A Grammatical Dictionary of Botanical Latin

radiatiformis,-e (adj.B): the the form or shape of a ray or rays; “having outer florets of the capitulum larger than those of the disc but not ligulate” (Stearn); cf. stelliformis,-e (adj.B): star-shaped, stellate;

- capitula [Compositae] radiatiformia dicuntur si heterogama v. homogama corollis florum exteriorum (neutrorum v. rarius femineorum) iis disci majoribus regularibus v. varie irregularibus nec ligulatis, the capitula are called radiatiform if heterogamous or homogamous with the corollae of the outer flowers (neuter or more rarely female) larger than those of the disc, regular or variously irregular, not ligulate.

- corollae in capitulis radiatis radiatiformibusve nunc homochromae, flavae albidae v. rarissime purpureae v. caeruleae, nunc heterochromae disciflavae v. rarius purpureae, radii caeruleae roseae purpureas v. albas, the corollas in capitulis ligulatis flavas caeruleae v. rarius purpureae v. coccineae (B&H), the corollas in radiate or radiatiform capitula sometimes of one color, yellow, white or most rarely purple or blue, sometimes heterochrome [i.e. with different colors], yellow on the disc or more rarely purple, of the rays blue, rose, purple or white.