- 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.
Shull (American Naturalist, xxxvi., 1902), the mean number of bracts, ray-florets and discflorets, and the standard deviation of each, was determined on four different days, with the following result: TABLE III.
3 is a single spikelet of the same, containing two florets, with the three stamens of one only protruded.
5 is a spikelet of the female inflorescence, consisting of two outer glumes, the lower one ciliated, which enclose two florets - one (a) barren (sometimes fertile), consisting of a flowering glume and pale only, and the other (b) fertile, containing the pistil with elongated style.