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- 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.
... more about "Gutierrezia petradoria"
Guy L. Nesom +
(S. L. Welsh & S. Goodrich) S. L. Welsh +
Xanthocephalum petradoria +
Goldenrod snakeweed +
1800–2700 m +
Rocky ridges, crevices, and slopes, quartzite or limestone substrate, sagebrush, mountain mahogany, white fir communities +
Flowering Aug–Oct(–Nov). +
Great Basin Naturalist +
Compositae +
Gutierrezia petradoria +
Gutierrezia +
species +