Baccharis sergiloides

A. Gray

in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 83. 1859.

Common names: Desert baccharis squaw false willow
Treatment appears in FNA Volume 20. Treatment on page 33. Mentioned on page 25.

Shrubs, 50–200 cm (freely branched, broomlike). Stems erect, fastigiate, striate-angular, green, glabrous, resinous. Leaves cauline (proximal withering and sparse by flowering); sessile; blades (1-nerved) broadly oblanceolate to obovate or spatulate, 10–35 × 5–15 mm (thick, firm), bases attenuate, margins entire or irregularly serrate (teeth 1–4, distal leaves entire), apices obtuse to acute, faces glabrous, gland-dotted, resinous. Heads (sessile or short-pedunculate on lateral branches) in crowded paniculiform arrays. Involucres funnelform to campanulate; staminate 3–5 mm, pistillate 3–5 mm. Phyllaries ovate to linear-lanceolate, 1–5 mm, margins scarious, erose, medians green, apices rounded to acute, glabrous, gland-dotted, resinous. Staminate florets 24–33; corollas 2–3.5 mm. Pistillate florets 15–30; corollas 1.6–2.7 mm. Cypselae 1–2 mm, prominently 10-nerved, glabrous; pappi 1.7–3.1 mm. 2n = 18.

Phenology: Flowering Jul–Oct.
Habitat: Gravelly or sandy streambeds, dry washes, grasslands
Elevation: 100–1800 m



Ariz., Calif., Nev., Utah, Mexico (Baja California, Sonora).


Baccharis sergiloides is recognized by its fastigiate, broomlike habit, and large obovate leaves that often wither before flowering. It differs from B. sarothroides in its larger leaves, more or less sessile and lateral heads, and smaller florets and fruits.

Selected References


Lower Taxa

... more about "Baccharis sergiloides"
Scott D. Sundberg† +  and David J. Bogler +
A. Gray +
Desert baccharis +  and squaw false willow +
Ariz. +, Calif. +, Nev. +, Utah +, Mexico (Baja California +  and Sonora). +
100–1800 m +
Gravelly or sandy streambeds, dry washes, grasslands +
Flowering Jul–Oct. +
in W. H. Emory, Rep. U.S. Mex. Bound. +
Compositae +
Baccharis sergiloides +
Baccharis +
species +