Plant Image
Flower and fruit


Yavapai County Native & Naturalized Plants

Euphorbia bilobata - blackseed spurge

Synonyms: Zygophyllidium bilobatum
Plant Form: Forb or Subshrub

Family: Hydrophyllaceae


   
 
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Leaves and fruit
Patrick Alexander @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)
Plant
Sue Carnahan @http://swbiodiversity.org, Usage Rights: CC BY-NC (Attribution-Non-Commercial)
Fruit
Sue Carnahan @http://swbiodiversity.org, Usage Rights: CC BY-NC (Attribution-Non-Commercial)
Forb Plant Description

Origin: Native   Life Cycle: Annual
General Desc: Slender, erect, short, soft hairs; usually arising from single stem, much branched, stems branching in 2s; narrow, smooth leaves; flower clusters of 5 small bracts, 5 nectar glands, 5 male flowers around single female flower; white petal-like appendages.Â
Identification notes: Abundant in wet years, slender erect annual; flower clusters of 1 female, 5 male flowers, white, triangular petal-like appendages, deeply 2-lobed, green glands; leaves to 2 inches long, ends narrow, margins smooth, opposite, stipules gland-like.
Height: 8 to 16 inches


Habitat

Habitat Description: Sandy and rocky soils on slopes and canyon bottoms in pine-juniper woodlands, oak woodlands, grasslands, creekbeds and on moist slopes.
Plant Communities: Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Riparian
Elevation: 3500 - 6000 feet


Flower Characteristics

Color: White     Shape: Regular in round clusters     Tubular: N     Flowering Period: Aug - Oct
Description: Flower clusters at leaf nodes, 5 bracts form a cup-like base which contains 5 nectar glands, 1 female flower surrounded by 5 male flowers; white petal-like appendages, twice as long as glands, bilobed (deeply 2-lobed), divided in 2 parts at base.


Leaf and Stem Characteristics

Leaf Color: Green     Leaf Type: Simple     Leaf Shape: Narrow     Leaf Margin: Smooth     Leaf Attachment: Opposite     Leaves Clasp: N
Hairs: Leaves and stems     Spines: N
Leaf Description: Opposite, narrow with pointed tip, smooth margins without teeth, 1/4 to 2 inches long; top of leaf sparsely covered with stiff bristles to fine, silky hairs; bottom surface usually smooth; no venation, only midvein conspicuous.


Fruit and Seed Characteristics

Fruit Color: Green   
Fruit Type: Capsule
Fruit Notes: Smooth capsules.
Seed Notes: Seeds brown to grayish-black, narrowly egg-shaped, 3- or 4-angled in cross section, sometimes obscurely so, tuberculate (covered with warts), often with shallow depressions. 



  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 8.0  
http://cales.arizona.edu/yavapaiplants/SpeciesDetailForb.php  
Last Updated: Dec 13, 2022
Content Questions/Comments: Email Matt Halldorson  
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