Species: Perideridia gairdneri ssp. borealis Chuang & Constance

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Perideridia gairdneri ssp. borealis Chuang & Constance

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TAXONOMY

Family:

Apiaceae

Genus:

Perideridia

Species Synonyms:

Perideridia montana (Blank.) Dorn
Carum montanum Blank.
Atenia montana (Blank.) Rydb.

Common Names:

common yampah

DISTRIBUTION

Canada:

British Columbia - southwestern Saskatchewan

Saskatchewan:

southwestern Saskatchewan; Cypress Hills

Ecoregion:

Cypress Upland

HABITAT

Saskatchewan:

moist woods on cobbly slopes and hillsides; prairie

Associated species:

golden bean, mountain brome, smooth wild rye

RARITY STATUS

Provincial Status According
to Harms (2003):

Threatened

Nature Conservancy Status:

G5T5 S2

Saskatchewan Species at
Risk Status:

None

COSEWIC Status:

None

Common yampah is threatened in Saskatchewan because it is extremely rare and regionally restricted in the province. It is usually locally numerous within an area. No immediate threats are known but may occur in the future.

SPECIES DESCRIPTION

Height:

25 – 100 cm

Roots:

taproot in clusters of 2 - 3

Stems:

mostly solitary, unbranched, ridged, slender, hairless

Leaves:

on the stem and basal, few, slightly reduced upwards, 2 – 4 times longer than wide, 1 – 2 times pinnate, basal leaves once divided, margins nearly parallel to oval shaped

Leaflets:

3-7, 2 – 25 cm long, 2 – 4 mm wide, linear

Inflorescence:

umbel compound, 1 – several, axillary or terminal; bracts of 1 - 2 linear, sheathing leaves, 3 – 8 cm long

Umbellets:

8 – 20; bractlets 1 – 4 mm long, thin, dry and membranous, green or absent

Flowers:

8 – 20 per umbellet; petals < 1 mm long, 5 – 7 veined, greenish, white, or pink; sepal teeth conspicuous

Fruits:

dry fruit 2 – 4 mm long, nearly as long as broad, almost round, flattened laterally, dark brown, hairless; persistent style

KEY FOR SIMILAR GENERA FOUND IN SASKATCHEWAN
Common yampah is the only member of Perideridia in Saskatchewan.

1 Fruit many times longer than broad, usually bristly hairy	Osmorhiza
1 Fruit 3 x as long as broad or less, not bristly hairy	2

2 Leaves 1 – 2 x divided; leaflets entire, linear, < 1 mm wide	Perideridia
2 Leaves 1 x divided; leaflets saw-toothed, linear or oval shaped > 2 mm wide	3

3 Leaflets linear; plants of wet habitats	Sium
3 Leaflets oval-shaped; plants of meadows or thickets	Pastinaca