Baccharis havardii
Baccharis salicifolia
Havard's false willow
mule's fat, mule-fat, seepwillow, water wally
erect (green to tan), slender, striate-angled, glabrous, resinous.
spreading to ascending, green to tan, simple proximally, sparingly branched distally, striate-angled, glabrous or minutely hairy, resinous and ± resin-varnished.
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 (abundant, well developed);
sessile or petiolate;
blades lanceolate-elliptic, slightly falcate (willowlike), 30–150 × 3–20 mm, bases attenuate, margins usually finely serrate from bases to apices, sometimes entire, apices acute to acuminate, faces glabrous, gland-dotted, ± resinous.
cylindro-campanulate;
staminate 3 mm, pistillate 4–4.5 mm.
hemispheric;
staminate 3–6 mm, pistillate involucres 3–6 mm.
15–20;
corollas 3 mm.
50–150;
corollas 2–3.5 mm.
12–15;
corollas 3–4 mm.
(10–)17–48;
corollas 4–6 mm.
lanceolate, 1–4 mm, margins scarious, medians green or brownish, apices obtuse to acuminate (thickened, slightly erose and ciliate).
ovate to lanceolate, 2–4 mm, margins scarious, erose or irregularly dentate, midribs distinct, medians green or reddish, apices (greenish or brownish purple) obtuse to acuminate (pale and dry, glabrous).
in broad paniculiform arrays.
in terminal, compound corymbiform arrays (often involving distal branches).
2–2.5 mm, 5-nerved, glabrous;
pappi 4 mm.
0.8–1.5 mm, 5-nerved, glabrous;
pappi 3–6 mm.
= 18, 36.
Baccharis havardii
Baccharis salicifolia
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 salicifolia is part of a complex that extends through the southwestern United States, Mexico, Central America, and South America to Argentina and Chile (J. Cuatrecasas 1968). It is recognized by the narrowly lanceolate, willowlike, finely serrate leaves with acute or acuminate apices, smallish heads in dense clusters, reddish phyllaries, and 5-nerved cypselae. By tagging and measuring individual plants throughout the year, D. H. Wilken (1972) demonstrated that B. salicifolia has distinct seasonal forms. The North American plants were once known as B. glutinosa or B. viminea, which were differentiated from each other by differences in woodiness, leaf size and serration, and flowering time.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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