Baccharis thesioides
Baccharis salicina
Arizona baccharis, Mogollon baccharis
Great Plains false willow, willow-baccharis
erect to ascending, slender, striate-angled, glabrous, scarcely resinous.
ascending, striate-angled, glabrous, smooth or minutely roughened, 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).
present at flowering (numerous and well developed); short-petiolate;
blades (at least broader distinctly 3-nerved) oblong to oblanceolate, 25–70 × 5–10(–20) mm, bases tapering attenuate, margins usually serrate distally (teeth 1–3, coarse irregular, ca. 5 mm apart), sometimes entire, apices acute or obtuse, faces finely gland-dotted.
campanulate; staminate 3–6 mm, pistillate 3–6 mm.
narrowly obconic to campanulate; staminate 4–7 mm, pistillate 5–9 mm.
30;
corollas 2.2–3 mm.
25–30;
corollas 3–4 mm.
20–30;
corollas 3 mm.
20–25;
corollas 3–5 mm.
lanceolate, 1–5 mm, margins scarious, erose-ciliate, medians green, apices acute or obtuse (erose, abaxial faces glabrous).
lanceolate, 2–6 mm, margins scarious, medians green or reddish, apices greenish or purplish, often erose-ciliate, faces glabrous, gland-dotted, resinous.
(10–50+) in terminal, compact, rounded paniculiform arrays.
(100–200+, short-pedunculate or sessile) in (large, crowded, leafy) paniculiform arrays.
1.5–2.2 mm, 5-nerved, glabrous;
pappi 4–6 mm.
1.2–2 mm, irregularly 8–10-nerved, glabrous;
pappi 8–12 mm (elongating in fruit).
Baccharis thesioides
Baccharis salicina
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 salicina is recognized by its narrow, gland-dotted leaves with 1–3 irregular teeth on the distal half, heads in loose leafy arrays, campanulate involucres, and cypselae with 8–10 ribs.
The recognition of Baccharis emoryi as a separate species in other floras has been based on its wider, glabrous, eglandular leaves, more cylindric pistillate involucres, and dense whitish pappi. It was said to occur both west of the Rocky Mountains and in western Texas. In our study, expressions of the characters used to distinguish B. emoryi from other species were found to be inconsistent and inadequate to warrant recognition as a distinct species. There appears to be a complex of up to four species—emoryi, salicina, neglecta and angustifolia—that intergrade from west to east. Characteristics progress from broader leaves and larger heads (emoryi form of salicina) to narrow leaves with small heads (neglecta, angustifolia). The delimitation of taxa within this complex merits further investigation.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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