Monday, April 25, 2016

Euphorbia albomarginata (Rattlesnake Weed, Rattlesnake Sandmat)

4/27/01 Black Canyon Road north of Mid Hills, Mojave National Preserve (East Mojave),
San Bernardino County, CA

 4/3/17 CA 190W between Emigrant and Towne Pass,
Death Valley National Park, Inyo County, CA

 5/24/98 Desert Tortoise Natural Area, Western Mojave, E. Kern County, CA


COMMON NAME: Rattlesnake Weed, Whitemargin Sandmat

SPECIES: Euphorbia albomarginata

FAMILY: Euphorbiaceae (Spurge Family)


LOCATION: Desert Tortoise Natural Area, Western Mojave, E. Kern County, CA


Treatment from The Jepson Manual (1993):

Habit: Perennial herb, glabrous. 

Stem: prostrate, repeatedly forking, 2-faced. 

Leaf: opposite throughout, 2-ranked, subsessile; stipules fused into wide, membranous, ciliate scale; blade 3--8 mm, round to oblong, entire, base asymmetric, tip obtuse. 

Inflorescence: cyathia generally 1 per node; involucre < 2.5 mm, bell-shaped to obconic; glands 4, < 1 mm, transversely oblong; petal-like appendage wider than gland, entire to slightly scalloped, white. 

Staminate Flower: 15--30. 

Pistillate Flower: styles forked 1/2--3/4. 

Fruit: 2--2.5 mm, ovoid, angled, glabrous. 

Seed: 1--2 mm, oblong, 4-angled, smooth, white; knob 0. 

Ecology: Common. Dry slopes; : < 2300 m. 

Bioregional Distribution: s SnJV, SW, D; 

Distribution Outside California: to Utah, Texas, Mexico. 

Flowering Time: Apr--Nov 

eFlora Treatment Author: David J. Keil, Thomas J. Rosatti, Mark H. Mayfield & Daryl Koutnik

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