Pulsatilla occidentalis
Pulsatilla occidentalis | |
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Anemone occidentalis achene | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Order: | Ranunculales |
Family: | Ranunculaceae |
Genus: | Anemone |
Species: | A. occidentalis
|
Binomial name | |
Anemone occidentalis | |
Synonyms | |
Pulsatilla occidentalis (S. Watson) Freyn |
Anemone occidentalis, the white pasqueflower[1] or western pasqueflower, is a herbaceous plant species in the genus Anemone and family Ranunculaceae. Other authorities place it in the genus Pulsatilla.[citation needed] Individuals are 10–60 cm (3.9–23.6 in) tall, from caudices, with three to six leaves at the base of the plant that are 3-foliolate, each leaflet pinnatifid to dissected in shape. Leaf petioles are 6–10 cm (2.4–3.9 in) long. Leaves have villous hairs and their margins are pinnatifid or dissected. Plants flower briefly mid-spring to mid-summer, usually soon after the ground is exposed by melting snow. The flowers are composed of five to seven sepals (sometimes called tepals), normally white or soft purple, also mixed white and blueish purple, one flower per stem. The sepals are 15–30 mm (0.59–1.18 in) long and 10–17 mm (0.39–0.67 in) wide. Flowers have 150–200 stamens. The fruit occurs in heads rounded to subcylindric in shape, with pedicels 15–20 cm (5.9–7.9 in) long. The achenes are ellipsoid in shape, not winged, covered with villous hairs, with beaks curved that reflex as they age and 20–40 mm (0.79–1.57 in) long, feather-like. Generally, the fruit persists into fall.
Native to far western North America including British Columbia to California and Montana, it is found growing in gravelly soils on slopes and in moist meadows.[2]
Landmarks
Pulsatilla Pass in Banff National Park is named after this species.[3]
References
- ^ USDA, NRCS (n.d.). "Pulsatilla occidentalis". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 16 October 2015.
- ^ Flora of North America Vol 3, Magnoliophyta:Magnoliidae and Hamamelidae. Flora of North America Editorial Committee. Oxford University Press. 1997. pp. 139–158. ISBN 0-19-511246-6.
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: CS1 maint: others (link) - ^ http://www.peakfinder.com/passes.asp?passname=Pulsatilla+Pass
External links