Baccharis texana
Baccharis bigelovii
prairie baccharis or false willow, prairie false willow
Bigelow's false willow
simple, erect or procumbent, rigid (woody proximally), herbaceous and leafy distally (dying back annually), striate-angled, glabrous, non-resinous.
erect to ascending, slender, striate-angled, glabrous, 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; 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.
campanulate;
staminate 4–7 mm, pistillate 7–9 mm.
campanulate;
staminate 4–5 mm, pistillate 4–5 mm.
20–30;
corollas 3.5–4 mm.
25–30;
corollas 2–2.6 mm.
15–20;
corollas 4–5 mm.
15–20;
corollas 3.5–4 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, 1–4 mm, margins scarious, medians green, apices acute, erose.
(on short peduncles) in loose corymbiform arrays.
(20–50) in corymbiform arrays.
3–5 mm, prominently 6–8-nerved, glabrous;
pappi 11–14 mm.
1.5–2.2 mm, 5-nerved, glabrous;
pappi 3–4.5 mm.
Baccharis texana
Baccharis bigelovii
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 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.)
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