Flaveria campestris

J. R. Johnston

Proc. Amer. Acad. Arts 39: 287. 1903.

Common names: Alkali yellowtops
IllustratedEndemic
Treatment appears in FNA Volume 21. Treatment on page 250. Mentioned on page 247, 248.

Annuals, 18–70 (–90) cm (delicate or robust, mostly glabrous). Stems usually erect (tufted-pubescent at nodes). Leaves sessile; bladeslinear-lanceolate to lanceolate, 30–90 × 6–22 mm, bases barely connate, margins strongly to weakly serrate or spinulose-serrate. heads (10–) 15–100+, in tight subglomerules in corymbiform arrays. calyculi of 2 linear-lanceolate bractlets 1–3 mm. involucres urceolate or oblong, 6–7 mm. phyllaries 3, elliptic, obovate, or oblong-obovate. ray-florets 0 or 1, laminae yellow, ovate, 1.5–2.5 mm (apices notched). Disc-florets 5–6 (–8);, corolla-tubes 0.8–1.3 mm, throats funnelform, 1.2–1.7 mm. Cypselae oblanceolate, linear, or oblong, 2.8–3.6 mm (those of rays longer by ca. 0.2 mm), pappi 0.2n = 36 (18).


Phenology: Flowering May–Nov.
Habitat: Saline soils, lake, pond, stream margins, flood plains, and disturbed pastures
Elevation: 1000–1800 m

Distribution

V21-618-distribution-map.gif

Ariz., Colo., Kans., Mo., N.Mex., Okla., Tex., Utah.

Discussion

Flaveria campestris is distinguished by subglomerulate capitulescences with 5–6(–8) florets per head, subtended by 3 leafy bracts, keeled phyllaries, and linear-lanceolate leaves with serrate or spinulose-serrate margins, and its distribution. The prevalence of F. campestris fluctuates greatly from year to year, generally depending on the existence of wet, saline habitat.

Selected References

None.

Lower Taxa

None.
... more about "Flaveria campestris"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Sharon C. Yarborough +  and A. Michael Powell +
J. R. Johnston +
connate +
decurrent +
compound +  and simple +
oblong-ovate;lanceolate or linear +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
linear-lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
barbellulate +  and barbellate +
Alkali yellowtops +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
yellow +  and whitish +
hairy +  and glabrous +
oblong +, linear +  and oblanceolate +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Colo. +, Kans. +, Mo. +, N.Mex. +, Okla. +, Tex. +  and Utah. +
1000–1800 m +
short-pubescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Saline soils, lake, pond, stream margins, flood plains, and disturbed pastures +
discoid +  and radiate +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
oblong;urceolate +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
30mm;90mm +
bladeslinear-lanceolate;lanceolate +
0.6 cm6 mm <br />0.006 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
deltate +
spinulose-serrate +  and serrate +
toothed +  and entire +
2-carpellate +
persistent +
coroniform +
Flowering May–Nov. +
Proc. Amer. Acad. Arts +
bearing subulate enations +, hairy +  and bristly +
2 +  and 4 +
exalbuminous +
Illustrated +  and Endemic +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Flaveria campestris +
Flaveria +
species +
campanulate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
70 cm700 mm <br />0.7 m <br /> (90 cm900 mm <br />0.9 m <br />) +
18 cm180 mm <br />0.18 m <br /> (70 cm700 mm <br />0.7 m <br />) +