Flora of North America species comparison

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Artemisia porteri

Porter mugwort, Porter's wormwood
Habit Perennials or subshrubs, (7–)8–14 cm (cespitose), faintly aromatic.
Stems

5–8, silver-gray, densely 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.
Involucres

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

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

corollas pale yellow, 2.2–4.5 mm, glandular.
Phyllaries

(ovate, margins broadly scarious) densely tomentose.
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.
Cypselae

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

Artemisia porteri
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]
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.)
Source FNA vol. 19, p. 509.
Parent taxa 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
Name authority Cronquist: Madroño 11: 145. (1951)
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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