Coahuila Blazingstar (Mentzelia pachyrhiza)
Description
Plants perennial, with tubers. Stems erect, to 50 cm. Leaves: petiole mostly 3-20 mm, less than 3 mm only on smallest, distalmost leaves; blade ovate to hastate, basally lobed or unlobed, to 4 - 3 cm, base usually acute to obtuse, sometimes attenuate or hastate, margins usually serrate, sometimes crenate, apex acute. Pedicels (fruiting) (0-)2 - 2 mm. Flowers: petals orange, 5-11.5 - 3-5 mm, apex acute to rounded, hairy abaxially on distal 1/2; stamens 15-45, 4-8 mm, filaments usually monomorphic, filiform, rarely heteromorphic, outermost slightly spatulate, inner filiform; style 3-7.5 mm. Capsules subcylindric to clavate, 6-10 - 1.5-2.3 mm, base tapering gradually, capsule and pedicel not well-differentiated, walls thin, brittle. Seeds 2-3 per capsule, oblong, with transverse folds. 2N = 22. Flowering May-Nov. Steep limestone cliffs, gravelly slopes of gypseous clayey soils, desert scrub and Larrea communities; 900-2000 m; Tex.; Mexico (Chihuahua, Coahuila, Durango, 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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