Baccharis neglecta

Britton in N. L. Britton and A. Brown

in N. L. Britton and A. Brown, Ill. Fl. N. U.S. 3: 394, fig. 3835. 1898.

Common names: Roosevelt or New Deal weed linear-leaved false willow
Treatment appears in FNA Volume 20. Treatment on page 29. Mentioned on page 24, 25, 28, 33.

Shrubs, 100–450 cm (not broomlike). Stems (sometimes in clumps) erect, striate-angled, glabrous, eglandular. Leaves present at flowering; sessile; blades (1-nerved, lateral-veins obscure) narrowly elliptic to linear, 30–80 × 1–2 (–5) mm (moderately thick), bases narrowly attenuate, margins entire or serrate with 2–3 small teeth, apices acute, faces glabrous, gland-dotted (distal reduced, entire). Heads (axillary and terminal on lateral branches) in pyramidal, paniculiform arrays. Involucres cylindro-campanulate; staminate 3.5–4 mm, pistillate 4–5 mm. Phyllaries ovate to lanceolate, 1–3 mm, margins yellowish, often scarious, medians green or reddish, apices acute to acuminate (often purplish, sometimes erose). Staminate florets 10–15; corollas 2.7–3.3 mm. Pistillate florets 15–30; corollas 2.5–3.3 mm. Cypselae 1–1.5 mm, 10-nerved, glabrous; pappi 7–12 mm.


Phenology: Flowering Aug–Nov.
Habitat: Disturbed habitats, old fields, pastures, roadsides, streambeds
Elevation: 200–600 m

Distribution

V20-18-distribution-map.gif

Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (Nuevo León), Mexico (San Luis Potosí), Mexico (Tamaulipas)

Discussion

As circumscribed here, Baccharis neglecta is known north of Mexico only from central Texas, mostly on the Edwards Plateau. It is recognized by its tall and erect habit, very narrow leaves with small shallow teeth, pyramidal arrays, and 10-ribbed cypselae. It is most similar to B. salicina and may represent a xeromorphic, narrow-leaf form or variety of that species. Baccharis neglecta invades rangelands and pastures, forming dense stands. It is an especially aggressive invader of land converted from crops to pasture and it is a prolific seed producer; it readily resprouts when burned or cut.

Selected References

None.

Lower Taxa

None.
... more about "Baccharis neglecta"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
pyramidal +
Scott D. Sundberg† +  and David J. Bogler +
Britton in N. L. Britton and A. Brown +
attenuate +
3-nerved +  and 1-nerved +
elliptic to linear +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
rhombic;obovate;rhombic;obovate;oblong;ovate;lanceolate;linear +
1mm;2mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
Roosevelt or New Deal weed +  and linear-leaved false willow +
not 2-lipped +  and actinomorphic +
whitish +, white +  and pale-yellow +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
compressed +, obovoid +  and cylindric +
fertile +  and bisexual +
Tex. +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Nuevo León) +, Mexico (San Luis Potosí) +  and Mexico (Tamaulipas) +
200–600 m +
resinous +
gland-dotted +
pistillate +  and staminate +
winged +  and beaked +
dispersed +
Disturbed habitats, old fields, pastures, roadsides, streambeds +
racemiform +, corymbiform +  and paniculiform +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
pistillate +  and staminate +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
cylindro-campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
spreading-reflexed;spreading-reflexed +
less deltate +  and lanceovate +
serrate +  and entire +
elliptic to linear +  and elliptic +
hispid +  and glabrous +
reddish +  and green +
2-carpellate +
brownish +, whitish +  and tawny +
persistent +
25 +  and 50 +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Flowering Aug–Nov. +
ovate +  and lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
in N. L. Britton and A. Brown, Ill. Fl. N. U.S. +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
conic;tholiform;conic;tholiform;flat +
exalbuminous +
1 (?) +  and 20 (?) +
resinous +
striate-angled +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Baccharis neglecta +
Baccharis +
species +