Baccharis angustifolia
Baccharis thesioides
narrowleaf baccharis, saltwater false willow
Arizona baccharis, Mogollon baccharis
erect to ascending, slender, striate, glabrous, resinous.
erect to ascending, slender, striate-angled, glabrous, scarcely resinous.
present at flowering;
sessile;
blades (1-nerved) 20–60 × 1–2(–5) mm, ± succulent, bases narrowly attenuate, margins mostly entire, apices acute, faces glabrous, not 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).
campanulate; staminate 3–4 mm, pistillate 3.5–5 mm.
campanulate; staminate 3–6 mm, pistillate 3–6 mm.
15–20;
corollas ca. 3 mm.
30;
corollas 2.2–3 mm.
15–20;
corollas 2.5 mm.
20–30;
corollas 3 mm.
ovate to lanceolate, 1–4 mm, margins scarious, medians green, sometimes purplish, apices green to purplish, obtuse to acute.
lanceolate, 1–5 mm, margins scarious, erose-ciliate, medians green, apices acute or obtuse (erose, abaxial faces glabrous).
(in groups of 3–5 near branch tips) in broad paniculiform arrays (of 100+).
(10–50+) in terminal, compact, rounded paniculiform arrays.
1–2 mm, 10-nerved, glabrous;
pappi 6–8 mm.
1.5–2.2 mm, 5-nerved, glabrous;
pappi 4–6 mm.
Baccharis angustifolia
Baccharis thesioides
Baccharis angustifolia is most commonly found in brackish, marshy areas near the coast of Atlantic and Gulf coastal plains. It is easily recognized by its 1-nerved, relatively narrow and fleshy, entire leaves, and the more or less pyramidal arrays of relatively small heads. Rarely, some specimens have slightly broader leaves with an occasional tooth, perhaps due to introgression with B. halimifolia.
(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.)
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