Baccharis bigelovii
Baccharis glutinosa
Bigelow's false willow
Douglas' falsewillow, marsh baccharis, salt marsh baccharis
erect to ascending, slender, striate-angled, glabrous, resinous.
erect to ascending, striate, 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.
present at flowering; short-petiolate;
blades (1- or 3-nerved, larger prominently 3-nerved) lanceolate, 50–130 × 8–30 mm, bases tapered to petioles, margins entire or finely dentate, apices acute to acuminate, faces glabrous, black gland-dotted.
campanulate;
staminate 4–5 mm, pistillate 4–5 mm.
hemispheric;
staminate 3.5–5 mm, pistillate 3.8–4.8(–6) mm.
25–30;
corollas 2–2.6 mm.
80–150;
corollas 1.7–3 mm.
15–20;
corollas 3.5–4 mm.
26–40;
corollas 3.5–4 mm.
lanceolate, 1–4 mm, margins scarious, medians green, apices acute, erose.
narrowly lanceolate, 2–4 mm, inner series ± equal, margins yellowish, medians green to purplish, apices acuminate, erose or ciliate, faces glabrous, gland-dotted, resinous.
(20–50) in corymbiform arrays.
in dense, terminal, flat-topped, corymbiform arrays.
1.5–2.2 mm, 5-nerved, glabrous;
pappi 3–4.5 mm.
0.6–1.5 mm, 5-nerved, glandular, hispidulous distally;
pappi 2.6–4(–7) mm.
= 18.
Baccharis bigelovii
Baccharis glutinosa
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.)
Occurring along the coast and in interior valleys, Baccharis glutinosa is recognized by the erect, simple stems growing in patches from rhizomes, large lanceolate leaves with three veins and blackish glandular dots, heads in dense, compact, terminal, corymbiform arrays and more or less uniform inner phyllaries. G. L. Nesom (1990h) noted that it is similar to forms of the South American species Baccharis pingraea de Candolle, and that the two taxa may be conspecific.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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