Mayweed - Anthemis cotula
Other Names:
Stinking Chamomile, Camomille Maroute, Dog Fennel
Taprooted annual. Stems erect, simple or branched, 10–60 cm. Herbage glabrate to sparsely villous, aromatic. Leaves oblong, 15–50 mm long; ultimate segments linear. Peduncles 2–7 cm long. Involucre 7–11 mm wide, sparsely villous. Rays 10 to 15, white, sterile; ligules 5–10 mm long. Disk corolla 2–3 mm long, glandular. Achenes 1–2 mm long, sparsely glandular; angles glabrous (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).