Baccharis thesioides
Baccharis sergiloides
Arizona baccharis, Mogollon baccharis
desert baccharis, squaw false willow
erect to ascending, slender, striate-angled, glabrous, scarcely resinous.
erect, fastigiate, striate-angular, green, glabrous, resinous.
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).
cauline (proximal withering and sparse by flowering);
sessile;
blades (1-nerved) broadly oblanceolate to obovate or spatulate, 10–35 × 5–15 mm (thick, firm), bases attenuate, margins entire or irregularly serrate (teeth 1–4, distal leaves entire), apices obtuse to acute, faces glabrous, gland-dotted, resinous.
campanulate; staminate 3–6 mm, pistillate 3–6 mm.
funnelform to campanulate; staminate 3–5 mm, pistillate 3–5 mm.
30;
corollas 2.2–3 mm.
15–30;
corollas 1.6–2.7 mm.
20–30;
corollas 3 mm.
24–33;
corollas 2–3.5 mm.
lanceolate, 1–5 mm, margins scarious, erose-ciliate, medians green, apices acute or obtuse (erose, abaxial faces glabrous).
ovate to linear-lanceolate, 1–5 mm, margins scarious, erose, medians green, apices rounded to acute, glabrous, gland-dotted, resinous.
(10–50+) in terminal, compact, rounded paniculiform arrays.
(sessile or short-pedunculate on lateral branches) in crowded paniculiform arrays.
1.5–2.2 mm, 5-nerved, glabrous;
pappi 4–6 mm.
1–2 mm, prominently 10-nerved, glabrous;
pappi 1.7–3.1 mm.
= 18.
Baccharis thesioides
Baccharis sergiloides
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.)
Baccharis sergiloides is recognized by its fastigiate, broomlike habit, and large obovate leaves that often wither before flowering. It differs from B. sarothroides in its larger leaves, more or less sessile and lateral heads, and smaller florets and fruits.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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