Gamochaeta coarctata

(Willdenow) Kerguélen

Lejeunia 120: 104. 1987.

Common names: Elegant cudweed
IntroducedIllustrated
Basionym: Gnaphalium coarctatum Willdenow Sp. Pl. 3: 1886. 1803,
Synonyms: Gamochaeta spicata Cabrera
Treatment appears in FNA Volume 19. Treatment on page 435. Mentioned on page 432, 436.

Winter-annuals or biennials, 15–35 (–50) cm; fibrous-rooted. Stems decumbent-ascending, white-pannose (tomentum usually sheathlike). Leaves basal and cauline, basal present (in rosettes) at flowering, blades spatulate to oblanceolate-obovate, (1.5–) 3–8 (–12) cm × 6–15 (–22) mm (gradually or little smaller distally, slightly succulent, margins often crenulate on drying), faces bicolor, abaxial closely white-pannose, adaxial glabrous or glabrate. Heads initially usually in dense, continuous spiciform arrays 2–20 cm × 10–14 mm (pressed), later branched, interrupted. Involucres cylindro-campanulate, 2.5–3 mm, bases glabrous. Phyllaries in 4–5 series, outer (purplish or rosy) elliptic-obovate to broadly ovate-elliptic, lengths 1/3–1/4 inner, apices rounded to obtuse, inner oblong, laminae brown-hyaline, apices rounded to obtuse or blunt, apiculate. Florets: bisexual 2–3; all corollas usually purplish distally. Cypselae (tan) 0.5–0.6 mm. 2n = 28, 40.


Phenology: Flowering Apr–Jun.
Habitat: Ditches, low roadsides, sidewalk cracks, shaded spots around buildings, other shaded, moist habitats
Elevation: 0–150 m

Distribution

V19-718-distribution-map.gif

Introduced; Ala., Ark., Calif., Fla., Ga., La., Miss., N.C., S.C., Tex., Va., South America, also in Mexico, West Indies, Europe, Asia, Pacific Islands (New Zealand), Australia

Discussion

Gamochaeta coarctata is native to South America and is also introduced in Mexico. R. K. Godfrey (1958) identified specimens of G. coarctata as Gnaphalium spicatum Lamarck. Some specimens from the flora area were misidentified by G. L. Nesom (1990f) as Gamochaeta americana (Miller) Weddell, which was described from Jamaica; it is widespread in Central America and Mexico, and has not been observed in the flora area.

Selected References

None.

Lower Taxa

None.
... more about "Gamochaeta coarctata"
gray +  and white +
glabrate +  and glabrous +
rounded +  and obtuse +
rounded;obtuse or blunt +
scarious +
mostly ovate +  and lanceovate or linear +
spiciform +  and continuous +
indeterminate +  and determinate +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
10mm +  and 14mm +
Guy L. Nesom +
(Willdenow) Kerguélen +
cuneate +  and more or less cordate +
Gnaphalium coarctatum +
compound +  and simple +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
spatulate;oblanceolate-obovate +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
Elegant cudweed +
actinomorphic +
flattened +  and oblong +
Ala. +, Ark. +, Calif. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +, Tex. +, Va. +, South America +, also in Mexico +, West Indies +, Europe +, Asia +, Pacific Islands (New Zealand) +  and Australia +
0–150 m +
winged +  and beaked +
dispersed +
Ditches, low roadsides, sidewalk cracks, shaded spots around buildings, other shaded, moist habitats +
papilliform +
interrupted +  and branched +
singly +  and aggregated +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
cylindro-campanulate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
brown-hyaline +
basal +  and cauline +
rarely lanceovate +  and lanceolate +
elliptic-obovate +  and broadly ovate-elliptic +
2-carpellate +
persistent +
Flowering Apr–Jun. +
conic;more or less columnar +
exalbuminous +
Introduced +  and Illustrated +
decumbent-ascending +
white-pannose +
appendaged +  and truncate +
papillate +
Gamochaeta spicata +
Gamochaeta coarctata +
Gamochaeta +
species +
35 cm350 mm <br />0.35 m <br /> (50 cm500 mm <br />0.5 m <br />) +
biennial +  and winter-annual +
15 cm150 mm <br />0.15 m <br /> (35 cm350 mm <br />0.35 m <br />) +
shrub +  and subshrub +