Baccharis glutinosa
Baccharis pteronioides
Douglas' falsewillow, marsh baccharis, salt marsh baccharis
yerba de pasmo
erect to ascending, striate, glabrous, gland-dotted, resinous.
erect, terete, brittle, slightly striate, scabrous, stipitate-glandular, papillose-roughened.
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.
cauline (proximal withering before flowering, distal crowded in gascicles);
sessile;
blades linear to lanceolate or spatulate, 5–25 × 1–6 mm (stiff, coriaceous to fleshy), bases attenuate, margins sharply serrate (teeth 1–5 pairs, distal leaves often entire), faces glabrous, gland-dotted, resinous.
hemispheric; staminate 3.5–5 mm, pistillate 3.8–4.8(–6) mm.
campanulate; staminate 4–5 mm, pistillate 5–6(–7) mm.
80–150;
corollas 1.7–3 mm.
15–20;
corollas 4–5 mm.
26–40;
corollas 3.5–4 mm.
15–20;
corollas 4–5 mm.
narrowly lanceolate, 2–4 mm, inner series ± equal, margins yellowish, medians green to purplish, apices acuminate, erose or ciliate, faces glabrous, gland-dotted, resinous.
ovate to lanceolate, 1–5 mm, margins scarious, medians green, apices acute to acuminate, glabrous.
in dense, terminal, flat-topped, corymbiform arrays.
(10–20+ on densely leafy lateral branchlets) in spreading racemiform arrays.
0.6–1.5 mm, 5-nerved, glandular, hispidulous distally;
pappi 2.6–4(–7) mm.
1.8–3 mm, 8–10-nerved, minutely papillose-glandular;
pappi 8–10 mm (bristles rigid).
= 18.
Baccharis glutinosa
Baccharis pteronioides
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.)
Baccharis pteronioides is characterized by its shrubby stiff habit, rough gray bark, branches that are evenly spaced and often at 45° angles, fascicles of narrow sessile leaves, and heads in racemiform arrays on short leafy branches. The Mexican common name yerba de pasmo refers to an infusion of the leaves used to treat chills (pasmo) and sores; the plants are also said to be poisonous to cattle and sheep.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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PNW Herbaria
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