of development occur in a mixed manner. It is of the following two types. . Thyrsus : It is a ‘ Raceme of cymes ’.
Indefinite central axis bears lateral pedicellate cymes, (simple or compound dichasia). Example: Ocimum . . Verticillaster : Main axis bears two opposite lateral sessile cymes at the axil of the node,each of it produces monochasial scorpioid lateral branches so that flowers Thyrsus Cyathium Hypanthodium Verticillaster Coenanthium Mixed inflorescence Special inflorescence Figure .
: Mixed and special inflorescence . . Flower sex Flower sex refers to the presence or absence of androecium and gynoecium within a flower. .
Perfect or bisexual: If a flower contains both androecium and gynoecium it is called as a perfect flower . . Imperfect or unisexual: When the flower contains only one of the essential whorls is called Imperfect flower . It is of two types: i) Staminate flowers : Flowers with androecium alone.
ii) Pistillate flowers: Flowers with gynoecium alone. Figure . : (a) Bisexual flower Male flower Female flower Figure . : (a) Monoecious Bisexual flower Figure .
: (c) Polygamous Figure . : (c) Female flower Figure . : (b) Male flower Male flower Female flower Figure . : (b) Dioecious .
. Plant sex Plant sex refers to the presence and distribution of flowers with different sexes in an individual plant. . Hermaphroditic : All the flowers of the plant are bisexual.
. Monoecious : Both male and female flowers are present in the same plant Example: Coconut. . Dioecious : Male and Female flowers are present on separate plants.
Example: Papaya, Palmyra. . Polygamous : The condition in which bisexual and unisexual (staminate/pistillate) flowers occur in a same plant is called polygamous . Example: Musa , Mangifera .
. Hypanthodium : Receptacle is a hollow, globose structure consisting of unisexual flowers present on the inner wall of the receptacle. Receptacle is closed leaving a small opening called ostiole which is covered by a series of bracts. Male flowers are present nearer to the ostiole, female and neutral flowers are found in a mixed manner from middle below.
Example: Ficus