Chrysanthemum segetum L.
corn marigold
Glabrous herb. Stems erect, (10)-20-75 cm tall, striate, simple or branched. Basal and lower cauline lvs usually glaucous, very rarely green, obovate to oblong, simple, coarsely dentate to 2-pinnatisect, up to 6 cm long; base cuneate to the smooth or shortly toothed, winged petiole; ultimate segments ovate to subulate, entire or with a few teeth, all in one plane; cauline lvs similar to basal, but smaller near capitula, apetiolate, oblong to narrow-elliptic, often amplexicaul, usually toothed, sometimes entire. Involucral bracts 5-12 mm long; margins and apex membranous; inner bracts with broad apical flap. Capitula solitary or few in corymbs, 3-6-(7) cm diam.; ray florets (9)-12-21; ligules bright to golden yellow; disc florets numerous, yellow. Achenes 1.8-3 mm long, eglandular; achenes of ray florets with 2 lateral wings, 3-5 ribs on inner surface, and 2-3 ribs on outer surface; achenes of disc florets terete, with 10 equal ribs.
N.: Auckland City, near Paeroa (Bay of Plenty), vicinity of Wellington City and coastal Wellington Province; S.: Nelson City, Karamea, Westport and Greymouth (West Coast), vicinity of Christchurch, Timaru.
Europe, N. Africa, Caucasia, W. Syria 1870
Waste places, especially roadsides, pasture, cultivated land, cemeteries.
FL Jan-Dec.
The 2-winged achenes of the ray florets distinguish C. segetum from C. coronarium (Fig. 17).
