Alyssum alyssoides (L.) L.
pale alyssum (pale madwort)
Brassicaceae (Mustard family)

Introduction to Vascular Plants


© Virginia Skilton     (Photo ID #12105)


E-Flora BC Static Map

Distribution of Alyssum alyssoides
Click here to view the full interactive map and legend

Species Information

Annual or biennial herb from a slender taproot; stems erect or ascending with several ascending branches near the base, 10-25 (40) cm tall, the shoots grey-hairy with starlike hairs.
Basal leaves lacking; stem leaves narrowly oblanceolate, entire, 5-25 mm long, grey with starlike down.
Inflorescene elongate; flower stalks spreading, 2-5 mm long; flowers about 3 mm in diameter; petals cream or white, linear, 3-4 mm long; sepals about 2 mm long, soft-hairy and with starlike hairs, persistent in fruit.
Silicles, 3-4 mm long, almost circular (oval), starlike hairy, strongly flattened near the edges but bulging in the middle, 2 seeds in each chamber; styles up to 0.5 mm long.

SourceThe Illustrated Flora of British Columbia


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.


Ecological Framework for Alyssum alyssoides

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




Elevation (metres)
875 579 1480
Slope Gradient (%)
38 4 90

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

205 89 330
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 0 5
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

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

BG(2), ICH(2), IDF(16), MS(1), PP(17)

Habitat and Range

Dry roadsides and waste places in the steppe and montane zones; frequent in SC and SE BC, rare on S. Vancouver Island; introduced from Eurasia.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Alyssum calycinum L.
Clypeola alyssoides L.