillary curved to 250° at maturity, usually inconspicuously longitudinally ribbed. <b>Seeds</b> 15–50, in 2+ rows distal to mid fruit, tan, usually not, occasionally sparsely, dark-mottled, usually irregularly polygonal, occasionally triangular prisms proximal to mid fruit, surface colliculate 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> = 36.</span><!--

-->{{Treatment/Body
|phenology=Flowering Feb–May.
|habitat=Sandy to rocky washes or slopes, desert scrub, Joshua-tree woodlands, roadsides.
|elevation=200–1700 m.
|distribution=Ariz.;Calif.;Nev.;Utah;Mexico (Baja California;Sonora).
|discussion=<p><i>Mentzelia obscura</i> is morphologically intermediate to <i>M. desertorum</i> and <i>M. albicaulis</i> and is known to occur in mixed populations with both species. Reliable discrimination among these species usually requires mature seeds.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Mentzelia obscura
|authority=H. J. Thompson & J. E. Roberts
|rank=species
|parent rank=section
|synonyms=
|basionyms=
|family=Loasaceae
|phenology=Flowering Feb–May.
|habitat=Sandy to rocky washes or slopes, desert scrub, Joshua-tree woodlands, roadsides.
|elevation=200–1700 m.
|distribution=Ariz.;Calif.;Nev.;Utah;Mexico (Baja California;Sonora).
|reference=None
|publication title=Phytologia
|publication year=1971
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V12/V12_1066.xml
|genus=Mentzelia
|section=Mentzelia sect. Trachyphytum
|species=Mentzelia obscura
}}<!--

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