Tanacetum parthenium (L.) Schultz-Bip.

Family: Asteraceae, Tribe: Anthemideae

Pertinent Synonyms & Notes (particularly those used in California; go to GRIN for other synonyms)

Matricaria parthenium L.

Pertinent Common Names (particularly those used in California; go to GRIN for other common names)


Primary Disseminule Type

fruit (sometimes with corolla still attached)

Description (diagnostics are in brown)

Fruit a cypsela, narrowly oblong to cuneate, sometimes slightly curved, ± terete (cross-section roundish to 3+-angled), 1–2 mm long x 0.3–0.5 mm diameter. Surface cream-colored, longitudinally 5–10-ribbed, glandular (mostly between ribs). Pappus typically present and persistent (sometimes corolla persistent as well), composed of a minute crown of toothed scales to 0.5 mm long.

Style base lobed, yellowish, surrounded by a raised, whitish ring, apical scar (including crown) 0.4–0.5 mm across.

Fruit attachment scar basal, flush to slightly indented, irregularly and variably lobed, granular inside.

Risk Assessment (codes in yellow or red indicate cause for concern; assessments are current as of mid-2011; click AUQP, NZBORIC, or NZBPI for access to the most recent versions of these databases and possible assessment changes)