Mentzelia sivinskii
Madroño 57: 253, fig. 4A. 2010.
Plants biennial, bushlike or candelabra-form. Stems solitary, erect, straight; branches distal or along entire stem, distal or proximal longest, antrorse, straight; hairy. Leaves: blade 32.8–112.2 × 2.9–11.4 mm, widest intersinus distance 1–2.9 mm; proximal oblanceolate to elliptic, margins pinnate, lobes 18–24, perpendicular to leaf axis, 0.8–4 mm; distal elliptic to lanceolate, base not clasping, margins pinnate, lobes 6–16, perpendicular to leaf axis, 1–5.1 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and needlelike trichomes, adaxial surface with needlelike and occasionally simple grappling-hook trichomes. Bracts: margins entire. Flowers: petals light to golden yellow, 9–14.7 × 3.1–6.4 mm, apex rounded, glabrous abaxially; stamens light to golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 6.3–11.5 × 2.4–4.9 mm, with anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 4.6–9.9 mm. Capsules cupshaped, 8.2–12.7 × 5.1–7.7 mm, base tapering to rounded, not longitudinally ridged. Seeds: coat anticlinal cell-walls sinuous, papillae 12–21 per cell. 2n = 18.
Phenology: Flowering Jun–Aug.
Habitat: Knolls, slopes, and grassland roadsides, gypsum or brown clayey soils.
Elevation: 1500–1900 m.
Discussion
Mentzelia sivinskii is known from La Plata County, Colorado, and Rio Arriba and San Juan counties, New Mexico.
Selected References
None.
Lower Taxa
No values specified."longest" is not a number."not elongating" is not a number.