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Packard's artemisia, Packard's wormwood, Succor Creek mugwort

arctic wormwood

Habit Perennials, 20–50(–60) cm, strongly aromatic (rhizomatous, fibrous-rooted). Perennials, 30–90 cm (densely cespitose), mildly aromatic (caudices branched, woody, taprooted).
Stems

3–20, erect, light brown, simple or branched, glabrous.

1–9, erect, gray-green, lanate.

Leaves

cauline, dark green;

blades lanceolate, 1.5–5 × 1–2.5 cm, 2-pinnatifid (primary lobes 5–9, 0.4–1.5 cm; cauline smaller, pinnatifid to entire), faces tomentose (abaxial) or glabrous (adaxial).

mostly basal (in rosettes, cauline 2–5, scattered on flowering stems);

blades (basal) broadly oblanceolate, 0.5–0.8 × 0.5–0.7 cm, relatively deeply lobed (lobes 3–5, acute; cauline blades 0.5–1 cm, entire or pinnately lobed, lobes 3–5), faces densely tomentose to sericeous (hairs 1–2 mm).

Involucres

campanulate to hemispheric, 2.5–3.5 × 2–4.5 mm.

turbinate, 3–4 × 3–5 mm.

Florets

pistillate 3–8;

bisexual, sometimes functionally staminate, (15–)20–35;

corollas bright yellow, 1.3–2.2 mm, glandular.

pistillate 4–5;

bisexual 3–4;

corollas yellow or tan, 1.5–2, glandular (style branches blunt, not fringed).

Phyllaries

broadly ovate, glandular (at least at bases).

lanceolate or ovate, hairy.

Heads

(peduncles 0 or to 3 mm) in usually paniculiform, sometimes racemiform, arrays 5–20 × 1.5–4 cm.

in corymbiform arrays 0.5–2.5 × 0.5–2.5 cm (subtended by white-sericeous bracts).

Cypselae

(light brown) ellipsoid (± arcuate, ribs 4, prominent), ca. 1 mm, glandular.

(brown) linear-oblong, ca. 2 mm, (apices flat), glabrous.

2n

= 18.

= 36, 54.

Artemisia packardiae

Artemisia senjavinensis

Phenology Flowering late summer. Flowering mid–late summer.
Habitat Coarse taluses, alkaline soils, erosion gullies Open calcareous gravelly slopes in tundra or heath, sandy slopes above high tide
Elevation 1000–2400 m (3300–7900 ft) 0–600 m (0–2000 ft)
Distribution
from FNA
ID; NV; OR
[BONAP county map]
from FNA
AK; e Asia (Russian Far East, Chukotka)
[BONAP county map]
Discussion

Artemisia packardiae is known only from southeastern Oregon, western Idaho, and northeastern Nevada. It is closely related to A. michauxiana and could be considered an ecologic variant.

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

Artemisia senjavinensis is known only from western Alaska (Seward Peninsula) and the Chukchi Peninsula of the Russian Far East.

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

Source FNA vol. 19, p. 531. FNA vol. 19, p. 532.
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. nesiotica, A. norvegica, A. nova, 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. 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. 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. serrata, A. spiciformis, A. stelleriana, A. suksdorfii, A. tilesii, A. tridentata, A. tripartita, A. vulgaris
Synonyms Ajania senjavinensis, A. androsacea
Name authority J. W. Grimes & Ertter: Brittonia 31: 454, fig. 1. (1979) Besser: Nouv. Mém. Soc. Imp. Naturalistes Moscou 3: 35. (1834)
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