- Spikelet of Wild Oat, sativa, with two fertile florets, A.
The type form is the Caucasian species roseum of botanists, hardy perennial, with finely cut leaves and large flower heads, having a ray of deep rosecoloured ligulate florets surrounding the yellow centre or disk.
Purpureus, i z ft., with pink flower-heads, having narrow twisted ray-florets; E.
Drummondii, 2 to 3 ft., with the ray-florets reflexed, yellow at the tip and purplishbrown towards the base; R.
Speciosa, I to 2 ft., is a showy composite, of easy culture in good garden soil; it produces large corymbs of flowerheads, with numerous narrow blue ray-florets surrounding the yellow disk.