Gamochaeta pensylvanica
gamochaeta pensylvanica, Pennsylvania cudweed, Pennsylvania everlasting, Pennsylvania everlasting-cudweed
erect to decumbent or procumbent, loosely arachnose-tomentose.
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.
cupulate-campanulate, 3–3.5 mm, bases sparsely arachnose.
bisexual 3–4; all (or at least bisexual) corollas usually purplish 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 glomerules in continuous or interrupted, spiciform arrays 1–12 cm × 10–15 mm (pressed).
(tan) 0.4–0.5 mm.
= 28.
Gamochaeta pensylvanica
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.)
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