Gamochaeta pensylvanica
Gamochaeta antillana
gamochaeta pensylvanica, Pennsylvania cudweed, Pennsylvania everlasting, Pennsylvania everlasting-cudweed
delicate everlasting, narrowleaf everlasting
erect to decumbent or procumbent, loosely arachnose-tomentose.
erect to decumbent-ascending, 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.
basal and cauline, basal usually withering before flowering, blades spatulate to oblanceolate, narrowly lanceolate, linear-oblanceolate, or linear, 2–3(–4) cm × 2–3.5(–5) mm (distal rarely folded along midveins), faces concolor, loosely tomentose.
cupulate-campanulate, 3–3.5 mm, bases sparsely arachnose.
campanulate, 2.5–3 mm, bases sparsely arachnose.
bisexual 3–4; all (or at least bisexual) corollas usually purplish distally.
bisexual 3–5; all corollas usually purple 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 3–4(–5) series, outer ovate-lanceolate, lengths 1/2–2/3 inner, apices (sometimes purplish-tinged) narrowly to broadly acute, inner usually purple (immediately beyond stereome and along proximal margins), oblong, laminae usually purple (at stereome and along proximal margins), apices (whitish, tinged with brown) rounded-obtuse.
in glomerules in continuous or interrupted, spiciform arrays 1–12 cm × 10–15 mm (pressed).
initially in uninterrupted, cylindro-spiciform arrays (1–)3–4(–10) cm × 8–12 mm (pressed), usually becoming glomerulate-interrupted in late flowering (equally leafy-bracted throughout, bracts linear to narrowly lanceolate, smaller distally).
(tan) 0.4–0.5 mm.
(tan) 0.4–0.5 mm.
= 28.
Gamochaeta pensylvanica
Gamochaeta antillana
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 antillana and G. calviceps have been combined in concept and often misidentified as Gamochaeta falcata (Lamarck) Cabrera; the latter name applies to a South American species that has not been recorded from the flora area. Gamochaeta subfalcata, which has been attributed to the United States (e.g., S. E. Freire and L. Iharlegui 1997), almost certainly applies to the same species as G. antillana.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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