Yellow Toadflax
Linaria vulgaris
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Sometimes called butter and eggs, this plant reaches 1 to 2' tall, reproducing by seed and underground rootstocks. Leaves are pale green, numerous, narrow, pointed at both ends, 2 1/2 inches or more long. Flowers are 1 inch long with a bearded, orange throat and spur-like appendages. Fruit is round, 1/4 inch in diameter, brown, 2-celled, with many seeds. Seeds are dark brown to black, 1/12 inch diameter, flattened with a papery circular wing.
It is found in rangelands, roadsides, waste places, and cultivated fields. An extensive root system makes this plant difficult to control.