Plant Image
Watson lake - SS

Yavapai County Native & Naturalized Plants

Grindelia nuda - curlytop gumweed

Synonyms: Grindelia nuda var. aphanactis
Other Common Names: rayless gumweed
Plant Form: Forb

Family: Asteraceae

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Watson lake
Flower bracts
Watson lake
Leaf attachment
Watson lake
Watson lake
Plant - summer
Watson lake
Forb Plant Description

Origin: Introduced   Life Cycle: Annual
General Desc: Annual or biennial. Sticky-gummy plant; herbage oozing white goo. Recognizable by its absence of ray flowers.
Height: To 16 inches


Habitat Description: Grasslands, interior chaparral, woodlands of oak/pinyon pine/juniper, montane; dry open areas, overgrazed land.
Plant Communities: Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Montane Conifer Forest, Disturbed Areas
Elevation: 5000 - 7000 feet

Flower Characteristics

Color: Yellow     Shape: Daisy or Dandelion-like not in clusters     Tubular: N     Flowering Period: Jun - Oct
Description: Yellow, rayless. ball-shaped flowerhead of rounded, linear, semi-hooked, sticky bracts; to 1-1/4 inches wide.

Leaf and Stem Characteristics

Leaf Color: Dark green     Leaf Type: Simple     Leaf Shape: Narrow     Leaf Margin: Toothed     Leaf Attachment: Alternate     Leaves Clasp: Y
Hairs: No     Spines: N
Leaf Description: Variable shaped leaves, from oval to spoon-shaped, 1 to 3 inches long, with course-toothed edges. Middle and top leaves alternately clasp the multi-branched reddish stem.

Fruit and Seed Characteristics

Fruit Type: Achene

  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 3.1  
Last Updated: June 15, 2013  
Content Questions/Comments: Email Jeff Schalau  
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