Baccharis havardii
Baccharis sarothroides
Havard's false willow
broom baccharis, desert broom, greasewood, groundsel, rosin-brush
erect (green to tan), slender, striate-angled, glabrous, resinous.
erect, striate, sharply angled, green distally, glabrous, resinous.
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.
cauline (proximal withered and/or sparse at flowering);
sessile;
blades (1-nerved) linear-lanceolate, 5–15 × 1–2 mm, reduced to scales distally, thick, bases narrowed, margins entire (often revolute), apices acute, faces glabrous, minutely gland-dotted, resinous.
cylindro-campanulate;
staminate 3 mm, pistillate 4–4.5 mm.
cylindric to hemispheric;
staminate 4–5.2 mm, pistillate 3–8 mm.
15–20;
corollas 3 mm.
19–31;
corollas 2.5–3.5 mm.
12–15;
corollas 3–4 mm.
18–35;
corollas 4.2–5 mm.
lanceolate, 1–4 mm, margins scarious, medians green or brownish, apices obtuse to acuminate (thickened, slightly erose and ciliate).
ovate to lanceolate, 1–5 mm, margins yellowish, slightly scarious, medians green to yellow, apices rounded to acute (greenish, abaxial faces glabrous, resinous).
in broad paniculiform arrays.
borne singly (on nearly leafless branches) or (laterally on branchlets) in dense paniculiform arrays.
2–2.5 mm, 5-nerved, glabrous;
pappi 4 mm.
2–2.6 mm, finely 8–10-nerved, glabrous;
pappi 7–12 mm.
= 18.
Baccharis havardii
Baccharis sarothroides
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.)
Baccharis sarothroides is recognized by its broomlike habit, narrow, sharply angular, nearly leafless, green stems, soon-withering proximal leaves, scalelike distal leaves, and heads often terminal on long branches. Specimens from California have smaller heads that sometimes are arranged laterally along the stems.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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