UW Burke Herbarium species comparison

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Ivesia muirii

Ivesia tweedyi

Tweedy's mousetail
Habit Herbaceous perennial from a strong taproot, the flowering stems 5-20 cm. tall, nearly glabrous below and glandular-pubescent above.
Leaves

Basal leaves numerous, the blades 3-8 cm. long, pinnate, the leaflets 19-35, less than 1 cm. long, dissected into many filiform or linear segments;

cauline leaves 1-3, greatly reduced, the stipules well developed.
Flowers

Inflorescence a congested, terminal cluster;

calyx bowl-shaped, yellowish-green, the 5 lobes deltoid-ovate, yellowish, 2.5-3 mm. long;

petals 5, yellow, elliptic to spatulate, longer than the sepals;

stamens 5, pistils 4-6.
Fruits

Achenes 2 mm. long, smooth.

Ivesia muirii

Ivesia tweedyi
Flowering time June-August
Habitat Dry, open to wooded areas, middle to high elevations in the mountains.
Distribution
[WildflowerSearch map]
[BONAP county map]
Occurring east of the Cascades crest in Washington; Washington to Idaho and Montana.
[WildflowerSearch map]
[BONAP county map]
Origin Native
Conservation status Not of concern
Sibling taxa
I. gordonii, I. tweedyi
I. gordonii
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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