Flora of North America species comparison

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Artemisia nesiotica

Artemisia biennis

island sagebrush

armoise bisannuelle, biennial sagewort, biennial wormwood
Habit Subshrubs, 10–60 cm (rounded), aromatic. Annuals or biennials, (10–)30–80(–150) cm, not aromatic.
Stems

relatively numerous, ascending or prostrate, gray, simple or branched (slender, wandlike, soft, bases woody and brittle), densely canescent.

1, erect, often reddish, simple (finely striate), glabrous.
Leaves

cauline, gray-green;

blades linear-oblong, 3–5 × 1–2 cm, mostly 3-lobed (lobes 1–2 mm wide), faces gray-hairy.

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.
Involucres

broadly campanulate, 2.5 × 4–4.5 mm.

globose, 2–4 × (1.5–)2–4 mm.
Florets

pistillate 0;

bisexual 20–50;

corollas pale yellow, 1.2–1.5 mm, glandular.

pistillate 6–25;

bisexual 15–40;

corollas pale yellow, ca. 2 mm, glabrous.
Phyllaries

broadly ovate, densely hairy.

(green) broadly elliptic to obovate, glabrous.
Heads

(usually erect, sometimes nodding) in (leafy) paniculiform arrays 10–25 × 3–5(–7) cm.

(erect, subsessile) in (leafy) paniculiform to spiciform arrays 12–35(–40) × 2–4 cm (lateral branches relatively short).
Cypselae

(light brown) ellipsoid (ribbed), 0.5 mm, resinous.

ellipsoid (4–5-nerved), 0.2–0.9 mm, glabrous.
2n

= 18.

Artemisia nesiotica

Artemisia biennis
Phenology Flowering mid–late summer. Flowering mid summer–late fall.
Habitat Rocky slopes, often fog-shrouded hillsides Disturbed habitats, margins of vernal pools, desert flats, usually clay or silty soils
Elevation 0–100 m (0–300 ft) 600–2000 m (2000–6600 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; AZ; CA; CO; CT; DE; IA; ID; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; MT; ND; NE; NH; NJ; NM; NV; NY; OH; OR; PA; RI; SD; UT; VT; WA; WI; WV; WY; AB; BC; MB; NB; NS; NT; ON; PE; QC; SK; YT [Introduced in Europe, Pacific Islands (New Zealand)]
[WildflowerSearch map]
[BONAP county map]
Discussion

Artemisia nesiotica is known only from the Channel Islands of California. It differs from the closely related A. californica by its shorter stature, wider leaf lobes, and larger heads.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 530. FNA vol. 19, p. 523.
Parent taxa Asteraceae > tribe Anthemideae > Artemisia > subg. Artemisia Asteraceae > tribe Anthemideae > Artemisia > subg. Artemisia
Sibling taxa
A. abrotanum, A. absinthium, A. alaskana, A. aleutica, A. annua, A. arbuscula, A. biennis, A. bigelovii, A. borealis, A. californica, A. campestris, A. cana, A. carruthii, A. douglasiana, A. dracunculus, A. filifolia, A. franserioides, A. frigida, A. furcata, A. globularia, A. glomerata, A. laciniata, A. longifolia, A. ludoviciana, A. michauxiana, A. norvegica, A. nova, A. packardiae, A. palmeri, A. papposa, A. pattersonii, A. pedatifida, A. pontica, A. porteri, A. pycnocephala, A. pygmaea, A. rigida, A. rothrockii, A. rupestris, A. scopulorum, A. senjavinensis, A. serrata, A. spiciformis, A. stelleriana, A. suksdorfii, A. tilesii, A. tridentata, A. tripartita, A. vulgaris
A. abrotanum, A. absinthium, A. alaskana, A. aleutica, A. annua, A. arbuscula, A. bigelovii, A. borealis, A. californica, A. campestris, A. cana, A. carruthii, A. douglasiana, A. dracunculus, A. filifolia, A. franserioides, A. frigida, A. furcata, A. globularia, A. glomerata, A. laciniata, A. longifolia, A. ludoviciana, A. michauxiana, A. nesiotica, A. norvegica, A. nova, A. packardiae, A. palmeri, A. papposa, A. pattersonii, A. pedatifida, A. pontica, A. porteri, A. pycnocephala, A. pygmaea, A. rigida, A. rothrockii, A. rupestris, A. scopulorum, A. senjavinensis, A. serrata, A. spiciformis, A. stelleriana, A. suksdorfii, A. tilesii, A. tridentata, A. tripartita, A. vulgaris
Synonyms Crossostephium insulare, A. californica var. insularis A. biennis var. diffusa
Name authority P. H. Raven: Aliso 5: 341. (1963) Willdenow: Phytographia, 11. (1794)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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