Flora of North America species comparison

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Artemisia tilesii

Artemisia serrata

Aleutian mugwort, Cascade wormwood, Tilesius' wormwood

sawtooth wormwood, serrate-leaf sage
Habit Perennials, 20–60(–80) cm, mildly aromatic (rhizomes coarse). Perennials, 50–100(–300) cm (not cespitose), pleasantly aromatic (fibrous-rooted, rhizomes horizontal, relatively short).
Stems

1–3, erect, white, tomentose (on distal branches, hairs appressed) or glabrate.

2–5, erect, brown, mostly simple (bases woody), sparsely tomentose.
Leaves

basal and cauline, bicolor (white and green);

blades (basal) linear to broadly lanceolate, 3–7(–10) × 2–5(–6) cm, coarsely pinnately lobed (cauline becoming linear distally), faces tomentose (abaxial) or glabrous (adaxial).

cauline, bicolor (white and green);

blades lanceolate, 7–15 × 1–2.5 cm, serrate (teeth ca. 2 mm), faces densely tomentose (abaxial) or glabrate (adaxial).
Involucres

broadly campanulate, 4–5 × 3.5–4 mm.

campanulate, 2.5–3 × 2–2.5 mm.
Florets

pistillate 9;

bisexual 25–60;

corollas yellow, 1.5–3 mm, glabrous (style branches included, erect, linear, relatively short, short-ciliate).

pistillate 3–5;

bisexual 9–10;

corollas pale yellow, 1.5–2 mm, sparsely glandular.
Phyllaries

(violet-brown) oval (outer) to elliptic or lanceolate, sparsely tomentose.

lanceolate (margins hyaline), densely tomentose.
Heads

in compact to broadly branched, paniculiform arrays 1–20 × 2–6 cm.

(peduncles 0 or to 2 mm) in racemiform arrays 10–15 × 5–15 cm.
Cypselae

oblong-linear (angular), 1.2–1.5 mm, glabrous.

ellipsoid, ca. 1 mm, glabrous.
2n

= 18, 36.

= 36.

Artemisia tilesii

Artemisia serrata
Phenology Flowering mid summer–early fall. Flowering mid summer–early fall.
Habitat Arctic and alpine tundra, sandy, rocky slopes near shorelines Grasslands and barren areas on high plains
Elevation 0–2000 m (0–6600 ft) 500–1800 m (1600–5900 ft)
Distribution
from FNA
AK; ID; MT; OR; WA; AB; BC; MB; NT; NU; ON; QC; SK; YT; Asia (Russia)
[WildflowerSearch map]
[BONAP county map]
from FNA
IA; IL; MN; ND; NY; WI
[WildflowerSearch map]
Discussion

Artemisia tilesii has a bewildering array of variation in leaf and inflorescence morphology that has been separated into four infraspecific taxa recognized in some floras. I am unable to separate these taxa consistently and am including them within a broad circumscription of the species.

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

Artemisia serrata is closely related to A. ludoviciana and A. longifolia; it is distinguished by its prominent, serrated leaf margins. It is apparently native to the upper Mississippi Valley and naturalized in New York, presumably following introduction as a garden plant. Reports from Kansas and Missouri may be based on collections of A. ludoviciana.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 533. FNA vol. 19, p. 532.
Parent taxa Asteraceae > tribe Anthemideae > Artemisia > subg. Artemisia 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. 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. 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. rothrockii, A. rupestris, A. scopulorum, A. senjavinensis, A. spiciformis, A. stelleriana, A. suksdorfii, A. tilesii, A. tridentata, A. tripartita, A. vulgaris
Synonyms A. hookeriana, A. hultenii, A. tilesii var. aleutica, A. tilesii var. elatior, A. tilesii subsp. gormanii, A. tilesii subsp. hultenii, A. tilesii var. unalaschcensis, A. unalaskensis var. aleutica, A. vulgaris subsp. tilesii A. vulgaris subsp. serrata
Name authority Ledebour: Mém. Acad. Imp. Sci. St. Pétersbourg Hist. Acad. 5: 568. (1814) Nuttall: Gen. N. Amer. Pl. 2: 142. (1818)
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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