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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 obscura H.J. Thomps. & J.E. Roberts
Habit: Annual 8--45 cm. Stem: erect to decumbent, glabrous to hairy. Leaf: 1--22 cm; entire to lobed. Inflorescence: bracts generally ovate, entire, green. Flower: sepals 2--6 mm; petals 3--7(8) mm, ovate to occasionally obovate, yellow, base yellow to orange; stamens 2--7 mm; style 2--6 mm. Fruit: curved < 250°, 11--31 mm, 1.5--3 mm wide, obconic. Seed: +- 1 mm, irregularly rounded above mid-fruit, ×-section occasionally triangular with grooves along longitudinal edges below mid-fruit, tan, not or sparsely dark-mottled; seed coat cells domed, < 1/2 tall as wide in age. Chromosomes: 2n=36.
Ecology: Sandy to rocky washes, slopes, roadsides, creosote-bush scrub, blackbush scrub, Joshua-tree woodland; Elevation: 200--1616 m. Bioregional Distribution: D; Distribution Outside California: to Utah, Arizona, northern Mexico. Flowering Time: Feb--Mar Note: Intergrades with Mentzelia desertorum, Mentzelia albicaulis.
eFlora Treatment Author: Joshua M. Brokaw, John J. Schenk & Barry Prigge
Jepson Online Interchange
Previous taxon: Mentzelia nitens
Next taxon: Mentzelia oreophila
Citation for this treatment: Joshua M. Brokaw, John J. Schenk & Barry Prigge 2017. Mentzelia obscura, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=33269, accessed on February 24, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 24, 2017.