Matricaria discoidea DC.
pineapple weed (disc mayweed)
Asteraceae (Aster family)

Introduction to Vascular Plants

Photograph

© Brian Klinkenberg     (Photo ID #20931)


Map

E-Flora BC Static Map

Distribution of Matricaria discoidea
Click here to view the full interactive map and legend

Species Information

General:
Pineapple-scented annual herb from a fibrous root; stems erect, simple, branched, glabrous, 5-45 cm tall.
Leaves:
Basal leaves soon deciduous; stem leaves alternate, 1-5 cm long, 10-18 mm wide, 1-3 times divided into short, very narrow segments.
Flowers:
Heads discoid, several to many at the ends of branches; involucres 2.5-3 mm tall; involucral bracts broadly oblong to egg-shaped, with broad, pale margins and a central brownish to greenish area; discoid; disk flowers yellowish-green, 4-toothed, 1.2-1.5 mm long; receptacles narrowly dome-shaped to conic, hollow, 4-6 mm tall.
Fruits:
Achenes with 2 marginal nerves and 1 nerve on the inner face, glabrous; pappus a short, membranous crown.

SourceThe Illustrated Flora of British Columbia

Illustration

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Ecology

Ecological Framework for Matricaria discoidea

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Avg

Min

Max

Elevation (metres)
899 840 1053
Slope Gradient (%)
7 0 27

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

201 43 308
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 2 4
Modal Nutrient Regime
Class
C
# of field plots
 species was recorded in:
8
Modal BEC Zone Class
IDF

All BEC Zones (# of stations/zone) species was recorded in

IDF(8)

Habitat and Range

Dry roadsides and disturbed areas in the lowland, steppe and montane zones; common throughout BC; probably introduced from elsewhere in North America.

SourceThe Illustrated Flora of British Columbia

Synonyms

Synonyms and Alternate Names:
Artemisia matricarioides auct. non Less.
Chamomilla suaveolens (Pursh) Rydb.
Lepidanthus suaveolens (Pursh) Nutt.
Lepidotheca suaveolens (Pursh) Nutt.
Matricaria matricarioides auct. non (Less.) Porter
Matricaria suaveolens (Pursh) Buchenau, non L.
Santolina suaveolens Pursh
Tanacetum suaveolens (Pursh) Hook.