False Dandelions of the Columbia River Gorge
Annual Agoseris: Agoseris heterophylla
1. Orange Agoseris: Agoseris aurantiaca - A perennial, dandelion-like plant with long, narrow leaves with generally entire margins. The flower heads open fully and have flowers which are burnt orange in color.
2. Large-flowered Agoseris, Large-flower Goat-chicory: Agoseris grandiflora (Synonyms: Agoseris grandiflora var. grandiflora, Agoseris grandiflora var. leptophylla, Agoseris laciniata, Agoseris plebeja) - A perennial, dandelion-like plant with all leaves basal, but wider than above and often pinnately lobed. The yellow flower heads are large and often do not open fully. Achenes rounded at the apex with the beak 2-4 times longer than the achene.
3. Annual Agoseris: Agoseris heterophylla var. heterophylla - An annual plant with basal leaves and a single, small, dandelion-like flower head. This is a much smaller plant than the others listed here, being at most 40 cm tall.
4. Spear-leaf Agoseris: Agoseris retrorsa - A perennial, dandelion-like plant that begins with a woolly, straggly haired covering and becomes largely glabrous (at least above) with age. Basal leaves with at least some backward directed lobes. Flower heads narrower than #2 above. Achenes truncate at the apex, with the beak 2-4 times longer than the achene.