Baccharis thesioides
Baccharis texana
Arizona baccharis, Mogollon baccharis
prairie baccharis or false willow, prairie false willow
erect to ascending, slender, striate-angled, glabrous, scarcely resinous.
simple, erect or procumbent, rigid (woody proximally), herbaceous and leafy distally (dying back annually), striate-angled, glabrous, non-resinous.
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).
present at flowering;
sessile;
blades (1-nerved) linear to narrowly lanceolate, 10–40 × 1–4 mm, bases narrowed, margins minutely undulate, apices acute, faces glabrous, gland-dotted (distal leaves reduced, scalelike).
campanulate; staminate 3–6 mm, pistillate 3–6 mm.
campanulate; staminate 4–7 mm, pistillate 7–9 mm.
30;
corollas 2.2–3 mm.
20–30;
corollas 3.5–4 mm.
20–30;
corollas 3 mm.
15–20;
corollas 4–5 mm.
lanceolate, 1–5 mm, margins scarious, erose-ciliate, medians green, apices acute or obtuse (erose, abaxial faces glabrous).
lanceolate, 1–7 mm, margins scarious, erose-ciliate, medians green (midribs dark, keeled, dilated), apices acute to acuminate (erose-ciliate, abaxial faces glabrous, minutely papillose-gland-dotted).
(10–50+) in terminal, compact, rounded paniculiform arrays.
(on short peduncles) in loose corymbiform arrays.
1.5–2.2 mm, 5-nerved, glabrous;
pappi 4–6 mm.
3–5 mm, prominently 6–8-nerved, glabrous;
pappi 11–14 mm.
Baccharis thesioides
Baccharis texana
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.)
Baccharis texana is recognized by its low, subshrub habit, simple, more or less herbaceous and leafy stems arising from woody bases, narrow leaves with minutely undulate margins, large pedunculate heads, and erose-ciliate phyllaries with dilated midribs.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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