Mentzelia montana (A. Davids.) A. Davids.
Family: Loasaceae
[Acrolasia montana Davidson]
Mentzelia montana image
Liz Makings  
PLANTS: Annuals. STEMS: to 50 cm tall. LEAVES: to 10 cm long, sessile, narrowly elliptic to lanceolate or nearly linear; margins often entire, the lowest toothed to lobed, occasionally lobed throughout. BRACTS: narrowly lanceolate to ovate or obovate, with whitish bases, commonly on ovary; margins mostly entire or few-toothed on later flowers. FLOWERS: sessile or short-pedicellate; petals yellow, 2.5-10 mm long, 2-5 mm wide; staminodia 0; stamens ca. 10-30, all with linear filaments; style 1.5-7 mm long. CAPSULES: clavate to nearly cylindric, mostly tapering only near base; base not woody; body 10-16 (-20) mm long, when mature straight. SEEDS: pendulous, not winged, those in upper half of capsule grain-like, several-faceted, irregular in cross-section, the angles sharp; testa cells with straight adjoining walls, the surface walls pointed-papillate. 2n = 36. NOTES: Disturbed and open areas, from chaparral to pine woodlands (Map 4A): Apache, Cochise, Coconino, Mohave, Navajo, Pima, Santa Cruz, Yavapai cos; 900-2350 m (3000-7700 ft); Apr-Jun; CA, CO, NM, OR, TX, UT; n Mex. Best recognized by its erect, straight fruits that taper only near the base and its white-based bracts. The branches below the earliest flower are commonly alternate and less well-developed than those from lower nodes; most taxa in section Trachyphytum have mostly opposite and well-developed branches immediately subtending the earliest flower. This species generally looks like a less-robust version of M. veatchiana. It apparently intergrades in AZ with M. albicaulis and M. veatchiana. REFERENCES: Christy, Charlotte M. 1998. Loasaceae. J. Ariz. - Nev. Acad. Sci. 30(2): 96.
Mentzelia montana image
Patrick Alexander  
Mentzelia montana image
Patrick Alexander  
Mentzelia montana image
Patrick Alexander  
Mentzelia montana image
Patrick Alexander  
Mentzelia montana image
Liz Makings  
Mentzelia montana image
Patrick Alexander  
Mentzelia montana image
Sue Carnahan  
Mentzelia montana image
Sue Carnahan  
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