top of page
-
Biennial to short-lived perennial herb, growing up to 1 meter
-
Native to most parts of North America
Curlycup gumweed
(Grindelia squarrosa var serrulata)
Quick Identification
-
Bright yellow flowers
-
Hooked bracts
-
Sticky latex on flower buds, flowers, leaves and stems
-
Smooth, narrow leaves with serrated edges
-
Branching stems
Impact
Impact is unknown at this time, but some believe this species may reduce biodiversity by competing with other plants.
Management
Avoid over grazing to prevent the establishment of this species.
Flower
Bright yellow flowers with a tightly packed centre. Flower heads are covered in
Leaves & Stems
First year basal rosette radiates from central point. Rosette leaves have entire margins, taper towards stalk, and are rounded at the tips. Flowering stalks grow from the rosette during the second year . Stem leaves are lance-shaped with
entire margins, and are alternately arranged. Stem hairs are prickly.
Roots
Stout, black taproot with smaller fibrous lateral roots. Reaches 60cm (2ft) long.
Reproduction & Dispersal
By seeds. Most seeds fall near the parent plant, but seeds also travel though infested gravel, water, animals, heavy machinery and vehicles.
Seeds
Fruit is a cluster of four angular, wrinkled seeds that are grayish-brown when mature. Each plant may produce up to 2,800 seeds.
Preferred Habitat
Found in gravely riparian areas, roadsides, pastures, and meadows at low to mid-elevations. Well-adapted to dry, rocky, sandy or shallow soils, especially glacial till.
Interesting Facts
Typically not eaten by grazing animals easily out competes native species in range land.
bottom of page