Centromadia pungens

   (Hooker & Arnott) Greene
Family: Asteraceae, Tribe: Heliantheae

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

Hemizonia pungens (Hooker & Arnott) Torrey & A. Gray

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

common tarweed

Primary Disseminule Type


Description (diagnostics are in brown)

Fruit a cypsela, obcuneate to obovate or oblanceolate, mildly laterally compressed, dorsally gibbous and curved towards ventral side which has a ± distinct longitudinal rib running from the base to the beak, cross-section trigonous, (1.5)2–2.5 mm long x 0.8–1.1 mm wide x 0.9–1.3 mm thick. Surface glabrous, irregularly wrinkled, gray or tan to brown or black with various irregular markings. Apex beaked, beak offset ventrally, ascending. Pappus none.

Style base missing or inconspicuous, cylindrical, whitish. Apical scar 0.1–0.2 mm across.

Fruit attachment scar basal, whitish, a protrusion measuring 0.1–0.2 mm across.

Similar Species

Deinandra kelloggii
Deinandra pallida

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)