Psilocarphus brevissimus var. brevissimus (Dwarf Woolly-Heads) - photos and description






Stem leaves are linear-oblong

Gnaphalium palustre in centre; all other grey-coloured plants are Psilocarphus brevissimus var. brevissimus

General: Low woolly annual plants. Plants single-stemmed to branching, erect to decumbent. Stunted plants were only 1 cm tall. Leaves, upper stems, and flower heads all woolly.

Flowers: Flower heads grow in compact clusters at stem tips and from leaf axils. Flowers lack involucral bracts and ray florets. We measured a flower cluster at 5 mm long by 6 mm wide.

Leaves: Stem leaves are opposite, entire, linear-oblong, we measured a leaf 6 mm long by 2 mm wide. A whorl of leaves subtends the flower heads.

Height: Height listed in Budd's Flora to 15 cm tall, we measured plants from 1 cm to 7 cm tall.

Habitat: Depressions in prairie which hold spring pools of water, southwest Saskatchewan.

Abundance: This plant is very rare, ranked as an S1 (as of 2021) by the Saskatchewan Conservation Data Centre.

Origin: Native.

Similar species: This plant might be mistaken for Gnaphalium palustre which shares the same habitat and is also a low-growing annual with woolly foliage. G. palustre however has alternate stem leaves, where those of Psilocarphus brevissimus var brevissimus has opposite stem leaves.

When and where photographed: The above photos were taken July 4th depression in prairie about ~ 40 metres in diameter, full of small hummocks, about 450 km southwest of Regina, SK.