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|Jepson eFlora: Taxon page
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|Family: Loasaceae||View Description||Dichotomous Key|
|Genus: Mentzelia||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Mentzelia jonesii (Urb. & Gilg) H.J. Thomps. & J.E. Roberts
Habit: Annual 5--40 cm. Stem: erect to decumbent, glabrous to hairy. Leaf: < 14 cm, entire to lobed. Inflorescence: bracts lance-ovate, entire, green. Flower: sepals 2--8(10) mm; petals (6)8--22 mm, ovate to obovate, yellow, base yellow to orange; stamens 3--10 mm; style 4--10 mm. Fruit: curved < 180° or S-shaped, 15--38 mm, 2--4 mm wide, obconic. Seed: +- 1 mm, irregular-rounded to irregular-angular above mid-fruit, ×-section occasionally triangular with longitudinal edges grooved below mid-fruit, tan, dark-mottled or not; seed coat cells generally pointed or domed, in age > 1/2 tall as wide on seed surface edges. Chromosomes: 2n=36,54.
Ecology: Sandy to rocky washes, fans, flats, roadsides; Elevation: 200--1450 m. Bioregional Distribution: W&I, D; Distribution Outside California: Nevada, Arizona. Flowering Time: Mar--May Note: Intergrades with Mentzelia nitens, Mentzelia albicaulis. If recognized taxonomically, plants with n=27 assignable to Mentzelia californica H.J. Thomps. & J.E. Roberts (in part).
eFlora Treatment Author: Joshua M. Brokaw, John J. Schenk & Barry Prigge
Jepson Online Interchange
Previous taxon: Mentzelia inyoensis
Next taxon: Mentzelia laevicaulis
Citation for this treatment: Joshua M. Brokaw, John J. Schenk & Barry Prigge 2017. Mentzelia jonesii, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=33248, accessed on February 27, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 27, 2017.