Gamochaeta pensylvanica
Gamochaeta ustulata
gamochaeta pensylvanica, Pennsylvania cudweed, Pennsylvania everlasting, Pennsylvania everlasting-cudweed
featherweed, Pacific cudweed, purple cudweed, spoon-leaf cudweed
erect to decumbent or procumbent, loosely arachnose-tomentose.
erect to ascending (commonly decumbent-ascending and rhizome like), densely 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 spatulate to oblanceolate, 2–5 cm × 6–12(–35) mm (little smaller distally), faces bicolor, abaxial white-pannose, adaxial sparsely to densely arachnose-tomentose.
cupulate-campanulate, 3–3.5 mm, bases sparsely arachnose.
campanulo-urceolate, 4.5–5 mm, bases sparsely arachnose.
bisexual 3–4; all (or at least bisexual) corollas usually purplish distally.
bisexual (3–)4–6; all corollas usually yellowish, sometimes 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 4–6 series, outer (brown or greenish brown) broadly ovate-triangular, lengths ca. 1/2 inner, apices acute to acute-acuminate (mid phyllaries ± keeled near apices), inner oblong, laminae usually dark brown, sometimes purplish (at stereome-lamina junction), apices rounded to obtuse, apiculate.
in glomerules in continuous or interrupted, spiciform arrays 1–12 cm × 10–15 mm (pressed).
in usually continuous, rarely interrupted (proximally), cylindric arrays 1–6(–8+) cm × 12–18 mm (pressed).
(tan) 0.4–0.5 mm.
(tan to brownish) 0.7–0.8 mm.
= 28.
Gamochaeta pensylvanica
Gamochaeta ustulata
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 ustulata usually has been included in G. purpurea; it differs mostly in its longer duration, thicker and shorter stems, larger, more compact arrays of larger, brown heads, and aspects of phyllary morphology.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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