Mentzelia collomiae

Christy

Novon 7: 25. 1997.

Common names: Sunset Crater blazingstar
EndemicConservation concern
Treatment appears in FNA Volume 12. Treatment on page 519. Mentioned on page 501.
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Plants biennial, candelabra-form. Stems solitary, erect, straight; branches distal, distal longest, antrorse, straight; hairy. Leaves: blade 17.8–55.2 × 3–16.6(–26.3) mm, widest intersinus distance 1.4–4.9 mm; proximal oblanceolate, lanceolate, or elliptic, margins dentate to pinnate, teeth or lobes 8–18, perpendicular to leaf axis, 0.6–5.3 mm; distal elliptic to lanceolate, base not clasping, margins dentate to pinnate, teeth or lobes 4–12, perpendicular to leaf axis, 0.7–6.8 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. Bracts: margins usually entire, occasionally toothed. Flowers: petals golden yellow, 8.5–16.2 × 2.6–6.4 mm, apex acute to rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, strongly clawed, (6–)9.9–13.8 × (1–)2.4–4.3 mm, without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles (5–)7.8–11 mm. Capsules cylindric, 9.3–16.1 × 3.6–5.9 mm, base tapering, not longitudinally ridged. Seeds: coat anticlinal cell walls sinuous, papillae 51–59 per cell. 2n = 22.


Phenology: Flowering Jun–Aug.
Habitat: Sparsely vegetated level ground, slopes, black (to sometimes reddish) volcanic cinder cone soils.
Elevation: 1300–2500 m.

Discussion

Mentzelia collomiae is known only from the San Francisco Volcanic Field of Coconino County.

Selected References

None.

Lower Taxa

None.
... more about "Mentzelia collomiae"
John J. Schenk +  and Larry Hufford +
Christy +
Mentzelia +
Sunset Crater blazingstar +
1300–2500 m. +
Sparsely vegetated level ground, slopes, black (to sometimes reddish) volcanic cinder cone soils. +
Flowering Jun–Aug. +
Endemic +  and Conservation concern +
Mentzelia collomiae +
Mentzelia sect. Bartonia +
species +