Gamochaeta simplicicaulis

(Willdenow ex Sprengel) Cabrera

Bol. Soc. Argent. Bot. 9: 379. 1961.

Common names: Simple-stem cudweed
Introduced
Basionym: Gnaphalium simplicicaule Willdenow ex Sprengel Syst. Veg. 3: 481. 1826
Synonyms: Gnaphalium purpureum var. simplicicaule (Willdenow ex Sprengel) Klatt
Treatment appears in FNA Volume 19. Treatment on page 434. Mentioned on page 432.

Annuals or biennials, (30–) 50–85 cm; fibrous-rooted. Stems erect or ascending (usually 1, sometimes 2–5), densely and closely white-pannose. Leaves basal and cauline, basal usually withering before flowering, blades oblanceolate to oblanceolate-spatulate, 5–9 cm × 6–18 mm (gradually smaller distally, margins closely undulate, nearly crenulate; distal cauline linear-lanceolate to linear-oblanceolate, apices long-acute; sessile clusters of smaller leaves produced in axils of mid and distal cauline leaves), faces bicolor, abaxial closely white-pannose, adaxial glabrous (shiny). Heads in interrupted, spiciform arrays (8–) 16–30 cm × 10–14 mm (pressed; sometimes with ascending, lateral branches, glomerules usually subtended by ± patent linear bracts longer than the glomerules). Involucres cylindro-campanulate, 3–3.5 mm, bases glabrous. Phyllaries in 4–6 series, outer ovate to oblong, lengths 1/3–1/2 inner, apices acute-acuminate, inner narrowly oblong, laminae brownish to tan (not purplish), apices acuminate-apiculate. Florets: bisexual (2–) 3; all corollas yellowish distally. Cypselae (tan) 0.5–0.6 mm.


Phenology: Flowering (Jun–)Jul–Aug(–Oct).
Habitat: Open sites, sandy soil, roadsides, fields, open woods, dunes
Elevation: 0–10 m

Distribution

V19-714-distribution-map.gif

Introduced; Ala., Fla., Ga., N.C., S.C., South America, naturalized in New Zealand, Australia, Java

Discussion

Gamochaeta simplicicaulis was reported from North America by G. L. Nesom (1999b, 2000b) as an apparently recent adventive.

Selected References

None.

Lower Taxa

None.
... more about "Gamochaeta simplicicaulis"
gray +  and white +
pannose-tomentose +  and tomentose +
subpannose +, tomentose +, arachnose +, glabrous +  and glabrescent +
acuminate-apiculate +
acute-acuminate +
scarious +
mostly ovate +  and lanceovate or linear +
spiciform +  and interrupted +
8 cm80 mm <br />0.08 m <br /> (16 cm160 mm <br />0.16 m <br />) +
indeterminate +  and determinate +
16 cm160 mm <br />0.16 m <br /> (30 cm300 mm <br />0.3 m <br />) +
10mm +  and 14mm +
Guy L. Nesom +
(Willdenow ex Sprengel) Cabrera +
cuneate +  and more or less cordate +
Gnaphalium simplicicaule +
compound +  and simple +
5 cm50 mm <br />0.05 m <br /> (9 cm90 mm <br />0.09 m <br />) +
glabrous +  and white-pannose +
oblanceolate;oblanceolate-spatulate +
6mm;18mm +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
Simple-stem cudweed +
actinomorphic +
flattened +  and oblong +
Ala. +, Fla. +, Ga. +, N.C. +, S.C. +, South America +, naturalized in New Zealand +, Australia +  and Java +
0–10 m +
5 cm50 mm <br />0.05 m <br /> (9 cm90 mm <br />0.09 m <br />) +
glabrous +  and white-pannose +
oblanceolate;oblanceolate-spatulate +
0.6 cm6 mm <br />0.006 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
winged +  and beaked +
dispersed +
Open sites, sandy soil, roadsides, fields, open woods, dunes +
papilliform +
singly +  and aggregated +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
cylindro-campanulate +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
brownish +  and tan +
basal +  and cauline +
rarely lanceovate +  and lanceolate +
ovate +  and oblong +
2-carpellate +
persistent +
Flowering (Jun–)Jul–Aug(–Oct). +
Bol. Soc. Argent. Bot. +
conic;more or less columnar +
exalbuminous +
Introduced +
ascending +  and erect +
appendaged +  and truncate +
papillate +
Gnaphalium purpureum var. simplicicaule +
Gamochaeta simplicicaulis +
Gamochaeta +
species +
30 cm300 mm <br />0.3 m <br /> (50 cm500 mm <br />0.5 m <br />) +
biennial +  and annual +
50 cm500 mm <br />0.5 m <br /> (85 cm850 mm <br />0.85 m <br />) +
shrub +  and subshrub +