Baccharis bigelovii
Baccharis vanessae
Bigelow's false willow
Encinitas baccharis, Encinitas false willow or baccharis, encinitis false willow
erect to ascending, slender, striate-angled, glabrous, resinous.
erect, slender, rounded, smooth, glabrous or stipitate-glandular proximal to heads.
present at flowering; short-petiolate;
blades (1- or obscurely 3-nerved) obovate to oblanceolate, 20–35 × 3–15 mm, distally reduced and narrowed, bases cuneate, margins irregularly incised to coarsely serrate or 2-serrate, 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.
campanulate;
staminate 4–5 mm, pistillate 4–5 mm.
funnelform;
staminate 3–5 mm, pistillate 3–5 mm.
25–30;
corollas 2–2.6 mm.
ca. 25;
corollas 2.5 mm.
15–20;
corollas 3.5–4 mm.
15–22;
corollas 4 mm.
lanceolate, 1–4 mm, margins scarious, medians green, apices acute, erose.
lanceolate (not keeled), 1–4 mm, margins ciliate, chartaceous, apices acute to acuminate (abaxial faces scurfy-glandular).
(20–50) in corymbiform arrays.
borne singly or in (pedunculate clusters) in loose paniculiform or racemiform arrays.
1.5–2.2 mm, 5-nerved, glabrous;
pappi 3–4.5 mm.
2–3 mm, 10-nerved, glabrous or ciliate along nerves;
pappi 7–10 mm.
= 18.
Baccharis bigelovii
Baccharis vanessae
Baccharis bigelovii occurs in the general Chihuahuan Desert region in the Davis Mountains of West Texas, and in the Chiricahua and Huachuca mountains of Arizona. It is recognized by the relatively short stature, obovate, coarsely and irregularly serrate leaves, erose-ciliate phyllaries, and 5-nerved cypselae. It is similar to B. thesioides, which differs mainly by having narrower, more oblong leaves with more evenly serrate margins and spinulose teeth. Further investigation may show these two taxa to be different geographic expressions of a single species centered in Mexico.
(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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