Gamochaeta pensylvanica
Gamochaeta simplicicaulis
gamochaeta pensylvanica, Pennsylvania cudweed, Pennsylvania everlasting, Pennsylvania everlasting-cudweed
simple-stem cudweed, simple-stem everlasting
erect to decumbent or procumbent, loosely arachnose-tomentose.
erect or ascending (usually 1, sometimes 2–5), densely and closely white-pannose.
basal and cauline, proximal usually present at flowering, blades spatulate to oblanceolate-obovate, 2–7 cm × 4–16 mm (becoming spatulate to oblanceolate bracts among proximal heads, surpassing glomerules, bases narrowed to petiolar regions, margins sinuate, apices often apiculate), faces concolor or weakly bicolor, loosely tomentose.
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).
cupulate-campanulate, 3–3.5 mm, bases sparsely arachnose.
cylindro-campanulate, 3–3.5 mm, bases glabrous.
bisexual 3–4; all (or at least bisexual) corollas usually purplish distally.
bisexual (2–)3; all corollas yellowish distally.
in 3–4 series, outer ovate-triangular, lengths 1/2–2/3 inner, apices attenuate-apiculate, inner oblong, laminae often purple-tinged (at stereome), apices (transparent, sometimes golden) acute to obtuse.
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.
in glomerules in continuous or interrupted, spiciform arrays 1–12 cm × 10–15 mm (pressed).
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).
(tan) 0.4–0.5 mm.
(tan) 0.5–0.6 mm.
= 28.
Gamochaeta pensylvanica
Gamochaeta simplicicaulis
Gamochaeta pensylvanica is recognized by its obovate-spatulate, loosely tomentose and concolor or weakly bicolor basal and proximal cauline leaves, and similarly shaped spreading bracts among the heads. Occasional plants appear intermediate between G. pensylvanica and G. antillana. The latter differs in its more erect stems, linear to oblanceolate basal and proximal cauline leaves, and more nearly continuous arrays of heads with linear to narrowly oblanceolate bracts.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Gamochaeta simplicicaulis was reported from North America by G. L. Nesom (1999b, 2000b) as an apparently recent adventive.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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