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:

Bromus marginatus, Elymus glaucus, Thermopsis rhombifolia

RARITY STATUS

Provincial Status According
to Harms (2003):

Threatened

Nature Conservancy Status:

G5T5 S2

Saskatchewan Species at
Risk Status:

None

COSEWIC Status:

None

Perideridia gairdneri ssp. borealis 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 tall

Roots:

taproot fascicled

Stems:

mostly solitary, unbranched, ridged, slender, glabrous

Leaves:

cauline and basal, few, slightly reduced upwards, 1 – 2 times pinnate, basal leaves simply pinnate, oblong to ovate

Leaflets:

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

Inflorescence:

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

Umbellets:

8 – 20; involucel 1 – 4 mm long, scarious, green or absent

Flowers:

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

Fruits:

schizocarp 2 – 4 mm long, nearly as long as broad, suborbicular, flattened laterally, dark brown, glabrous; style persistent

KEY FOR SIMILAR GENERA FOUND IN SASKATCHEWAN
Perideridia gairdneri ssp. borealis 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 times pinnate; leaflets entire, linear, < 1 mm wide	Perideridia
2 Leaves once pinnate; leaflets serrate, linear or ovate, > 2 mm wide	3

3 Leaflets linear; plants of wet habitats	Sium
3 Leaflets ovate; plants of meadows or thickets	Pastinaca