Gutierrezia petradoria

(S. L. Welsh & S. Goodrich) S. L. Welsh

Great Basin Naturalist 43: 288. 1983.

Common names: Goldenrod snakeweed
Endemic
Basionym: Xanthocephalum petradoria S. L. Welsh & S. Goodrich Brittonia 33: 301. 1981
Treatment appears in FNA Volume 20. Treatment on page 93. Mentioned on page 90.

Perennials, 10–40 cm. Stems minutely scabro-hirtellous. Leaves: basal persistent at flowering; cauline blades mostly 3-nerved or 5-nerved, linear-spatulate to linear, proximal 1–3 (–4) mm wide, narrower distally. Heads borne singly or (2–4) in loose arrays. Involucres broadly turbinate to obconic, 4–7 mm diam. Phyllary apices flat, ± swollen. Ray-florets (4–) 5–10; corollas yellow, 5–8 (–10) mm. Disc-florets 15–23 (bisexual and fertile or functionally staminate). Cypselae 1.5–3 (–3.5) mm, faces without oil cavities, loosely strigose (hair apices acute); pappi of 1–2 series of scales (0.5–) 1–2.2 mm. 2n = 8.


Phenology: Flowering Aug–Oct(–Nov).
Habitat: Rocky ridges, crevices, and slopes, quartzite or limestone substrate, sagebrush, mountain mahogany, white fir communities
Elevation: 1800–2700 m

Discussion

Gutierrezia petradoria is distinctive, especially in its herbaceous form. The basal leaves are persistent, and the relatively large ray corollas are showy.

Selected References

None.

Lower Taxa

None.

"[" is not declared as a valid unit of measurement for this property."]" is not declared as a valid unit of measurement for this property.No values specified.

... more about "Gutierrezia petradoria"
hirtellous +, hispidulous +  and glabrous +
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Guy L. Nesom +
(S. L. Welsh & S. Goodrich) S. L. Welsh +
decurrent +
white-indurate +
Xanthocephalum petradoria +
compound +  and simple +
linear;lanceolate or spatulate +
rugulose +  and muricate +
barbellulate +  and barbellate +
5-nerved +  and 3-nerved +
linear-spatulate +  and linear +
Goldenrod snakeweed +
not 2-lipped +  and actinomorphic +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
not compressed +, cylindric +  and clavate +
fertile +  and bisexual +
fertile +  and bisexual +
1800–2700 m +
resinous +
gland-dotted +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky ridges, crevices, and slopes, quartzite or limestone substrate, sagebrush, mountain mahogany, white fir communities +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
broadly turbinate;obconic +
petiolate +  and sessile +
cauline +  and basal +
short-deltate +
2-carpellate +
erose-margined +
persistent +
of 5-10 whitish +  and coroniform +
Flowering Aug–Oct(–Nov). +
3-nerved +  and 1-nerved +
ovate +  and lanceolate +
Great Basin Naturalist +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
erect +  and ascending +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Gutierrezia petradoria +
Gutierrezia +
species +
150 cm1,500 mm <br />1.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
10 cm100 mm <br />0.1 m <br /> (40 cm400 mm <br />0.4 m <br />) +