Artemisia palmeri

A. Gray

Proc. Amer. Acad. Arts 11: 79. 1876.

Common names: Palmer sagewort
Synonyms: Artemisiastrum palmeri (A. Gray) Rydberg
Treatment appears in FNA Volume 19. Mentioned on page 531.

Subshrubs, 100–350 cm, mildly aromatic. Stems usually 1–15, erect, brown, simple (wandlike, brittle, bases woody), glabrous. Leaves cauline (petiolate), bicolor (gray-green and dark green); blades broadly lanceolate, 3.5–12 (–15) × 0.2–10 cm, relatively deeply and coarsely pinnately lobed (lobes 3–7+), faces canescent (abaxial) or glabrous or sparsely hairy (adaxial). Heads (erect or nodding, peduncles relatively slender) in open, paniculiform arrays, 15–40 × 3–10 cm (widely branched). Involucres globose, 2.5–3.5 × 2–5 mm. Phyllaries (pale green to stramineous) broadly ovate, glabrous or sparsely hairy (receptacles paleate). Florets: pistillate 0; bisexual 8–30; corollas pale-yellow, 1.5–2.2 mm, resinous-glandular (style-branches exsert, truncate, erose). Cypselae (light-brown, shiny) ellipsoid, 1–1.2 mm, (4-angled), glabrous or glandular. 2n = 18.


Phenology: Flowering early–mid summer.
Habitat: Ravines, coastal areas, sandy soils
Elevation: 100–300 m

Distribution

V19-920-distribution-map.gif

Calif., Mexico (Baja California)

Discussion

Of conservation concern.

Artemisia palmeri is known only from drainages near the coast, from northeast of San Diego to just south of Ensenada. Most of its habitat has been destroyed by urban development. It is of particular interest because of its paleate receptacles, an anomalous trait that confounds our understanding of its evolutionary relationship to other species of Artemisia.

Selected References

None.

Lower Taxa

None.
... more about "Artemisia palmeri"
not tailed +  and obtuse +
scarious +
paniculiform +  and open +
indeterminate +  and determinate +
Leila M. Shultz +
A. Gray +
decurrent +
compound +  and simple +
12 cm120 mm <br />0.12 m <br /> (15 cm150 mm <br />0.15 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (12 cm120 mm <br />0.12 m <br />) +
lobed;lanceolate +
0.2cm;10cm +
fertile +  and bisexual +
Palmer sagewort +
zygomorphic +, actinomorphic +  and (3-)5-merous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
winged +  and monomorphic +
glandular +  and glabrous +
ellipsoid +
fertile +  and bisexual +
fertile +  and bisexual +
Calif. +  and Mexico (Baja California) +
100–300 m +
gland-dotted +
hairy +, glabrous +  and canescent +
peripheral +
winged +  and beaked +
dispersed +
Ravines, coastal areas, sandy soils +
spiciform +  and racemiform +
in subcapitate clusters +  and singly +
indeterminate +
15 cm150 mm <br />0.15 m <br /> (40 cm400 mm <br />0.4 m <br />) +
heterogamous +  and homogamous +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
each +  and sessile +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
sessile +  and petiolate +
persistent +  and deciduous +
deltate +
entire +  and dentate +
2-carpellate +
persistent +
Flowering early–mid summer. +
hairy +  and glabrous +
2 +  and 20 +
Proc. Amer. Acad. Arts +
styliferous +, neuter +  and pistillate +
sterile +  and fertile +
conic;convex;conic;convex;flat +
2 +  and 5 +
exalbuminous +
1 +  and 15 +
wand-like +
appendaged +  and truncate +
papillate +
Artemisiastrum palmeri +
Artemisia palmeri +
Artemisia subg. Artemisia +
species +
funnel +  and subglobose +
cylindric +
fibrous-rooted +  and taprooted +
perennial +, biennial +  and annual +