Flora of North America species comparison

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Artemisia pattersonii

Artemisia papposa

Patterson sagewort, Patterson's wormwood

Owyhee sage, Owyhee sagebrush
Habit Perennials, 8–20 cm, mildly aromatic. Shrubs, 5–15(–20) cm (not cespitose), aromatic.
Stems

gray-brown, glabrate or finely pubescent.

relatively numerous, erect, gray, simple (annual flowering branches leafy), loosely sericeous.
Leaves

deciduous, gray-green;

petiolate;

blades (basal) broadly spatulate, 2–4 × 0.5 cm, pinnately lobed (lobes ca. 1.5 mm wide; cauline smaller, 1-pinnately lobed or entire), faces silky-hairy.

(semideciduous) cauline (sessile), gray-green;

blades oblanceolate, 0.5–3 × 0.2–1.5 cm (bases attenuate), 3-lobed or irregularly palmatifid (lobes narrow, apices acute), sparsely sericeous-lanate.
Involucres

broadly hemispheric, 5–8 × 5–8(–10) mm.

globose, 3.5–5 × 4–5 mm.
Florets

pistillate 7–27;

bisexual 32–100;

corollas (yellow tinged with red), 2–3 mm (including exsert anthers), mostly glabrous (embedded in tangled receptacular hairs).

pistillate 8;

bisexual 20–35;

corollas yellow (tubular with broad throats), ca. 2 mm, glandular.
Phyllaries

gray (margins dark brown to black), villous.

ovate, sparsely sericeous.
Heads

borne singly or (2–5, spreading to nodding, pedunculate) in paniculiform or racemiform arrays 1–5 × 0.5–1 cm.

(mostly erect, peduncles 0 or to 25 mm) in racemiform arrays (4–)8–12(–14) × (0.5–)1–2(–4) cm.
Cypselae

1.5–2 mm, glabrous.

(light brown) oblanceoloid (4–5-angled, broadest at truncate apices), 0.3–0.5 mm, glandular-pubescent (pappi coroniform, 0.3–0.6 mm, irregularly lacerate).
2n

= 14.

Artemisia pattersonii

Artemisia papposa
Phenology Flowering mid–late summer. Flowering early spring–mid summer.
Habitat Alpine meadows Rocky swales, dry meadows, alkaline mud flats
Elevation 3500–4000 m (11500–13100 ft) 1400–2100 m (4600–6900 ft)
Distribution
from FNA
CO; NM; WY
from FNA
ID; NV; OR
[BONAP county map]
Discussion

Artemisia pattersonii can be distinguished from the closely related A. scopulorum by its heads being borne singly and narrower phyllary margins.

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

The pappose cypselae make Artemisia papposa anomalous within Artemisia. Artemisia papposa has capitulescence characteristics that suggest a relationship to Sphaeromeria.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 520. FNA vol. 19, p. 531.
Parent taxa Asteraceae > tribe Anthemideae > Artemisia > subg. Absinthium 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. packardiae, A. palmeri, A. papposa, 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. 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 A. monocephala, A. scopulorum var. monocephala
Name authority A. Gray: in A. Gray et al., Syn. Fl. N. Amer. ed. 2, 1(2): 453. (1886) S. F. Blake & Cronquist: Leafl. W. Bot. 6: 43, plate 1. (1950)
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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