Gamochaeta argyrinea

G. L. Nesom

Sida 21: 718, figs. 1-4. 2004.

Common names: Silvery cudweed
Treatment appears in FNA Volume 19. Treatment on page 435. Mentioned on page 432, 436.

Annuals (winter-annuals), 12–40 cm; usually fibrous-rooted, rarely taprooted. Stems decumbent-ascending, closely white-pannose (hairs usually individually evident, seldom forming clothlike induments). Leaves basal and cauline, basal present through flowering, blades oblanceolate to oblanceolate-oblong or oblanceolate-obovate, 1.5–5 (–8) cm × 5–12 (–18) mm (gradually smaller distally), faces bicolor, abaxial closely white-pannose, adaxial sparsely arachnose (evident at 10×). Heads initially in continuous, cylindric arrays 1.5–5 cm × 10–12 mm (pressed), later sometimes interrupted, 5–18 cm × 10–12 mm (pressed; producing axillary glomerules from proximal nodes). Involucres campanulate, 3–3.5 mm, bases sparsely arachnose. Phyllaries in 4–6 series, outer (tawny-transparent, never dark-brown) ovate to ovatelanceolate, lengths 1/3–4/5 inner, apices acute to acuminate, inner elliptic-oblong to oblong, laminae often purplish tinged (around stereome/lamina junction, otherwise hyaline and slightly brownish), apices truncate-rounded, apiculate (flexing slightly outward in fruit). Florets: bisexual 4–5 (–6); all corollas purple to yellowbrown distally. Cypselae (tan) 0.5–0.6 mm.


Phenology: Flowering Mar–Jun(–Oct).
Habitat: Roadsides, fields, lawns, open woods, sand or clayey soils, open, disturbed areas
Elevation: 0–300 m

Distribution

V19-716-distribution-map.gif

Ala., Ark., Fla., Ga., Kans., Ky., La., Md., Miss., N.C., Okla., Pa., S.C., Tenn., Tex., Va., W.Va., West Indies

Discussion

Gamochaeta argyrinea has been confused with G. purpurea, which also occurs across the coastal states of eastern United States (G. L. Nesom 2004).

Selected References

None.

Lower Taxa

None.
... more about "Gamochaeta argyrinea"
gray +  and white +
acute +  and acuminate +
scarious +
mostly ovate +  and lanceovate or linear +
indeterminate +  and determinate +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
cylindric +
10mm +  and 12mm +
Guy L. Nesom +
G. L. Nesom +
cuneate +  and more or less cordate +
compound +  and simple +
5 cm50 mm <br />0.05 m <br /> (8 cm80 mm <br />0.08 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
oblanceolate;oblanceolate-oblong or oblanceolate-obovate +
5mm;12mm +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
Silvery cudweed +
actinomorphic +
purple +  and yellowbrown +
flattened +  and oblong +
Ala. +, Ark. +, Fla. +, Ga. +, Kans. +, Ky. +, La. +, Md. +, Miss. +, N.C. +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +, Va. +, W.Va. +  and West Indies +
0–300 m +
winged +  and beaked +
dispersed +
Roadsides, fields, lawns, open woods, sand or clayey soils, open, disturbed areas +
papilliform +
interrupted +
singly +  and aggregated +
indeterminate +
5 cm50 mm <br />0.05 m <br /> (18 cm180 mm <br />0.18 m <br />) +
homogamous +  and heterogamous +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
each +  and sessile +
campanulate +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
purplish tinged +
basal +  and cauline +
rarely lanceovate +  and lanceolate +
ovate +  and ovatelanceolate +
2-carpellate +
persistent +
Flowering Mar–Jun(–Oct). +
conic;more or less columnar +
exalbuminous +
decumbent-ascending +
appendaged +  and truncate +
papillate +
Gnaphalium sect. Gamochaeta +  and Gnaphalium subg. Gamochaeta +
Gamochaeta argyrinea +
Gamochaeta +
species +
taprooted +  and fibrous-rooted +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
12 cm120 mm <br />0.12 m <br /> (40 cm400 mm <br />0.4 m <br />) +
shrub +  and subshrub +