Artemisia biennis

Willdenow

Phytographia, 11. 1794.

Common names: Biennial wormwood armoise bisannuelle
Endemic
Synonyms: Artemisia biennis var. diffusa Dorn
Treatment appears in FNA Volume 19. Treatment on page 523. Mentioned on page 521.

Annuals or biennials, (10–) 30–80 (–150) cm, not aromatic. Stems 1, erect, often reddish, simple (finely striate), glabrous. Leaves cauline, green or yellow-green (sessile); blades broadly lanceolate to ovate, 4–10 (–13) × 1.5–4 cm, 1–2-pinnately lobed (ultimate lobes coarsely toothed), faces glabrous. Heads (erect, subsessile) in (leafy) paniculiform to spiciform arrays 12–35 (–40) × 2–4 cm (lateral branches relatively short). Involucres globose, 2–4 × (1.5–) 2–4 mm. Phyllaries (green) broadly elliptic to obovate, glabrous. Florets: pistillate 6–25; bisexual 15–40; corollas pale-yellow, ca. 2 mm, glabrous. Cypselae ellipsoid (4–5-nerved), 0.2–0.9 mm, glabrous. 2n = 18.


Phenology: Flowering mid summer–late fall.
Habitat: Disturbed habitats, margins of vernal pools, desert flats, usually clay or silty soils
Elevation: 600–2000 m

Distribution

V19-894-distribution-map.gif

Alta., B.C., Man., N.B., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon, Alaska, Ariz., Calif., Colo., Conn., Del., Idaho, Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.Dak., Ohio, Oreg., Pa., R.I., S.Dak., Utah, Vt., Wash., W.Va., Wis., Wyo., in Europe, Pacific Islands (New Zealand)

Discussion

Artemisia biennis is naturalized and weedy in the eastern portion of its range. It is morphologically similar to A. annua, differing primarily in the coarser leaf lobes and larger heads that are sessile in axils of leaflike bracts. Artemisia biennis is considered native to the northwest United States; it may be introduced in other parts of its range. The type specimen is a horticultural specimen from New Zealand.

Selected References

None.

Lower Taxa

None.
... more about "Artemisia biennis"
not tailed +  and obtuse +
scarious +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Leila M. Shultz +
Willdenow +
decurrent +
compound +  and simple +
10 cm100 mm <br />0.1 m <br /> (13 cm130 mm <br />0.13 m <br />) +
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
lobed;broadly lanceolate;ovate +
1.5cm;4cm +
fertile +  and bisexual +
Biennial wormwood +  and armoise bisannuelle +
zygomorphic +, actinomorphic +  and (3-)5-merous +
2 cm20 mm <br />0.02 m <br /> (?) +
winged +  and monomorphic +
ellipsoid +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Man. +, N.B. +, N.W.T. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Ariz. +, Calif. +, Colo. +, Conn. +, Del. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.Dak. +, Ohio +, Oreg. +, Pa. +, R.I. +, S.Dak. +, Utah +, Vt. +, Wash. +, W.Va. +, Wis. +, Wyo. +, in Europe +  and Pacific Islands (New Zealand) +
600–2000 m +
gland-dotted +
peripheral +
winged +  and beaked +
dispersed +
Disturbed habitats, margins of vernal pools, desert flats, usually clay or silty soils +
paniculiform +  and spiciform +
in subcapitate clusters +  and singly +
35 cm350 mm <br />0.35 m <br /> (40 cm400 mm <br />0.4 m <br />) +
indeterminate +
12 cm120 mm <br />0.12 m <br /> (35 cm350 mm <br />0.35 m <br />) +
heterogamous +  and homogamous +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
each +  and sessile +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 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 /> (0.4 cm4 mm <br />0.004 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
sessile +  and petiolate +
yellow-green +  and green +
persistent +  and deciduous +
deltate +
entire +  and dentate +
2-carpellate +
persistent +
Flowering mid summer–late fall. +
2 +  and 20 +
Phytographia, +
styliferous +, neuter +  and pistillate +
sterile +  and fertile +
conic;convex;conic;convex;flat +
2 +  and 5 +
exalbuminous +
wand-like +
appendaged +  and truncate +
papillate +
Artemisia biennis var. diffusa +
Artemisia biennis +
Artemisia subg. Artemisia +
species +
funnel +  and subglobose +
cylindric +
fibrous-rooted +  and taprooted +
80 cm800 mm <br />0.8 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
biennial +  and annual +
30 cm300 mm <br />0.3 m <br /> (80 cm800 mm <br />0.8 m <br />) +
shrub +  and subshrub +