Baccharis havardii
Baccharis neglecta
Havard's false willow
linear-leaf false willow, roosevelt or New Deal weed, rooseveltweed
erect (green to tan), slender, striate-angled, glabrous, resinous.
(sometimes in clumps) erect, striate-angled, glabrous, eglandular.
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.
present at flowering;
sessile;
blades (1-nerved, lateral veins obscure) narrowly elliptic to linear, 30–80 × 1–2(–5) mm (moderately thick), bases narrowly attenuate, margins entire or serrate with 2–3 small teeth, apices acute, faces glabrous, gland-dotted (distal reduced, entire).
cylindro-campanulate;
staminate 3 mm, pistillate 4–4.5 mm.
cylindro-campanulate;
staminate 3.5–4 mm, pistillate 4–5 mm.
15–20;
corollas 3 mm.
15–30;
corollas 2.5–3.3 mm.
12–15;
corollas 3–4 mm.
10–15;
corollas 2.7–3.3 mm.
lanceolate, 1–4 mm, margins scarious, medians green or brownish, apices obtuse to acuminate (thickened, slightly erose and ciliate).
ovate to lanceolate, 1–3 mm, margins yellowish, often scarious, medians green or reddish, apices acute to acuminate (often purplish, sometimes erose).
in broad paniculiform arrays.
(axillary and terminal on lateral branches) in pyramidal, paniculiform arrays.
2–2.5 mm, 5-nerved, glabrous;
pappi 4 mm.
1–1.5 mm, 10-nerved, glabrous;
pappi 7–12 mm.
Baccharis havardii
Baccharis neglecta
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.)
As circumscribed here, Baccharis neglecta is known north of Mexico only from central Texas, mostly on the Edwards Plateau. It is recognized by its tall and erect habit, very narrow leaves with small shallow teeth, pyramidal arrays, and 10-ribbed cypselae. It is most similar to B. salicina and may represent a xeromorphic, narrow-leaf form or variety of that species. Baccharis neglecta invades rangelands and pastures, forming dense stands. It is an especially aggressive invader of land converted from crops to pasture and it is a prolific seed producer; it readily resprouts when burned or cut.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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