Class
Order
Family
Genus
Classification
Nomenclature
Scientific Name:
Gamochaeta pensylvanica (Willd.) Cabrera, Bol. Soc. Argent. Bot. 9: 375 (1961)
Synonymy:
- ≡ Gnaphalium pensylvanicum Willd., Enum. Pl. [Willdenow] 867 (1809)
Description
Annual, 10–40 cm tall, usually branched only at base; stems 1-few, erect or ascending. Basal lvs mostly 0 at flowering, sometimes present and withered. Lower cauline lvs apetiolate, sparsely tomentose on upper surface, densely tomentose on lower, ± concolorous to somewhat discolorous, plane, usually obovate and long-cuneate, sometimes oblanceolate, obtuse to acute, mucronate, flat or slightly undulate, (10)–20–40–(60) × 3–8–(12) mm; upper cauline lvs similar but smaller, narrower and broader based, sometimes folded. Capitula in dense terminal and axillary clusters; clusters usually forming dense terminal spikes at ends of branches and scattered below. Involucral bracts oblong, obtuse to apiculate, 2.5–3 mm long; stereome green; lamina pale brown; gap and margins clear; outer bracts almost covered by hairs. Achenes minutely papillate, 0.4–0.5 mm long.
[From: Webb et al. (1985) Flora of New Zealand. Volume 4 as Gnaphalium pensylvanicum Willd.]
Biostatus
Exotic
Bibliography
Anderberg, A. A. 1991: Taxonomy and phylogeny of the tribe Gnaphalieae (Asteraceae). Opera Botanica 104: 1–195.
Cabrera, A. L. 1961: Observaciones sobre las Inuleae-Gnaphalineae (Compositae) de America del Sur. Boletín de la Sociedad Argentina de Botánica 9: 359–386.
Drury, D. G. 1971: The American Spicate Cudweeds Adventive to New Zealand: (Gnaphalium Section Gamochaeta - Compositae). New Zealand Journal of Botany 9(1): 157–185. [as Gnaphalium pensylvanicum Willd.]
Willdenow, C.L. von 1809: Enumeratio Plantarum Horti Regii Botanici Berolinensis. Berlin.
