Artemisia rothrockii

A. Gray in W. H. Brewer et al.

in W. H. Brewer et al., Bot. California 1: 618. 1876.

Common names: Rothrock or sticky sagebrush
Endemic
Synonyms: Artemisia tridentata subsp. rothrockii (A. Gray) H. M. Hall & Clements Seriphidium rothrockii (A. Gray) W. A. Weber
Treatment appears in FNA Volume 19. Treatment on page 515. Mentioned on page 503, 510, 511.

Shrubs, 20–50 cm (sticky-resinous and dark green throughout), pungently aromatic; not root-sprouting (trunks relatively narrow). Stems white (becoming dark gray with age), canescent (bark exfoliating). Leaves persistent, light or dark gray-green; blades long-cuneate to lanceolate, (0.4–) 1–1.5 (–2) × 0.2–0.4 cm, 3-lobed (lobes to 1/3 blade lengths, rounded, margins sometimes entire, somewhat wavy), faces densely to sparsely canescent, gland-dotted, sticky-resinous. Heads (erect, sessile or pedunculate) in paniculiform arrays, 5–15 × 1–2 (–3) cm. Involucres broadly ovoid, 3–5 × 4–6 mm. Phyllaries (usually gray-green) ovate, densely or sparsely canescent. Florets 12–20; corollas 2.5–3.5 mm. Cypselae 0.8–2 mm, (smooth), resinous. 2n = 36, 54, 72.


Phenology: Flowering mid summer–all.
Habitat: Clay soils of mountain meadows
Elevation: 2500–3100 m

Discussion

Artemisia rothrockii is known only from the central and southern Sierra Nevada and the White Mountains of California. In the Rocky Mountains, A. spiciformis has been confused with A. rothrockii. Distinctive chemistry and anatomical structure of the leaves support the distinctness of A. rothrockii (L. M. Shultz 1986b). Intermediate characteristics suggest a hybrid origin from races of A. cana and A. tridentata.

Selected References

None.

Lower Taxa

None.
... more about "Artemisia rothrockii"
72 +, 54 +  and 36 +
not tailed +  and obtuse +
scarious +
paniculiform +
indeterminate +  and determinate +
Leila M. Shultz +
A. Gray in W. H. Brewer et al. +
decurrent +
Tridentatae +
compound +  and simple +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
3-lobed;long-cuneate;lanceolate +
0.2cm;0.4cm +
Rothrock or sticky sagebrush +
zygomorphic +, actinomorphic +  and (3-)5-merous +
red +  and pale-yellow +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
winged +  and monomorphic +
fertile +  and bisexual +
fertile +  and bisexual +
2500–3100 m +
sticky-resinous +
gland-dotted +
pistillate +, staminate +  and neuter +
fertile +  and bisexual +
winged +  and beaked +
dispersed +
Clay soils of mountain meadows +
spiciform +  and racemiform +
in subcapitate clusters +  and singly +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
indeterminate +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
heterogamous +  and homogamous +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
each +  and sessile +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
sessile +  and petiolate +
dark gray-green +  and light +
persistent +
cauline +  and basal +
deltate +
entire +  and dentate +
2-carpellate +
persistent +
Flowering mid summer–all. +
2 +  and 20 +
in W. H. Brewer et al., Bot. California +
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 tridentata subsp. rothrockii +  and Seriphidium rothrockii +
Artemisia rothrockii +
Artemisia subg. Tridentatae +
species +
funnel +  and subglobose +
cylindric +
perennial +, biennial +  and annual +
shrub +  and not root-sprouting +