Artemisia arbuscula subsp. longiloba

(Osterhout) L. M. Shultz

Sida 21: 1637. 2005.

Endemic
Basionym: 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

V19-864-distribution-map.gif

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.

Selected References

None.

Lower Taxa

None.
not tailed +  and obtuse +
scarious +
paniculiform +  and spiciform +
indeterminate +  and determinate +
2 cm20 mm <br />0.02 m <br /> (9 cm90 mm <br />0.09 m <br />) +
0.5cm +  and 2cm +
Leila M. Shultz +
(Osterhout) L. M. Shultz +
decurrent +
Artemisia spiciformis var. longiloba +
compound +  and simple +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
lobed;cuneate +
2mm;5mm +
zygomorphic +, actinomorphic +  and (3-)5-merous +
red +  and pale-yellow +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
winged +  and monomorphic +
fertile +  and bisexual +
fertile +  and bisexual +
Calif. +, Colo. +, Idaho +, Mont. +, Oreg. +, Utah +  and Wyo. +
1500–2500 m +
gland-dotted +
pistillate +, staminate +  and neuter +
fertile +  and bisexual +
winged +  and beaked +
dispersed +
Clay soils of alkaline basins and valleys, occasionally on outwash plains of mountains +
spiciform +  and racemiform +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
globose-ovoid;campanulate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
sessile +  and petiolate +
gray-green +
persistent +
cauline +  and basal +
cuneate +
deltate +
entire +  and dentate +
2-carpellate +
persistent +
Flowering early–late spring. +
tomentose +  and pubescent +
2 +  and 20 +
styliferous +, neuter +  and pistillate +
sterile +  and fertile +
conic;convex;conic;convex;flat +
2 +  and 5 +
exalbuminous +
gray-green +  and brown +
1 +  and 10 +
not wand-like +
appendaged +  and truncate +
papillate +
Artemisia longiloba +  and Seriphidium arbusculum subsp. longilobum +
Artemisia arbuscula subsp. longiloba +
Artemisia arbuscula +
subspecies +
funnel +  and subglobose +
cylindric +
perennial +, biennial +  and annual +
shrub +  and root-sprouting +