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absinth wormwood, absinthe, absinthe wormwood, absinthium, armoise absinthe, common wormwood, green ginger, oldman, oldman wormwood, wormwood

black sagebrush, dwarf sagebrush, little sagebrush, low sagebrush

Habit Perennials, 40–60(–100) cm (mat-forming), aromatic. Shrubs, 10–30(–50) cm, aromatic; root-sprouting.
Stems

gray-green (sometimes woody proximally), densely canescent to glabrescent (hairs appressed).

gray-green to brown, glabrate (diffusely branched from bases, brittle).

Leaves

deciduous, gray-green;

blades broadly ovate, 3–8 × 1–4 cm, mostly pinnately lobed (basal 2–3-pinnatifid, lobes obovate), faces densely canescent.

(vegetative stems) persistent, gray-green;

blades broadly to narrowly cuneate, 3–10 × 2–5 mm, lobed (lobes 3, oblong-linear, to 1/3 blade lengths, mostly 1–3 mm wide, flat, obtuse, laterals sometimes 2–3-fid; leaves on flowering stems deciduous, blades narrowly cuneate, deeply 3-lobed), faces densely hairy (not sticky resinous).

Involucres

broadly ovoid, 2–3 × 3–5 mm.

campanulate or globose-ovoid, (1.5–)2–4(–5) × 1.5–4.5 mm.

Florets

pistillate 9–20;

bisexual 30–50;

corollas 1–2 mm, glandular.

4–6(–10);

corollas 1.5–2 mm, glabrous.

Phyllaries

gray-green, densely sericeous.

(margins green) ovate (outer) to oblong, pubescent or tomentose.

Heads

(nodding) in open (diffusely branched), paniculiform arrays 10–20(–35) × (2–)10–13(–15) cm.

usually borne singly, rarely (1–4, erect, mostly sessile, in pedunculate clusters) in spiciform or paniculiform arrays 2–9 × 0.5–2 cm (branches slender).

Cypselae

(± cylindric, slightly curved, obscurely nerved), ± 0.5 mm, glabrous (shiny).

(light brown) 0.7–0.8 mm, resinous.

2n

= 18.

Artemisia absinthium

Artemisia arbuscula

Phenology Flowering mid summer–fall.
Habitat Widely cultivated, persisting from plantings, disturbed areas
Elevation 0–1000 m [0–3300 ft]
Distribution
from FNA
CA; CO; CT; IA; ID; IL; IN; KS; MA; MD; ME; MI; MN; MO; MT; NC; ND; NE; NH; NJ; NY; OH; OR; PA; RI; SC; SD; TN; UT; VT; WA; WI; WY; AB; BC; MB; NB; NF; NS; ON; PE; QC; SK; Europe [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; CO; ID; MT; NV; OR; UT; WA; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Artemisia absinthium provides the flavoring as well as the psychoactive ingredient for absinthe liquor, a beverage that is illegal in some markets. Known as a powerful neurotoxin, absinthe in large quantities is addictive as well as deadly. The species is popular in the horticultural trade. Prized by gardeners for its gracefully scalloped leaves and gray-green foliage, it creates an attractive and winter-hardy flower border.

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

Subspecies 3 (3 in the flora).

Artemisia arbuscula is one of the more perplexing species in the Tridentatae complex. Anatomic and morphologic characteristics suggest multiple hybrid origins for the subspecies. Deciduous leaves of flowering stems in plants that otherwise have persistent leaves suggest a hybrid origin involving plants of the A. tridentata and A. cana lineages. In most instances, populations of A. arbuscula appear to be reproductively stable. The disposition of Artemisia arbuscula subsp. longicaulis Winward & McArthur (with 2n = 54) has not been determined.

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

Key
1. Involucres 2–4.5 mm diam.; usually in rocky soils; flowering mid–late summer
subsp. arbuscula
1. Involucres 1.5–2.5 mm diam.; clays or stony soils; flowering early spring–late summer
→ 2
2. Leaves broadly cuneate (4–10 × 2–5 mm, often irregularly lobed, lobes rounded, middle lobes overlapping lateral lobes); usually in clay soils; flower- ing early spring
subsp. longiloba
2. Leaves narrowly cuneate (5–10 × 3–6 mm, lobed, lobes 1/2+ blade lengths, laterals to 1 mm wide, of-ten acute); usually in stony soils; flowering mid–late summer
subsp. thermopola
Source FNA vol. 19, p. 519. Treatment author: Leila M. Shultz. FNA vol. 19, p. 511. Treatment author: Leila M. Shultz.
Parent taxa Asteraceae > tribe Anthemideae > Artemisia > subg. Absinthium Asteraceae > tribe Anthemideae > Artemisia > subg. Tridentatae
Sibling taxa
A. abrotanum, 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. 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. 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. senjavinensis, A. serrata, A. spiciformis, A. stelleriana, A. suksdorfii, A. tilesii, A. tridentata, A. tripartita, A. vulgaris
Subordinate taxa
A. arbuscula subsp. arbuscula, A. arbuscula subsp. longiloba, A. arbuscula subsp. thermopola
Synonyms A. tridentata subsp. arbuscula, A. tridentata var. arbuscula, Seriphidium arbusculum
Name authority Linnaeus: Sp. Pl. 2: 848. (1753) Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 398. (1841)
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