Black-eyed Susan flowerheads are solitary or in loose, open clusters, terminal on the stalk, and grow to 4 inches across. The 8–21 ray flowers are rich yellow or orangish and slender. The central disk is deep brown to purple-brown and hemispherical, becoming egg-shaped with maturity.
Black-eyed Susan commonly grows in pastures, old fields, railroads, roadsides, and open, disturbed areas. This is the most abundant rudbeckia in Missouri and the one that prospers best in disturbed habitats.
The blossoms of blue cardinal flower have the typical lobelia shape, with a 2-parted upper lip and 3-divided lower lip. They can be 1 inch long, and the color is light or dark violet, light or dark blue, or lavender; rarely they are white.
Blue vervain is a tall, slender, erect perennial with branching stems and rough hairs. Its tubular flowers are clustered in many terminal spikes, and can be deep purple, violet, light lavender, or rarely white.
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