Helicoid Cyme (axes forming a spiral).
In the uniparous cyme a number of floral axes are successively developed one from the other, but the axis of each successive generation, instead of producing a pair of bracts, produces only one.
A characteristic feature is the one-sided (dorsiventral) inflorescence, well illustrated in forget-me-not and other species of Myosotis; the cyme is at first closely coiled, becoming uncoiled as the flowers open.
An inflorescence has the form of a dichotomouslybranched cyme bearing small erect cones; those containing the female flowers attain the size of a fir-cone, and are scarlet in colour.
Biparous Cyme (Dichotomous),including 3-5chotomou3 Cymes (Dichasium, Cymose Umbel, Anthela).
In the helicoid cyme there is also a false axis formed by the basal portion of the separate axes, but the flowers are not placed in a double row, but in a single row, and form a spiral or helix round the false axis.
The uniparous cyme presents two forms, the scorpioid or cicinal and the helicoid or bostrychoid.
In the true raceme, however, we find only a single axis, producing in succession a series of bracts, from which the floral peduncles arise as lateral shoots, and thus each flower is on the same side of the floral axis as the bract in the axil of which it is developed; but in the uniparous cyme the flower of each of these axes, the basal portions of which unite to form the false axis, is situated on the opposite side of the axis to the bract from which it apparently arises (fig.
In the scorpioid cyme the flowers are arranged alternately in a double row along one side of the false axis (fig.
The general name of cyme is applied to the arrangement of a group of flowers in a definite inflorescence.