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Flower and fruit

Yavapai County Native & Naturalized Plants

Euphorbia spathulata - warty spurge

Synonyms: Euphorbia alta, Euphorbia arkansana, Euphorbia dictyosperma, Euphorbia obtusata, Galarhoeus arkansanus, Galarhoeus obtusatus
Plant Form: Forb or Subshrub

Family: Euphorbiaceae

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Leaves and fruit
Max Licher @, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)
Max Licher @, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)
Forb Plant Description

Origin: Native   Life Cycle: Annual or perennial
General Desc: The plant usually consists of a single stem from the ground up to the branching flower stems.
Identification notes: Terminal inflorescence in mature plants is 1/4 the total length of the plant or more; capsules warty.
Height: To 18 inches


Habitat Description: Dry, open, generally disturbed places.
Plant Communities: Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Montane Conifer Forest, Disturbed Areas
Elevation: 1500 - 7500 feet

Flower Characteristics

Color: Yellow, green     Shape: Other in clusters     Tubular: N     Flowering Period: Mar - Apr
Description: What appears to be a flower is instead a cyathium, a cup-like structure that houses a central pistillate flower surrounded by several staminate flowers. The yellow horned structures are not true petals but merely extensions of the cyathium.

Leaf and Stem Characteristics

Leaf Color: Green     Leaf Type: Simple     Leaf Shape: Round or oval     Leaf Margin: Toothed     Leaf Attachment: Alternate and opposite     Leaves Clasp: Y
Hairs: No     Spines: N
Leaf Description: Leaf margins are minutely serrate. Stem leaves are alternate to 1-1/2 inches long; floral leaves are opposite and clasping.

Fruit and Seed Characteristics

Fruit Type: Capsule
Fruit Notes: Capsules are less than 1/8 inch long. The surface bears warty nodules.
Seed Notes: Seeds are about 1/16 inch long, brown, spherical, bearing fine nodules.

  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 8.0  
Last Updated: Nov 21, 2021
Content Questions/Comments: Email Mary Barnes  
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