Artemisia michauxiana

Besser in W. J. Hooker

in W. J. Hooker, Fl. Bor.-Amer. 1: 324. 1833.

Common names: Lemon sagewort
Endemic
Synonyms: Artemisia discolor Douglas ex Besser Artemisia vulgaris subsp. michauxiana (Besser) H. St. John
Treatment appears in FNA Volume 19. Treatment on page 530. Mentioned on page 522, 531.

Perennials, 30–100 cm, strongly aromatic (lemon-scented; rhizomatous). Stems relatively many, erect, green, simple, glabrous. Leaves cauline, green; blades broadly lanceolate to narrowly elliptic, 1.5–11 × 1–1.5 cm, 2-pinnately lobed, (ultimate lobes toothed), faces white-tomentose (abaxial) or glabrous (adaxial), yellow-gland-dotted. Heads (erect to nodding, peduncles 0 or to 10 mm) in paniculiform to spiciform arrays 8–15 × 1–1.5 cm. Involucres campanulate, 3 (–4) × 2–5.5 mm. Phyllaries (yellow-green, rarely purplish) broadly ovate, glabrous or sparsely hairy, yellow-gland-dotted. Florets: pistillate 9–12; bisexual 15–35; corollas yellow, 1–1.5 mm, glandular. Cypselae (yellow to light-brown) ellipsoid, ca. 0.5 mm, glabrous or glandular. 2n = 18, 36.


Phenology: Flowering mid summer–early fall.
Habitat: Talus slopes, alpine and subalpine drainages
Elevation: 1900–3700 m

Distribution

V19-915-distribution-map.gif

Alta., B.C., Yukon, Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.

Discussion

Members of the Artemisia ludoviciana complex with deeply lobed leaves are sometimes confused with A. michauxiana, and there is evidence that plants hybridize in some locations. Artemisia michauxiana is distinguished by its glabrous, bright green to yellow-green foliage and lemony-sweet fragrance.

Selected References

None.

Lower Taxa

None.
... more about "Artemisia michauxiana"
not tailed +  and obtuse +
scarious +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Leila M. Shultz +
Besser in W. J. Hooker +
decurrent +
compound +  and simple +
1.5 cm15 mm <br />0.015 m <br /> (11 cm110 mm <br />0.11 m <br />) +
lobed;broadly lanceolate;narrowly elliptic +
1cm;1.5cm +
fertile +  and bisexual +
Lemon sagewort +
zygomorphic +, actinomorphic +  and (3-)5-merous +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
winged +  and monomorphic +
glandular +  and glabrous +
ellipsoid +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Yukon +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +, Wash. +  and Wyo. +
1900–3700 m +
yellow-gland-dotted +
glabrous +  and white-tomentose +
peripheral +
winged +  and beaked +
dispersed +
Talus slopes, alpine and subalpine drainages +
paniculiform +  and spiciform +
in subcapitate clusters +  and singly +
indeterminate +
8 cm80 mm <br />0.08 m <br /> (15 cm150 mm <br />0.15 m <br />) +
heterogamous +  and homogamous +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
3 cm30 mm <br />0.03 m <br /> (?) +
campanulate +
0.2 cm2 mm <br />0.002 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
sessile +  and petiolate +
persistent +  and deciduous +
deltate +
entire +  and dentate +
2-carpellate +
persistent +
Flowering mid summer–early fall. +
hairy +  and glabrous +
2 +  and 20 +
in W. J. Hooker, Fl. Bor.-Amer. +
styliferous +, neuter +  and pistillate +
sterile +  and fertile +
conic;convex;conic;convex;flat +
2 +  and 5 +
exalbuminous +
wand-like +
appendaged +  and truncate +
papillate +
Artemisia discolor +  and Artemisia vulgaris subsp. michauxiana +
Artemisia michauxiana +
Artemisia subg. Artemisia +
species +
funnel +  and subglobose +
cylindric +
fibrous-rooted +  and taprooted +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
shrub +  and subshrub +