Baccharis havardii
Baccharis vanessae
Havard's false willow
Encinitas baccharis, Encinitas false willow or baccharis, encinitis false willow
erect (green to tan), slender, striate-angled, glabrous, resinous.
erect, slender, rounded, smooth, glabrous or stipitate-glandular proximal to heads.
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.
often withering and sparse by flowering;
sessile;
blades (1-nerved) filiform to linear-oblanceolate, 10–30 × 1–3 mm (slightly fleshy), bases narrowed, margins entire (revolute), apices acute (mucronate), faces glabrous, gland-dotted.
cylindro-campanulate;
staminate 3 mm, pistillate 4–4.5 mm.
funnelform;
staminate 3–5 mm, pistillate 3–5 mm.
15–20;
corollas 3 mm.
ca. 25;
corollas 2.5 mm.
12–15;
corollas 3–4 mm.
15–22;
corollas 4 mm.
lanceolate, 1–4 mm, margins scarious, medians green or brownish, apices obtuse to acuminate (thickened, slightly erose and ciliate).
lanceolate (not keeled), 1–4 mm, margins ciliate, chartaceous, apices acute to acuminate (abaxial faces scurfy-glandular).
in broad paniculiform arrays.
borne singly or in (pedunculate clusters) in loose paniculiform or racemiform arrays.
2–2.5 mm, 5-nerved, glabrous;
pappi 4 mm.
2–3 mm, 10-nerved, glabrous or ciliate along nerves;
pappi 7–10 mm.
= 18.
Baccharis havardii
Baccharis vanessae
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.)
Of conservation concern.
Baccharis vanessae is highly localized in chaparral remnants in relictual Torrey Pine forests of coastal San Diego County. It is distinguished from other species of Baccharis by its filiform leaves and delicate, ciliate phyllaries that reflex at maturity.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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