Gamochaeta pensylvanica
Gamochaeta calviceps
gamochaeta pensylvanica, Pennsylvania cudweed, Pennsylvania everlasting, Pennsylvania everlasting-cudweed
narrowleaf purple everlasting
erect to decumbent or procumbent, loosely arachnose-tomentose.
erect, ascending (usually branched ± throughout), subpannose (hairs silver-gray, longitudinally arranged).
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.
mostly cauline, basal usually withering before flowering, blades spatulate to oblanceolate, mostly 2–6 cm × 2–9 mm (becoming linear-oblanceolate to linear distally, commonly folded along midveins), faces concolor or weakly bicolor, subpannose (hairs closely appressed).
cupulate-campanulate, 3–3.5 mm, bases sparsely arachnose.
campanulate, 3–3.5 mm, bases usually glabrous or glabrate.
bisexual 3–4; all (or at least bisexual) corollas usually purplish distally.
bisexual 2–4; all corollas 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 5–7 series, outer ovate-triangular, lengths 1/3–1/2 inner, apices acute-acuminate (involute and spreading to recurved), inner oblong, laminae slightly brown (not purple), apices obtuse-apiculate.
in glomerules in continuous or interrupted, spiciform arrays 1–12 cm × 10–15 mm (pressed).
initially in continuous or interrupted, spiciform arrays, 2–4 cm × 8–12 mm (pressed), later in paniculiform arrays 4–18 cm (main axes usually visible between heads, peduncles usually evident).
(tan) 0.4–0.5 mm.
(tan) 0.4–0.5 mm.
= 28.
Gamochaeta pensylvanica
Gamochaeta calviceps
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 calviceps is recognized by its subpannose cauline and foliar indument (perhaps intermediate between the looser tomentum of G. antillana and the tight, pannose covering of G. argyrinea) and the contrast of its spatulate proximal leaves with the much narrower cauline ones, glabrous or glabrescent involucres, and phyllaries in 5–7 series, lacking purple color, the outer and mid with acute-acuminate apices commonly becoming subulate (by inrolled margins). The distal cauline leaves usually are folded along the midveins (at least when pressed). The relatively late flowering also is distinctive. Plants on the Atlantic coastal plain usually produce 2–3 bisexual florets per head, those on the Gulf coast 3–4.
Heads of older plants are borne in paniculiform arrays resulting from development of lateral branches, the heads usually on evident peduncles and with very little tomentum at the base of the outer phyllaries, thus appearing discrete. In early-season plants, lateral branches may not have formed or lengthened and the arrays of heads may appear continuous-cylindric at stem apices; in such plants, the species can usually still be recognized by the relatively numerous, relatively shorter, axillary shoots along the main stems.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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