Townsendia hookeri (Hooker's Townsendia) - photos and description


Involucre about 10 mm wide.

Flower petal about 8 mm long.


General: Acaulescent plants with a tufted growth habit, growing from a taprooted caudex.

Flowers: Flower heads sessile among the leaves, showy, we measured a flower head at 25 mm diameter, petals to 9 mm long, disc flower at 5 mm long, and the involucre at 9 mm wide and 10 mm high.

Leaves: Leaves are all basal, tufted, linear to linear-oblanceolate, strigose, grey-green in colour, we measured a leaf at 12 mm long by 1 mm wide.

Height: Not applicable.

Habitat: Dry and eroded hills.

Abundance: Extremely rare, ranked as an S1 by the Saskatchewan Conservation Data Centre.

Origin: Native.

Similar species: Very similar to the more common Townsendia exscapa, however that plant is larger with flower petals (ray florets) from 12 to 22 mm long, and an involucre 20 to 25 mm wide; whereas Townsendia hookeri has flower petals 8 to 14 mm long, and an involucre about 15 mm wide (Flora of Alberta).

When and where photographed: The above photos were taken May 11th, rocky hilltop, Cypress Hills Provincial park, about 450 km southwest of our home in Regina, SK.