Species: Viola labradorica Schrank

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Viola labradorica Schrank

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TAXONOMY

Family:

Violaceae

Genus:

Viola

Species Synonyms:

Viola adunca var. minor (Hook.) Fern.

Common Names:

alpine violet
northern blue violet

DISTRIBUTION

Canada:

Northwest Territories – northern Manitoba – northern Ontario – northern Quebec – northern Labrador, Newfoundland

Saskatchewan:

northeastern Saskatchewan

Ecoregion:

Selwyn Lake Upland

HABITAT

Saskatchewan:

dry to moist meadows, woods, and open ground

RARITY STATUS

Provincial Status According
to Harms (2003):

Endangered

Nature Conservancy Status:

Saskatchewan Species at
Risk Status:

None

COSEWIC Status:

None

Viola labradorica is endangered because it is extremely rare in Saskatchewan. No collections have been made of this species in the province. Possible threats have been identified.

SPECIES DESCRIPTION

Rhizomes:

rhizomes slender, elongate

Stems:

leafy, erect

Leaves:

alternate, petiolate, cordate-ovate to reniform, base cordate to subcordate, glabrous, margin toothed; stipules narrow, bract-like, margin subentire

Inflorescence:

flowers solitary, axillary

Flowers:

perfect, zygomorphic; calyx 5-merous, eciliolate; corolla 5-merous, spur less than 1 cm long, lateral petals bearded, deep-violet or blue-violet; stamens 5; style recurved and somewhat pubescent

Fruits:

capsule 3-valved; seeds numerous

VIOLA KEY FOR SPECIES FOUND IN SASKATCHEWAN

1 Plants acaulescent; leaves and peduncles arising from a caudex and/or plants with stolons	2
1 Plants caulescent; flowers axillary, stolons and caudex absent	11

2 Leaves deeply divided; plants of prairies and dry areas	V. pedatifida
2 Leaves toothed or lobed but not deeply divided or margin entire; plants of meadows to moist woods or boggy areas	3

3 Flowers white, may have purplish lines towards the base	4
3 Flowers blue to violet	7

4 Plants without stolons; leaves orbicular to reniform	V. renifolia
4 Plants stoloniferous; leaves ovate to reniform	5

5 Leaves pubescent, at least when young; petioles and peduncles reddish	V. blanda var. palustriformis
5 Leaves glabrous; petioles and peduncles greenish	6

6 Leaves 2 – 5 cm long, 2.5 – 3.5 cm wide	V. palustris var. brevipes
6 Leaves 1 – 2 cm long, 1 – 1.5 cm wide	V. macloskeyi ssp. pallens

7 Rhizomes thick and fleshy; stolons absent; caudex usually short and thick; lateral petals bearded or not; sepals ciliolate or eciliolate	8
7 Rhizome slender and cord-like; stolons present or absent; caudex present or absent; lateral petals always bearded (except V. selkirkii); sepals eciliolate	10

8 Spurred petal beardless	V. sororia
8 Spurred petal bearded	9

9 Sepals ciliolate	V. septentrionalis
9 Sepals eciliolate	V. nephrophylla

10 Stolons present; petal spur much shorter than the blade; lateral petals bearded; plants of moist meadows and streams	V. palustris var. palustris
10 Stolons present; petal spur to 2/3 as long as blade; lateral petals beardless; plants of woods and rocky slopes	V. selkirkii

11 Leaves lanceolate to narrowly ovate; flowers yellow, may have purple veins at the base	12
11 Leaves cordate-ovate to reniform; flowers yellow, white or blue	13

12 Leaves usually at least three times as long as wide, lanceolate to elliptic	V. nuttallii
12 Leaves less than three times as long as wide, narrowly ovate	V. vallicola var. vallicola

13 Flowers yellow, with purplish-brown veins; plants of rich deciduous woods	V. pubescens var. scabriuscula
13 Flowers white to lilac or blue; plants of woods or meadows	14

14 Flowers white inside, yellow at base and with purplish veins or purple tinge on outside; stipules entire	V. canadensis var. rugulosa
14 Flowers blue to lilac; stipules toothed	15

15 Leaves thin, glabrous; stipules ovate; flowers lilac	V. conspersa
15 Leaves thick, glabrous to densely pubescent; flowers deep blue	16

16 Leaves densely pubescent	V. adunca var. adunca
16 Leaves glabrous	V. labradorica