Gamochaeta purpurea
Gamochaeta antillana
purple everlasting-cudweed, spoon-leaf cudweed, spoon-leaf purple everlasting
delicate everlasting, narrowleaf everlasting
erect to decumbent-ascending, densely but loosely pannose or pannose-tomentose.
erect to decumbent-ascending, loosely arachnose-tomentose.
basal and cauline, basal and proximal cauline usually withering before flowering;
blades oblanceolate to spatulate, 1–6 cm × 5–14 mm (distal similar, at least among proximal heads, margins sometimes sinuate), faces usually bicolor, abaxial closely white-pannose, adaxial usually sparsely arachnose (basal cells of hairs persistent, expanded, glassy), sometimes glabrescent.
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.
turbinate-cylindric, 4–4.5 mm, bases sparsely arachnose.
campanulate, 2.5–3 mm, bases sparsely arachnose.
bisexual 3–4; all corollas usually purplish distally.
bisexual 3–5; all corollas usually purple distally.
in 4–5 series, outer ovate-triangular, lengths 1/3–2/3 inner, apices acute-acuminate, inner triangular-lanceolate (usually striate), laminae purplish (in bud) to whitish or silvery (in fruit), apices acute (not apiculate).
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.
initially in continuous spiciform arrays 1–4(–5) cm × (5–)10–15 mm, later interrupted (glomerules widely separated, bracteate, the proximal often on relatively long peduncles).
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) 0.6–0.7 mm.
(tan) 0.4–0.5 mm.
= 14, 28.
Gamochaeta purpurea
Gamochaeta antillana
Gamochaeta purpurea apparently is native to North America and adventive elsewhere.
Basal cells of hairs on adaxial faces of leaves are expanded and glassy (versus hairs filiform to bases in most other species) and are diagnostic for Gamochaeta purpurea. From Maryland northward, plants of G. purpurea produce relatively small basal rosettes and relatively shallow fibrous roots or a filiform taproot; southward and southwestward, the basal rosettes often are larger and the fibrous roots are denser.
Gamochaeta purpurea apparently occurs widely through the world as a weed; it is fairly clearly native to eastern North America, where it is the least weedy of the gamochaetas. Plants of G. purpurea in southern Arizona along perennial streams at the base of the Santa Catalina Mountains were first collected in 1903 (G. L. Nesom 2004) and were, perhaps, accidentally established through visitation; the same sites are heavily infested by other, more aggressive, nonnative species. Collections of G. purpurea also have been made at higher elevations in the Santa Catalina, Rincon, and Chiricahua mountains, where the species is less likely to have been introduced by human activity. It also seems unlikely that plants in scattered Mexican localities were introduced there by human activity.
(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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