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Inyo Blazingstar (Mentzelia inyoensis)

Description

Plants biennial, candelabra-form. Stems solitary, erect, straight; branches usually distal, occasionally along entire stem, distal usually longest, antrorse, straight; hairy. Leaves: blade 16.7-89 - 6.3-14.2(-20) mm, widest intersinus distance 3.1-9.7 mm; proximal oblanceolate to elliptic, margins serrate to pinnate, teeth or lobes 10-24, slightly antrorse, 1.4-3.4 mm; distal lanceolate, base usually not clasping, occasionally clasping, margins serrate to pinnate, teeth or lobes 8-14, slightly antrorse, 0.7-7 mm; abaxial surface with complex grappling-hook, and occasionally simple grappling-hook and needlelike, trichomes, adaxial surface with needlelike and occasionally simple grappling-hook trichomes. Bracts: margins usually entire, sometimes toothed. Flowers: petals golden yellow, 11.7-15.8(-18) - 2-4.8 mm, apex acute, glabrous abaxially; stamens golden yellow, 5 outermost not petaloid, filaments linear, not clawed, 10.2-13.2 - 0.6-1.6 mm, with anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 6.7-13 mm. Capsules usually cylindric, rarely cup-shaped, 10.4-25 - 5.5-8.3 mm, base tapering or rounded, not longitudinally ridged. Seeds: coat anticlinal cell walls straight, papillae 3-6 per cell. 2N = 22. Flowering Jun-Aug. Sparsely vegetated, gravelly slopes, gypsum or ash soils; of conservation concern; 1400-2000 m; Calif., Nev.

Taxonomic tree

  • Domain: Eukarya

    • Kingdom: Plantae

      • Phylum: Magnoliophyta

        • Class: Magnoliopsida

          • Order: Cornales

            • Family: Loasaceae

              • Genus: Mentzelia