Baccharis havardii
Baccharis bigelovii
Havard's false willow
Bigelow's false willow
erect (green to tan), slender, striate-angled, glabrous, resinous.
erect to ascending, slender, striate-angled, glabrous, resinous.
present at flowering; short-petiolate;
blades (1-nerved) narrowly spatulate to linear, 20–40 × 2–3 mm, reduced to bracts distally, bases attenuate, margins entire or toothed (teeth to 2 mm), faces glabrous, gland-dotted, resinous.
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.
cylindro-campanulate;
staminate 3 mm, pistillate 4–4.5 mm.
campanulate;
staminate 4–5 mm, pistillate 4–5 mm.
15–20;
corollas 3 mm.
25–30;
corollas 2–2.6 mm.
12–15;
corollas 3–4 mm.
15–20;
corollas 3.5–4 mm.
lanceolate, 1–4 mm, margins scarious, medians green or brownish, apices obtuse to acuminate (thickened, slightly erose and ciliate).
lanceolate, 1–4 mm, margins scarious, medians green, apices acute, erose.
in broad paniculiform arrays.
(20–50) in corymbiform arrays.
2–2.5 mm, 5-nerved, glabrous;
pappi 4 mm.
1.5–2.2 mm, 5-nerved, glabrous;
pappi 3–4.5 mm.
Baccharis havardii
Baccharis bigelovii
Found mainly in the Chisos and Davis Mountains of West Texas, Baccharis havardii is distinguished by its short bushy habit, narrow leaves with elongate teeth, and 5-nerved cypselae. G. L. Nesom (pers. comm.) suggested that it is weakly defined and further investigation may demonstrate it should be included in the Mexican species B. sulcata de Candolle (which name would have priority over B. havardii).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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