Artemisia arbuscula subsp. longiloba

(Osterhout) L. M. Shultz

Sida 21: 1637. 2005

Basionyms: Artemisia spiciformis var. longiloba Osterhout Muhlenbergia 4: 69. 1908
Synonyms: Artemisia longiloba (Osterhout) Beetle Seriphidium arbusculum subsp. longilobum (Osterhout) W. A. Weber
Treatment appears in FNA Volume 19. Treatment on page 511. Mentioned on page 512.
Leaves broadly cuneate (4–10 × 2–5 mm, often irregularly lobed, lobes rounded, middle lobes overlapping lateral lobes). Involucres 2–3 × 1.5–2.5 mm. 2n = 18, 36.

Phenology: Flowering early–late spring.
Habitat: Clay soils of alkaline basins and valleys, occasionally on outwash plains of mountains
Elevation: 1500–2500 m

Distribution

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Calif., Colo., Idaho, Mont., Oreg., Utah, Wyo.

Discussion

Subspecies longiloba is distinguished from other members of the Artemisia arbuscula complex by its early blooming time. It is the only member of subg. Tridentatae to begin flowering as snow melts in early spring, and it is ecologically distinguished from other subspecies by its occurrence at low elevations, in fine-grained clay soils.

References

None.

Lower Taxa

No lower taxa listed.