A. Types of racemose inflorescence.
(1) Simple Raceme : Peduncle is unbranched, grows indefinitely
on its numerous pedicillate, bracteate flowers are arranged in accropetal manner.
Ex: Crotalaria .
(2) Compound Raceme : Peduncle is branched. Each branch resembles a simple raceme. Ex: Mangifera. It is also called Panicle.
(3) Simple Corymb : Peduncle is unbranched and grows - indefinitely. On it numerous pedicillate, bracteate flowers are arranged in accropetal manner. The lower flowers have long pedicels and upper flowers have shorter pedicels. Thus all the flowers are brought more or less to the same height.
Eg : Cassla.
(4) Compound Corymb: Peduncle.is branched and each branch is produced into a simple corymb. Eg: Cauliflower.
(5) Simple Umbel : The peduncle is condensed and unbranched. Many bracteate and pedicellaté flowers arise at the tip. At the base of flowers, all the bracts form a whorl called involucre . Ex Onion.
(6) Compound Umbel : Peduncle is branched. Each branch produces a simple umbalat its tip. Ex: Carrot
(7) Simple Spike : Peduncle is unbranched. On it bracteate, sessile flowers are arranged, accropetally. Ex: Achyranthes.
(8) Compound Spike: Peduncle is branched. Each branch is similar to simple spike: Ex : Grass (Poaceae family).
(9) Simple Spadix: Peduncle is unbranched. On it sessile, unisexual and neuter flowers are arranged in acropetal succession. It is protected by modified bract called .Spathe.. Ex : Colocasia.
(10) Compound Spadix : Peduncle is branched. Each branch is similar to simple spadix .Ex : Musa , Cocos.
(11) Head inflorescence : Unisexual and bisexual sessile flowers are arranged centripetally on a condensed peduncle. Such an arrangement of flowers is called Head inflorescence.
Ex. Tridax, Sunflower (Asteraceae family).
