Mentzelia goodrichii
Rhodora 95: 407, fig. 14. 1993.
Plants perennial, bushlike, with subterranean caudices or rhizomes. Stems multiple, erect or decumbent, zigzag or straight; branches along entire stem, distal longest, antrorse, straight; hairy. Leaves: blade 23–35.3 × 6.5–13(–16) mm, widest intersinus distance 3.7–11.3 mm; proximal oblanceolate, margins dentate, teeth 4–10, perpendicular to leaf axis, 0.5–1.8 mm; distal elliptic to lanceolate, base not clasping, margins dentate to pinnate, teeth or lobes 4–8, perpendicular to leaf axis, 1.3–3.6 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. Bracts: margins entire. Flowers: petals golden yellow, 16.1–18.5 × 6.7–9.2 mm, apex rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 7.8–9.3 × 2.3–3.3 mm, with anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 6.3–8.6 mm. Capsules cup-shaped, 8–12 × 6–7.2 mm, base rounded, not longitudinally ridged. Seeds: coat anticlinal cell walls straight, papillae 11–15 per cell.
Phenology: Flowering Jul–Aug.
Habitat: Steep slopes composed of Green River Formation shale.
Elevation: 1900–2700 m.
Discussion
Mentzelia goodrichii is known only from Duchesne County.
Selected References
None.