Baccharis texana
Baccharis havardii
prairie baccharis or false willow, prairie false willow
Havard's false willow
simple, erect or procumbent, rigid (woody proximally), herbaceous and leafy distally (dying back annually), striate-angled, glabrous, non-resinous.
erect (green to tan), slender, striate-angled, glabrous, 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).
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.
campanulate;
staminate 4–7 mm, pistillate 7–9 mm.
cylindro-campanulate;
staminate 3 mm, pistillate 4–4.5 mm.
20–30;
corollas 3.5–4 mm.
15–20;
corollas 3 mm.
15–20;
corollas 4–5 mm.
12–15;
corollas 3–4 mm.
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).
lanceolate, 1–4 mm, margins scarious, medians green or brownish, apices obtuse to acuminate (thickened, slightly erose and ciliate).
(on short peduncles) in loose corymbiform arrays.
in broad paniculiform arrays.
3–5 mm, prominently 6–8-nerved, glabrous;
pappi 11–14 mm.
2–2.5 mm, 5-nerved, glabrous;
pappi 4 mm.
Baccharis texana
Baccharis havardii
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.)
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.)
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