Artemisia bigelovii

A. Gray in War Department [U.S.]

in War Department [U.S.], Pacif. Railr. Rep. 4(5): 110. 1857.

Common names: Bigelow sagebrush
Endemic
Synonyms: Artemisia petrophila Wooton & Standley Seriphidium bigelovii (A. Gray) K. Bremer & Humphries
Treatment appears in FNA Volume 19. Treatment on page 512. Mentioned on page 503, 504, 509, 510.
Revision as of 19:47, 29 July 2020 by imported>Volume Importer
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Shrubs, 20–40 (–60) cm (branched from bases, rounded), mildly aromatic; not root-sprouting. Stems silvery, canescent (bark gray-brown). 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. Heads (usually nodding) in arrays 6–25 × 1–4 cm (branches erect, somewhat curved). Involucres globose, 2–3 × 1.5–2.5 mm. Phyllaries (8–15) ovate, canescent or tomentose. 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). Cypselae (ellipsoid, 5-ribbed) 0.8–1 mm, glabrous. 2n = 18, 36, 72.


Phenology: Flowering early summer–late fall.
Habitat: Deserts, sandy or alkaline soils, rock outcrops
Elevation: 1000–2500 m

Distribution

V19-866-distribution-map.gif

Ariz., Calif., Colo., Nev., N.Mex., Tex., Utah.

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.

Selected References

None.

Lower Taxa

None.
... more about "Artemisia bigelovii"
72 +, 36 +  and 18 +
not tailed +  and obtuse +
scarious +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Leila M. Shultz +
A. Gray in War Department [U.S.] +
decurrent +
Tridentatae +
compound +  and simple +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3(-5)-lobed;entire;cuneate +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Bigelow sagebrush +
zygomorphic +, actinomorphic +  and (3-)5-merous +
red +  and pale-yellow +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
winged +  and monomorphic +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Calif. +, Colo. +, Nev. +, N.Mex. +, Tex. +  and Utah. +
1000–2500 m +
winged +  and beaked +
dispersed +
Deserts, sandy or alkaline soils, rock outcrops +
spiciform +  and racemiform +
in subcapitate clusters +  and singly +
indeterminate +
6 cm60 mm <br />0.06 m <br /> (25 cm250 mm <br />0.25 m <br />) +
heterogamous +  and homogamous +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
each +  and sessile +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
sessile +  and petiolate +
light gray-green +
persistent +
cauline +  and basal +
deltate +
entire +  and dentate +
2-carpellate +
persistent +
Flowering early summer–late fall. +
tomentose +  and canescent +
2 +  and 20 +
in War Department [U.S.], Pacif. Railr. Rep. +
styliferous +, neuter +  and pistillate +
sterile +  and fertile +
conic;convex;conic;convex;flat +
2 +  and 5 +
exalbuminous +
1 +  and 10 +
not wand-like +
appendaged +  and truncate +
papillate +
Artemisia petrophila +  and Seriphidium bigelovii +
Artemisia bigelovii +
Artemisia subg. Tridentatae +
species +
funnel +  and subglobose +
cylindric +
perennial +, biennial +  and annual +
40 cm400 mm <br />0.4 m <br /> (60 cm600 mm <br />0.6 m <br />) +
shrub +  and not root-sprouting +