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Helenium amarum var. amarum (Raf.) H.Rock

Kingdom: Plantae Rank: Variety Parent: amarum Status: Invalid Reason: unverified

Common Names:

  • BITTERWEED - English, United States of America

Morphological Description

Diagnosis: Disk corollas yellow with lobes yellow to yellow-brown; lower and basal leaves typically withered at flowering time; basal leaves entire to toothed to occasionally pinnatifid.


Ecology: This species is toxic in nature.

Notes: Se and e TX w to Rolling Plains and Edwards Plateau, mostly e of 100th meridian. May–Nov. The foliage is extremely bitter, largely avoided by livestock, and thus greatly increasing under conditions of overgrazing; conspicuously dominant on abused pastures. May–Nov. [H. tenuifolium Nutt.] All parts of the plant contain the glycoside dugaldin and cause toxic symptons in animals; cows that have eaten even small amounts of the plant produce extremely bitter, distasteful milk; honey made from the flowers is also reportedly bitter (Correll & Johnston 1970; Stephens 1980; Ajilvsgi 1984).