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Bigelow sage, Bigelow sagebrush, Bigelow sagewort, Bigelow's sage

Porter mugwort, Porter's wormwood

Habit Shrubs, 20–40(–60) cm (branched from bases, rounded), mildly aromatic; not root-sprouting. Perennials or subshrubs, (7–)8–14 cm (cespitose), faintly aromatic.
Stems

silvery, canescent (bark gray-brown).

5–8, silver-gray, densely tomentose.

Leaves

persistent, light gray-green;

blades narrowly cuneate, 0.5–3 × 0.2–0.5 cm, entire or 3(–5)-lobed (lobes 1.5–2 mm, less than 1/3 blade lengths, acute), faces silvery canescent.

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

globose, 2–3 × 1.5–2.5 mm.

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

Florets

pistillate 0–2 (raylike, laminae to 1 mm);

bisexual 1–3;

corollas 1–1.5 mm (style branches of ray florets elongate, exsert, epapillate, tips acute; of disc florets, short, truncate, papillate).

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

corollas pale yellow, 2.2–4.5 mm, glandular.

Phyllaries

(8–15) ovate, canescent or tomentose.

(ovate, margins broadly scarious) densely tomentose.

Heads

(usually nodding) in arrays 6–25 × 1–4 cm (branches erect, somewhat curved).

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

(ellipsoid, 5-ribbed) 0.8–1 mm, glabrous.

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

2n

= 18, 36, 72.

Artemisia bigelovii

Artemisia porteri

Phenology Flowering early summer–late fall. Flowering mid–late summer.
Habitat Deserts, sandy or alkaline soils, rock outcrops Barren clay and gravelly soils
Elevation 1000–2500 m (3300–8200 ft) 1800–2000 m (5900–6600 ft)
Distribution
from FNA
AZ; CA; CO; NM; NV; TX; UT
[WildflowerSearch map]
[BONAP county map]
from FNA
MT; WY
[BONAP county map]
Discussion

Artemisia bigelovii of the southwestern deserts is easily confused in the field with A. tridentata, even though it is well distinguished ecologically and morphologically. Systematic placement within subg. Tridentatae remains problematic. Presence of “ray” florets (though rare) and vestigial spines on the pollen (R. P. Wodehouse 1935) suggest a relationship with groups ancestral to Tridentatae. The species also has the unusual characteristic of lignified trichomes (L. M. Shultz 1986b). Further research may help to determine proper placement; its affinities may be with members of subg. Artemisia.

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

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. 512. FNA vol. 19, p. 509.
Parent taxa Asteraceae > tribe Anthemideae > Artemisia > subg. Tridentatae Asteraceae > tribe Anthemideae > Artemisia > subg. Drancunculus
Sibling taxa
A. abrotanum, A. absinthium, A. alaskana, A. aleutica, A. annua, A. arbuscula, A. biennis, 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. 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
Synonyms A. petrophila, Seriphidium bigelovii
Name authority A. Gray: in War Department [U.S.], Pacif. Railr. Rep. 4(5): 110. (1857) Cronquist: Madroño 11: 145. (1951)
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