Saturday, February 10, 2018

Oenothera primiveris (Yellow Desert Evening Primrose)

3/26/05 Johnson Valley OHV Area, Ord Mountain turnoff, San Bernardino County, CA


COMMON NAME: Yellow Desert Evening Primrose

SPECIES: Oenothera primiveris

FAMILY: Onagraceae (Evening Primrose Family)


LOCATION: Johnson Valley OHV Area, Ord Mountain turnfoff, San Bernardino County, CA

Jepson eFlora:

Habit: Annual, rosetted, minutely strigose, in inflorescence generally glandular; hairs also coarse, with red, blister-like base or not. 

Stem: generally 0 (sometimes erect or ascending, < 3.5 dm). 

Leaf: 4--28 cm, oblanceolate, wavy-dentate to 1--2-pinnately lobed, green to gray-green. 

Inflorescence: flowers in axils. 

Flower: hypanthium 20--72 mm; sepals 7--30 mm, free tips in bud 0; petals 6--40 mm, yellow fading red-purple to orange. 

Fruit: 10--60 mm, 4--8 mm wide, lanceolate to ovate, straight, curved, or S-shaped. 

Seed: 3--3.5 mm, irregularly obovate to oblanceolate, papillate, 1 side coarsely wrinkled in distal 1/2, other side with thick, U-shaped area forming groove and small cavity at tip. 

Ecology: Sandy flats, low hills, dune margins, arroyos; 

Elevation: 30--1400 m. 

Bioregional Distribution: D; 

Distribution Outside California: to Utah, Texas, northwestern Mexico. 

Flowering Time: Mar--May 

Note: Often self-pollinated, less commonly not. 

eFlora Treatment Author: Warren L. Wagner

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