Gamochaeta simplicicaulis

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

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• Legacy Map

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.