Baccharis texana
Baccharis salicina
prairie baccharis or false willow, prairie false willow
Great Plains false willow, willow-baccharis
simple, erect or procumbent, rigid (woody proximally), herbaceous and leafy distally (dying back annually), striate-angled, glabrous, non-resinous.
ascending, striate-angled, glabrous, smooth or minutely roughened, resinous.
present at flowering;
sessile;
blades (1-nerved) linear to narrowly lanceolate, 10–40 × 1–4 mm, bases narrowed, margins minutely undulate, apices acute, faces glabrous, gland-dotted (distal leaves reduced, scalelike).
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 4–7 mm, pistillate 7–9 mm.
narrowly obconic to campanulate;
staminate 4–7 mm, pistillate 5–9 mm.
20–30;
corollas 3.5–4 mm.
25–30;
corollas 3–4 mm.
15–20;
corollas 4–5 mm.
20–25;
corollas 3–5 mm.
lanceolate, 1–7 mm, margins scarious, erose-ciliate, medians green (midribs dark, keeled, dilated), apices acute to acuminate (erose-ciliate, abaxial faces glabrous, minutely papillose-gland-dotted).
lanceolate, 2–6 mm, margins scarious, medians green or reddish, apices greenish or purplish, often erose-ciliate, faces glabrous, gland-dotted, resinous.
(on short peduncles) in loose corymbiform arrays.
(100–200+, short-pedunculate or sessile) in (large, crowded, leafy) paniculiform arrays.
3–5 mm, prominently 6–8-nerved, glabrous;
pappi 11–14 mm.
1.2–2 mm, irregularly 8–10-nerved, glabrous;
pappi 8–12 mm (elongating in fruit).
Baccharis texana
Baccharis salicina
Baccharis texana is recognized by its low, subshrub habit, simple, more or less herbaceous and leafy stems arising from woody bases, narrow leaves with minutely undulate margins, large pedunculate heads, and erose-ciliate phyllaries with dilated midribs.
(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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