Gamochaeta pensylvanica
Gamochaeta sphacelata
gamochaeta pensylvanica, Pennsylvania cudweed, Pennsylvania everlasting, Pennsylvania everlasting-cudweed
owl's crown
erect to decumbent or procumbent, loosely arachnose-tomentose.
erect to ascending, densely gray-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 linear to narrowly oblanceolate (often folded along midveins), 1–4 cm × 1–3(–5) mm (distally becoming ± patent, arcuate bracts surpassing the heads), faces concolor or weakly bicolor, pannose-tomentose (± equally grayish to whitish, basal cells of hairs on adaxial faces persistent, expanded, glassy).
cupulate-campanulate, 3–3.5 mm, bases sparsely arachnose.
cylindro-campanulate, 3.5–4(–5) mm, sparsely arachnose.
bisexual 3–4; all (or at least bisexual) corollas usually purplish distally.
bisexual 3–5; all 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 (3–)4–5 series, outer triangular, lengths 1/3–1/2 inner, apices (brown) acute-acuminate (usually inrolled and spreading or recurved), inner triangular-lanceolate, laminae purplish (in bud) to whitish or silvery (in fruit), apices (usually striate) acute (not apiculate).
in glomerules in continuous or interrupted, spiciform arrays 1–12 cm × 10–15 mm (pressed).
in terminal glomerules 1 cm or in interrupted, spiciform arrays 2–14 cm × 10–12(–14) mm (pressed; glomerules sometimes axillary).
(tan) 0.4–0.5 mm.
(tan) 0.5–0.6 mm.
= 28.
Gamochaeta pensylvanica
Gamochaeta sphacelata
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 sphacelata is recognized by its linear to narrowly oblanceolate, concolor leaves, interrupted, spiciform arrays of heads in compact axillary glomerules or on lateral branches, glomerules subtended by ± patent, arcuate bracts, dark brown involucres, and acute-acuminate, recurving tips of outer and mid phyllaries. Roots are typically lignescent taproots. As in G. purpurea, the basal cells of each hair on adaxial leaf faces are persistent, expanded, and glassy.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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