Baccharis glutinosa
Baccharis thesioides
Douglas' falsewillow, marsh baccharis, salt marsh baccharis
Arizona baccharis, Mogollon baccharis
erect to ascending, striate, glabrous, gland-dotted, resinous.
erect to ascending, slender, striate-angled, glabrous, scarcely 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.
usually present at flowering;
sessile;
blades (1-nerved) linear-oblanceolate to narrowly oblong, 20–40(–80) × 4–8 mm, bases cuneate, margins evenly serrate (teeth spinulose, apices acute, faces finely gland-dotted, not resinous).
hemispheric;
staminate 3.5–5 mm, pistillate 3.8–4.8(–6) mm.
campanulate;
staminate 3–6 mm, pistillate 3–6 mm.
80–150;
corollas 1.7–3 mm.
30;
corollas 2.2–3 mm.
26–40;
corollas 3.5–4 mm.
20–30;
corollas 3 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.
lanceolate, 1–5 mm, margins scarious, erose-ciliate, medians green, apices acute or obtuse (erose, abaxial faces glabrous).
in dense, terminal, flat-topped, corymbiform arrays.
(10–50+) in terminal, compact, rounded paniculiform arrays.
0.6–1.5 mm, 5-nerved, glandular, hispidulous distally;
pappi 2.6–4(–7) mm.
1.5–2.2 mm, 5-nerved, glabrous;
pappi 4–6 mm.
= 18.
Baccharis glutinosa
Baccharis thesioides
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 thesioides is recognized by its erect stems, narrow, oblong, evenly serrate leaves with finely spinulose teeth, heads in relatively small rounded arrays, and 5-ribbed cypselae with short pappi. It is sometimes confused with B. bigelovii, which has broader and irregularly serrate leaves. The two taxa may belong to the same species complex centered in Mexico.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
