Baccharis thesioides
Baccharis vanessae
Arizona baccharis, Mogollon baccharis
Encinitas baccharis, Encinitas false willow or baccharis, encinitis false willow
erect to ascending, slender, striate-angled, glabrous, scarcely resinous.
erect, slender, rounded, smooth, glabrous or stipitate-glandular proximal to heads.
usually present at flowering;
sessile;
blades (1-nerved) linear-oblanceolate to narrowly oblong, 20–40(–80) × 4–8 mm, bases cuneate, margins evenly serrate (teeth spinulose, apices acute, faces finely gland-dotted, not 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 3–6 mm, pistillate 3–6 mm.
funnelform; staminate 3–5 mm, pistillate 3–5 mm.
30;
corollas 2.2–3 mm.
ca. 25;
corollas 2.5 mm.
20–30;
corollas 3 mm.
15–22;
corollas 4 mm.
lanceolate, 1–5 mm, margins scarious, erose-ciliate, medians green, apices acute or obtuse (erose, abaxial faces glabrous).
lanceolate (not keeled), 1–4 mm, margins ciliate, chartaceous, apices acute to acuminate (abaxial faces scurfy-glandular).
(10–50+) in terminal, compact, rounded paniculiform arrays.
borne singly or in (pedunculate clusters) in loose paniculiform or racemiform arrays.
1.5–2.2 mm, 5-nerved, glabrous;
pappi 4–6 mm.
2–3 mm, 10-nerved, glabrous or ciliate along nerves;
pappi 7–10 mm.
= 18.
Baccharis thesioides
Baccharis vanessae
Baccharis thesioides is recognized by its erect stems, narrow, oblong, evenly serrate leaves with finely spinulose teeth, heads in relatively small rounded arrays, and 5-ribbed cypselae with short pappi. It is sometimes confused with B. bigelovii, which has broader and irregularly serrate leaves. The two taxa may belong to the same species complex 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.)
WildflowerSearch
iNaturalist
USDA Plants Database
CA
