Flora of North America species comparison

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Artemisia laciniata

Artemisia rothrockii

Siberian wormwood

Rothrock sagebrush, sticky sagebrush, timberline sagebrush
Habit Perennials, 5–15 cm (not cespitose), sometimes mildly aromatic. Shrubs, 20–50 cm (sticky-resinous and dark green throughout), pungently aromatic; not root-sprouting (trunks relatively narrow).
Stems

1–3, erect, reddish brown, simple, strigillose to spreading-hairy, or glabrous.

white (becoming dark gray with age), canescent (bark exfoliating).
Leaves

basal (in rosettes, petioles to 12 cm) and cauline, greenish;

blades (basal) 2–3-pinnate, relatively deeply lobed (cauline sessile, 1–2-pinnately lobed to entire), faces sparsely hairy to pilose.

persistent, light or dark gray-green;

blades long-cuneate to lanceolate, (0.4–)1–1.5(–2) × 0.2–0.4 cm, 3-lobed (lobes to 1/3 blade lengths, rounded, margins sometimes entire, somewhat wavy), faces densely to sparsely canescent, gland-dotted, sticky-resinous.
Involucres

globose, 3–5 × 4–8 mm.

broadly ovoid, 3–5 × 4–6 mm.
Florets

pistillate 6–8;

bisexual 20–50;

corollas yellowish or yellow to reddish-tinged, 1–2 mm, hairy (hairs tangled).

12–20;

corollas 2.5–3.5 mm.
Phyllaries

(greenish or yellowish) elliptic (margins hyaline, brownish), glabrous or sparsely hairy.

(usually gray-green) ovate, densely or sparsely canescent.
Heads

(10–70, spreading to nodding, peduncles 0 or to 10 mm) in spiciform arrays 2–5 × 0.5–1 or 8–18 × 1–4 cm.

(erect, sessile or pedunculate) in paniculiform arrays, 5–15 × 1–2(–3) cm.
Cypselae

oblong, 0.5–1 mm, glabrous.

0.8–2 mm, (smooth), resinous.
2n

= 36, 54, 72.

Artemisia laciniata

Artemisia rothrockii
Phenology Flowering mid summer–all.
Habitat Clay soils of mountain meadows
Elevation 2500–3100 m (8200–10200 ft)
Distribution
from FNA
AK; CO; ID; NM; UT; YT; Eurasia
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 2 (2 in the flora).

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

Artemisia rothrockii is known only from the central and southern Sierra Nevada and the White Mountains of California. In the Rocky Mountains, A. spiciformis has been confused with A. rothrockii. Distinctive chemistry and anatomical structure of the leaves support the distinctness of A. rothrockii (L. M. Shultz 1986b). Intermediate characteristics suggest a hybrid origin from races of A. cana and A. tridentata.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Stems hairy; leaves mostly cauline, blades 5–20 × 1–2 cm, sparsely hairy; arrays of heads 8–18 × 1–4 cm; corollas yellowish, 1–1.5 mm
subsp. laciniata
1. Stems glabrous; leaves mostly basal, blades of proximalmost 4–8 × 0.5–1 cm, of cauline 1.5–0.8 × 0.2 cm, sericeous; arrays of heads 2–5 × 0.5–1 cm; corollas yellow or reddish-tinged, 1.5–2 mm
subsp. parryi
Source FNA vol. 19, p. 526. FNA vol. 19, p. 515.
Parent taxa Asteraceae > tribe Anthemideae > Artemisia > subg. Artemisia Asteraceae > tribe Anthemideae > Artemisia > subg. Tridentatae
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. 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. 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. rupestris, A. scopulorum, A. senjavinensis, A. serrata, A. spiciformis, A. stelleriana, A. suksdorfii, A. tilesii, A. tridentata, A. tripartita, A. vulgaris
Subordinate taxa
A. laciniata subsp. laciniata, A. laciniata subsp. parryi
Synonyms A. tridentata subsp. rothrockii, Seriphidium rothrockii
Name authority Willdenow: Sp. Pl. 3: 1843. (1803) A. Gray: in W. H. Brewer et al., Bot. California 1: 618. (1876)
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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