Artemisia porteri

Cronquist

Madroño 11: 145. 1951.

Common names: Porter mugwort
Endemic
Treatment appears in FNA Volume 19. Treatment on page 509. Mentioned on page 505.

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. 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. Involucres broadly campanulate, 4–5 (–7) × 2–3 mm. Phyllaries (ovate, margins broadly scarious) densely tomentose. Florets: pistillate 8–10 (2–2.8 mm); functionally staminate 22–32; corollas pale-yellow, 2.2–4.5 mm, glandular. Cypselae (light-brown) ellipsoid, flattened (faintly nerved), 1.5–2 mm, sparsely hairy, glabrous or resinous.


Phenology: Flowering mid–late summer.
Habitat: Barren clay and gravelly soils
Elevation: 1800–2000 m

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.

Selected References

None.

Lower Taxa

None.
... more about "Artemisia porteri"
not tailed +  and obtuse +
scarious +
paniculiform +
indeterminate +  and determinate +
Leila M. Shultz +
Cronquist +
decurrent +
compound +  and simple +
entire;toothed;3-lobed;entire;toothed;3-lobed;lobed;spatulate;flabellate;spatulate;flabellate;cuneate;obovate;oblanceolate;oblong;elliptic;ovate;lanceolate;linear;filiform +
Porter mugwort +
zygomorphic +, actinomorphic +  and (3-)5-merous +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
winged +  and monomorphic +
glabrous +  and hairy +
flattened +  and ellipsoid +
fertile +  and bisexual +
fertile +  and bisexual +
Mont. +  and Wyo. +
1800–2000 m +
gland-dotted +
staminate +  and pistillate +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
winged +  and beaked +
dispersed +
Barren clay and gravelly soils +
spiciform +  and racemiform +
in paniculiform arrays +  and singly +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
indeterminate +
4 cm40 mm <br />0.04 m <br /> (9 cm90 mm <br />0.09 m <br />) +
heterogamous +  and homogamous +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
campanulate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
sessile +  and petiolate +
silver-green +
persistent +
deltate +
2mm +  and 3mm +
entire +  and dentate +
2-carpellate +
persistent +
Flowering mid–late summer. +
2 +  and 20 +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
styliferous +, neuter +  and pistillate +
sterile +  and fertile +
conic;convex;conic;convex;flat +
2 +  and 5 +
exalbuminous +
silver-gray +
5 +  and 8 +
wand-like +
appendaged +  and truncate +
papillate +
Compositae +
Artemisia porteri +
Artemisia subg. Drancunculus +
species +
funnel +  and subglobose +
cylindric +
taprooted +  and fibrous-rooted +
7 cm70 mm <br />0.07 m <br /> (8 cm80 mm <br />0.08 m <br />) +
8 cm80 mm <br />0.08 m <br /> (14 cm140 mm <br />0.14 m <br />) +
taprooted +  and fibrous-rooted +