in Inflorescence by

1 Answer

0 votes
by

DIFFERENCE BETWEEN DISC FLORET AND RAY FLORET

The inflorescence of flowers belonging to Family Asteraceae (Compositaceae) is called a floret. It is seen in Helianthus annus (Sunflower).

Disc floret:

  1. Located in the centre of head, bracteate, actinomorphic. bisexual, tubular, pentamerous.
  2. Calyx: Absent or pappus
  3. Corolla: Five petals, gamopetalous, tubular
  4. Androecium: Five stamens, epipetalous, syngenesious, filaments free.
  5. Gynoecium: Bicarpellary, syncarpous, unilocular, inferior ovary, basal placentation, bifid stigma

Ray floret:

  1. Located towards the periphery of head, bracteate, sessile, zygomorphic, ligulate.
  2. Calyx: Absent or hairy pappus, persistent
  3. Corolla: Five petals, gamopetalous
  4. Androecium: Absent
  5. Gynoecium: Bicarpellary, syncarpous, unilocular, inferior ovary, basal placentation, stigma branched. 
Biology Questions and Answers for Grade 10, Grade 11 and Grade 12 students, Junior and Senior High Schools, Junior Colleges, Undergraduate biology programs and Medical Entrance exams.
...