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Porter mugwort, Porter's wormwood

boreal wormwood, field sagewort

Habit Perennials or subshrubs, (7–)8–14 cm (cespitose), faintly aromatic. Perennials, (6–)8–20(–40) cm (cespitose), mildly aromatic; taprooted, caudices branched.
Stems

5–8, silver-gray, densely tomentose.

(1–)2–5, gray-green, tomentose.

Leaves

persistent, silver-green, mostly basal;

proximalmost blades 3–4 × 1–1.5 cm, 1-pinnately lobed, lobes mostly 2–3 mm wide;

blades of flowering stems somewhat reduced, (1–)2–3(–5) × 0.15 cm, mostly entire;

apices rounded, faces densely hairy.

persistent, basal rosettes persistent, gray-green to white;

blades ovate, 2–4 × 0.5–1 cm, 2–3-pinnately or -ternately lobed, lobes linear to narrowly oblong, apices acute, faces moderately to densely sericeous.

Involucres

broadly campanulate, 4–5(–7) × 2–3 mm.

hemispheric, 3–4 × 3.5–4 mm.

Florets

pistillate 8–10 (2–2.8 mm); functionally staminate 22–32;

corollas pale yellow, 2.2–4.5 mm, glandular.

pistillate 8–10; functionally staminate 15–30;

corollas (or lobes) yellow-orange or deep red, 2.2–3.5.

Phyllaries

(ovate, margins broadly scarious) densely tomentose.

(obscurely scarious) densely tomentose-villous.

Heads

borne singly or (clustered in 2s and 3s on lateral branches; peduncles 0 or to 5 mm) in paniculiform arrays, (2–)4–9 × 1–1.5(–2) cm.

(proximal sessile, distal pedunculate) in (leafy) spiciform arrays 4–9(–12) × (0.5–)1–5 cm.

Cypselae

(light brown) ellipsoid, flattened (faintly nerved), 1.5–2 mm, sparsely hairy, glabrous or resinous.

oblong-lanceoloid, somewhat compressed, 0.4–1 mm, faintly nerved, glabrous.

Artemisia porteri

Artemisia borealis

Phenology Flowering mid–late summer.
Habitat Barren clay and gravelly soils
Elevation 1800–2000 m (5900–6600 ft)
Distribution
from FNA
MT; WY
[BONAP county map]
from FNA
AK; CA; CO; ID; MT; UT; WA; WY; AB; BC; NT; NU; SK; YT; especially at high elevations and northern latitudes; Eurasia
[WildflowerSearch map]
[BONAP county map]
Discussion

Although Cronquist observed that Artemisia porteri may be an autopolyploid derivative of A. pedatifida, morphologic similarities to northerly cespitose taxa suggest a more complex origin.

Artemisia porteri is in the Center for Plant Conservation’s National Collection of Endangered Plants.

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

Subspecies 2 (2 in the flora).

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

Key
1. Herbage villoso-tomentose, glabrate, or glabrous; corollas (at least lobes) usually yellow-orange, 2.2–3 mm; mountains, w North America
subsp. borealis
1. Herbage white-hoary; corollas (at least lobes) deep red, 3–3.5 mm; w arctic North America
subsp. richardsoniana
Source FNA vol. 19, p. 509. FNA vol. 19, p. 505.
Parent taxa Asteraceae > tribe Anthemideae > Artemisia > subg. Drancunculus Asteraceae > tribe Anthemideae > Artemisia > subg. Drancunculus
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. pattersonii, A. pedatifida, A. pontica, 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. 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. borealis subsp. borealis, A. borealis subsp. richardsoniana
Synonyms A. campestris subsp. borealis
Name authority Cronquist: Madroño 11: 145. (1951) Pallas: Reise Russ. Reich. 3: 755. (1776)
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