Matricaria discoidea DC.
pineapple weed (disc mayweed)
Asteraceae (Aster family)
Introduction to Vascular Plants
pineapple weed (disc mayweed)
Asteraceae (Aster family)
Introduction to Vascular Plants
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.
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.
Illustration 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)
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) |
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) | ||
|
Source:
Klinkenberg 2013
|
|||
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.Status Information
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.