Spiny-tooth gumweed

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Spiny-tooth gumweed

Spiny-tooth gummed head

Spiny-tooth gummed leaves

Spiny-tooth gumweed

Spiny-tooth gummed inflorescences

Spiny-tooth gumweed

Spiny-tooth gumweed

Morphology

Stem

Ascending to erect, simple or branched from base or distally, glabrous.

Leaves

Alternate, basal and cauline; petiole absent; narrowly oblanceolate to lanceolate, narrowly elliptic, oblong, or linear, 1.2 to 3.4 inches long, .12 to .6 inch wide, base cuneate to clasping, margins serrate with minutely bristle-tipped teeth, apex acute to acuminate, surfaces not gland-dotted.

Inflorescence

Heads usually in corymb-like arrays, rarely solitary. Involucres urn-shaped to globose, .3 to .6 inch tall, .4 to .8 inch wide. Phyllaries in 5-9 series, lanceolate to linear, apex erect to spreading, outermost sometimes recurved.

Flower

Ray florets 12-36, pistillate, fertile; corolla yellow; ligules .4 to .6 inch. Disk florets 20-300, usually bisexual; corolla yellow, funnelform, lobes 5.

Fruit

Achenes, ellipsoid to obovoid, slightly compressed, .16 to .24 inch; pappus of 2 smooth awns .16 to .28 inch.

Ecology

Habitat

Rocky tallgrass prairies, pastures, and glades

Distribution

Southeast 1/4 of Kansas

Additional Notes