Matricaria discoidea DC.
Family: Asteraceae, Tribe: Anthemideae
Pertinent Synonyms & Notes (particularly those used in California; go to GRIN for other synonyms)
Chamomilla suaveolens (Pursh) Ryberg
Pertinent Common Names (particularly those used in California; go to GRIN for other common names)
pineappleweed, rayless chamomile
Primary Disseminule Type
Description (diagnostics are in brown)
Fruit a cypsela, oblong to oblanceolate, mildly compressed, asymmetrical (abaxially ± gibbous distally), cross-section ± elliptic to 4-sided due to 4 longitudinal ribs, 1–2 mm long x 0.4–0.6 mm wide x 0.3–0.5 mm thick. Surface glabrous, straw-colored to very pale brown or grayish, smooth, with 4 whitish longitudinal ridges (at least 2 of which are typically associated with narrow reddish-brown mucilaginous glands covering over half the length of the fruit). Pappus a short crown to 0.1 mm long x 0.3–0.5 mm across (can be mistakenly interpreted as though there is no pappus).
Style base inconspicuous, cylindrical, whitish.
Fruit attachment scar basal, cup-like, whitish.
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)
AUQP, AUWP, NZBORIC, NZBPI