Reverchon's Blazingstar (Mentzelia reverchonii)
Description
Plants biennial or perennial, candelabra-form, perennials with ground-level caudices. Stems solitary, erect, straight; branches distal, distal longest, antrorse, straight to upcurved; hairy. Leaves: blade 24.2-54 - 6.6-29 mm, widest intersinus distance 5.4-13.5(-22.4) mm; proximal oblanceolate to elliptic, margins dentate to pinnate, teeth or lobes 10-20, perpendicular to leaf axis, 1.1-5 mm; distal lanceolate, base not clasping, margins dentate, teeth 8-14, perpendicular to leaf axis, 0.6-3.8 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and occasionally needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. Bracts: margins usually toothed, occasionally entire. Flowers: petals golden yellow, (9.6-)11.1-14.1(-22) - 2.5-4.2(-5.5) mm, apex acute to rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 9.4-13.4(-20) - 2.2-3.7(-5) mm, without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 8.7-11.4(-13) mm. Capsules usually cylindric, rarely cup-shaped, 9.4-22 - 6-9.1 mm, length usually more than, occasionally a few slightly less than, 2 times diam., base tapering, not longitudinally ridged. Seeds: coat anticlinal cell walls straight, papillae 5-7 per cell. 2N = 18. Flowering Apr-Oct. Grasslands on eroded riverbanks, roadsides, roadcuts, sparsely vegetated hillside slopes, sandy, gravelly, clayey, occasionally gypsum soils; 50-600 m; Colo., N.Mex., Okla., Tex.; Mexico (Coahuila, Nuevo Le-n).
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum: Magnoliophyta
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Class: Magnoliopsida
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Order: Cornales
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Family: Loasaceae
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Genus: Mentzelia
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