Flora of North America species comparison

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Baccharis bigelovii

Bigelow's false willow
Habit Shrubs, 30–100 cm (branched from bases).
Stems

erect to ascending, slender, striate-angled, glabrous, resinous.
Leaves

present at flowering; short-petiolate;

blades (1- or obscurely 3-nerved) obovate to oblanceolate, 20–35 × 3–15 mm, distally reduced and narrowed, bases cuneate, margins irregularly incised to coarsely serrate or 2-serrate, faces glabrous, gland-dotted, resinous.
Involucres

campanulate;

staminate 4–5 mm, pistillate 4–5 mm.
Pistillate florets

25–30;

corollas 2–2.6 mm.
Staminate florets

15–20;

corollas 3.5–4 mm.
Phyllaries

lanceolate, 1–4 mm, margins scarious, medians green, apices acute, erose.
Heads

(20–50) in corymbiform arrays.
Cypselae

1.5–2.2 mm, 5-nerved, glabrous;

pappi 3–4.5 mm.

Baccharis bigelovii
Phenology Flowering Aug–Nov.
Habitat Dry rocky ground in coniferous forests
Elevation 1300–2000 m (4300–6600 ft)
Distribution
from FNA
AZ; NM; TX; Mexico (Chihuahua, Durango, Sonora)
[BONAP county map]
Discussion

Baccharis bigelovii occurs in the general Chihuahuan Desert region in the Davis Mountains of West Texas, and in the Chiricahua and Huachuca mountains of Arizona. It is recognized by the relatively short stature, obovate, coarsely and irregularly serrate leaves, erose-ciliate phyllaries, and 5-nerved cypselae. It is similar to B. thesioides, which differs mainly by having narrower, more oblong leaves with more evenly serrate margins and spinulose teeth. Further investigation may show these two taxa to be different geographic expressions of a single species centered in Mexico.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 26.
Parent taxa Asteraceae > tribe Astereae > Baccharis
Sibling taxa
B. angustifolia, B. brachyphylla, B. dioica, B. glomeruliflora, B. glutinosa, B. halimifolia, B. havardii, B. malibuensis, B. neglecta, B. pilularis, B. plummerae, B. pteronioides, B. salicifolia, B. salicina, B. sarothroides, B. sergiloides, B. texana, B. thesioides, B. vanessae, B. wrightii
Name authority A. Gray: in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 84. (1859)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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