Baccharis havardii
Baccharis glutinosa
Havard's false willow
Douglas' falsewillow, marsh baccharis, salt marsh baccharis
erect (green to tan), slender, striate-angled, glabrous, resinous.
erect to ascending, striate, glabrous, gland-dotted, 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 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.
cylindro-campanulate;
staminate 3 mm, pistillate 4–4.5 mm.
hemispheric;
staminate 3.5–5 mm, pistillate 3.8–4.8(–6) mm.
15–20;
corollas 3 mm.
80–150;
corollas 1.7–3 mm.
12–15;
corollas 3–4 mm.
26–40;
corollas 3.5–4 mm.
lanceolate, 1–4 mm, margins scarious, medians green or brownish, apices obtuse to acuminate (thickened, slightly erose and ciliate).
narrowly lanceolate, 2–4 mm, inner series ± equal, margins yellowish, medians green to purplish, apices acuminate, erose or ciliate, faces glabrous, gland-dotted, resinous.
in broad paniculiform arrays.
in dense, terminal, flat-topped, corymbiform arrays.
2–2.5 mm, 5-nerved, glabrous;
pappi 4 mm.
0.6–1.5 mm, 5-nerved, glandular, hispidulous distally;
pappi 2.6–4(–7) mm.
= 18.
Baccharis havardii
Baccharis glutinosa
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.)
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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