1) Rounded 
describing an inflorescence, i.e. head of Asteraceae with central disc florets and marginal female florets which have a reduced inconspicuous slender tubular corolla without a ligule; or an inflorescence with only such reduced female florets. cf. discoid, radiate
circular and flattened
round or oval in shape
• (a.) Discoid.
having a flowering head that contains both filiform and disk flowers, referring to members of the Asteraceae
Disk-shaped. ... (05 Mar 2000) ... 
(dis´ĭ-form) in the shape of a disk.
having a flowering head that contains both filiform and disk flowers, referring to members of the asteraceae
Dis'ci·form adjective Discoid. 
Flattish and circular like a discus.
Type: Term Pronunciation: disk′i-fōrm Definitions: 1. Disc-shaped.
circular and flattened
disciform 1. Flat and rounded in shape; discoid. 2. Having a round or oval shape like a disc.
adjective having a round or oval shape like a disc; `a disciform skin lesion`