Common Name: LOASA FAMILY Habit: Annual to subshrub; hairs needle-like, barbed, occasionally stinging. Leaf: alternate [opposite], generally +- pinnate-lobed; stipules 0. Inflorescence: cyme, raceme. Flower: bisexual, radial; sepals generally 5, generally persistent; petals generally 5, free or fused to each other or filament tube; stamens 5--many, filaments thread-like to flat, occasionally fused at base or in clusters; petal-like staminodes occasionally present; pistil 1, ovary inferior, chamber generally 1, placentas generally 3, parietal, style 1. Fruit: capsule or achene. Seed: 1--many. Genera In Family: 18+ genera, 250 species: especially America (Africa, Pacific). eFlora Treatment Author: Larry Hufford & Barry Prigge, except as noted Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Common Name: BLAZING STAR Habit: Annual to perennial herb, sometimes subshrub-like; hairs barbed to needle-like, not stinging; stems pale pink or generally +- white, branched or not. Leaf: linear to ovate, entire to pinnate-lobed; basal in rosettes, generally petioled; cauline generally sessile, +- reduced distally on stem. Inflorescence: generally cyme (or flower 1); bracts green to white-centered, margin green. Flower: sepals lanceolate to deltate, persistent; petals generally 5, free, white to yellow or orange; stamens generally many, +- free, generally unequal, inner filaments generally thread-like; outermost stamens opposite sepal lobes often modified, +- widened, or petal-like, with or without anthers or not; ovary generally cylindric, placentas generally 3, style thread-like, stigma 3-furrowed or -lobed. Fruit: capsule, cup-, barrel-, or urn-shaped to narrowly cylindric, occasionally curved. Seed: generally many, shape variable, sometimes winged.
eFlora Treatment Author: Joshua M. Brokaw, John J. Schenk, Barry Prigge & David Keil Reference: Schenk & Hufford 2020 Syst Bot Monogr 110:1--230
Mentzelia desertorum (Davidson) H.J. Thomps. & J.E. Roberts
NATIVE Habit: Annual 5--41 cm. Stem: erect, glabrous to hairy. Leaf: 1--12 cm, proximal toothed to lobed, distal entire to lobed. Inflorescence: bracts lanceolate to ovate, generally entire, green. Flower: sepals 2--4 mm; petals 2.5--6 mm, ovate to obovate, yellow, base yellow to orange; stamens = style; style 2--4 mm. Fruit: generally curved < 180°, 12--27 mm, 1--2.5 mm wide, obconic; seed rows +- 3 distal to mid-fruit. Seed: +- 1 mm, irregular-rounded to -angular distal to mid-fruit, ×-section occasionally triangular with grooves along longitudinal edges proximal to mid-fruit, tan, not or sparsely dark-mottled; seed coat cells generally flat-surfaced in age. Chromosomes: 2n=18. Ecology: Sandy flats in creosote-bush scrub; Elevation: < 950 m. Bioregional Distribution: D; Distribution Outside California: Baja California. Flowering Time: Feb--Mar Note: Intergrades with Mentzelia obscura. Jepson eFlora Author: Joshua M. Brokaw, John J. Schenk, Barry Prigge & David Keil Reference: Schenk & Hufford 2020 Syst Bot Monogr 110:1--230 Index of California Plant Names (ICPN; linked via the Jepson Online Interchange) Previous taxon: Mentzelia crocea Next taxon: Mentzelia dispersa
Botanical illustration including Mentzelia desertorum
Citation for this treatment: Joshua M. Brokaw, John J. Schenk, Barry Prigge & David Keil 2023, Mentzelia desertorum, in Jepson Flora Project (eds.) Jepson eFlora, Revision 12, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=33235, accessed on December 01, 2024.
Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on December 01, 2024.
No expert verified images found for Mentzelia desertorum.
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