E-Flora BC: Electronic Atlas of the Flora of British Columbia

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

Introduction to Vascular Plants

© Mike Edley  Email the photographer   (Photo ID #3588)

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Distribution of Matricaria discoidea
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Species Information

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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.

Source: The Illustrated Flora of British Columbia

Habitat / Range

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

Source: The Illustrated Flora of British Columbia

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

Minimum

Average

Maximum

Elevation (metres) 840 899 1053
Slope Gradient (%) 0 7 27
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
43 201 308
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 3 4
Modal Nutrient Regime
Class
C
Number 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)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References