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

Melilotus alba Desr.
white sweet-clover
Fabaceae (Pea Family)

Introduction to Vascular Plants

© Brian Klinkenberg  Email the photographer   (Photo ID #29869)


Distribution of Melilotus alba
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Species Information

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Illustration SourceThe Illustrated Flora of BC

General:
Annual or biennial herb from a taproot, sweet-scented in drying; stems erect, 0.5-2 m tall, freely branched, fine short-hairy to glabrous.
Leaves:
Alternate, pinnately compound; leaflets 3, oblong-elliptic to egg-shaped, 1-4 cm long, short-hairy to glabrous, the margins fine-toothed to the base; stipules entire or lobed, 5-10 mm long, joined at the base to the leaf stalk.
Flowers:
Inflorescence a slender, spike-like, axillary raceme of 20 to 50 or more pea-like flowers, the racemes 5-20 cm long on stalks from shorter to longer than the leaves; corollas white, 4-5 mm long, the banner longer than the wings; calyces bell-shaped, 2-3.5 mm long, the narrowly lanceolate teeth nearly equal to the tube.
Fruits:
Pods, egg-shaped, somewhat flattened but still plump, nodding, 3-6 mm long, somewhat leathery, glabrous, net-veined, 1-chambered; seeds 1 or 2.

SourceThe Illustrated Flora of British Columbia

USDA Flower Colour:
White
USDA Blooming Period:
Summer
USDA Fruit/Seed characteristics:
Colour: Yellow
Present over the Summer
According to the USDA, this species is a known allelopath.
Source:  The USDA

Ecology

Ecological Framework for Melilotus alba

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, 2008)

Site Information
Value / Class

Average

Minimum

Maximum

Elevation (metres)
772 335 1700
Slope Gradient (%)
20.5 0 110

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

220.7 35 338
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4.0 0 7
Modal Nutrient Regime
Class
Rich
Number of field plots
 species was recorded in:
79
Modal BEC Zone Class
BG

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

BG(32), BWBS(1), ICH(1), IDF(12), MS(2), PP(2)

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.

Habitat / Range

Mesic to dry fields, roadsides and waste places; common in S half of BC east of the Coast-Cascade Mountains, rare to the W and N; introduced from Eurasia.

SourceThe Illustrated Flora of BC

Taxonomic and Nomenclatural Links

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