Floral Formula of Hibiscus

Hibiscus is a genus of flowering plants in the mallow family, Malvaceae. It is a large genus covering hundreds of species native to tropical and subtropical regions with warm temperate features across the world.

Floral Formula

A floral formula is the numeric representation of different floral structures that constitute a flower. It is used to describe a flower using some signs and symbols, in order to designate various floral parts.

The floral formula of Hibiscus rosa sinensis is as follows:

Br Brl ⊕ ⚥ K( 5 ) C( 5 ) A(∞)
Superior ovary ( 5 )

Systematic Position Of Malvaceae

Division: Embryophyta Siphonogama

Sub Division: Angiospermae

Class: Dicotyledonaea

Subclass: Archichlamydeae

Order: Malvales

Family: Malvaceae

Features Of Malvaceae Species

Some Common Plants

Common name

Scientific name

China rose or shoe flower

Hibiscus rosa sinensis

Cotton

Gossypium herbaceum

Lady’s finger

Hibiscus esculentus

Mallow

Malva sylvestris

Hina

Pavonia odorata

Indian tulip

Thespesia populnea

Size And Distribution

The family includes nearly 25 genera and nearly 1500 species widely spread in tropical and temperate regions. In India alone, the Malvaceae family is represented by 22 genera and about 125 species.

Description Of The Family

Habitat: most members are terrestrial mesophytes

Habit: few are annuals (Malva, Althaea) or perennial herbs, some grow very tall (Lavatera). Some are shrubs such as Hibiscus rosa sinensis, Gossypium species or some are small trees such as Kydia, Thespesia populnea.

Root: Typically they possess a tap root system with profuse branching

Stem: aerial, branched, erect, herbaceous, cylindrical, and woody with young portions covered by satellite hairs or trichomes. Typically, the stem displays fibrous nature with much mucilaginous sap.

Leaf: leaves are simple, often lobed palmately and are alternate, petiolate, stipulate, cordate or ovate. The margin usually is entire or serrate, venation is unicostate or multicostate pinnately reticulate. Leaves are generally covered by stellate hair displaying mucilaginous ducts.

Inflorescence: typically cymose, solitary cymes in the leaf axil or raceme.

Flower: Bracteate, bracteolate, actinomorphic, showy, dichlamydeous, complete, pedicellate, heterochlamydeous bisexual, pentamerous and hypogynous, mucilage in floral structures.

Calyx: green, typically 5 sepals, gamosepalous showing valvate aestivation and odd sepal is posterior in position.

Epicalyx: additional calyx like whorl formed by bracteoles on the surface of the calyx. 5-8 bracteoles to the outer calyx, free and green. Number of bracteoles varies in different species.

Corolla: Petals 5, polypetalous bust basally adnate with the staminal column, variously colored, twisted aestivation.

Androecium: Number of stamens, monadelphous, filaments fuse to form a tubular staminal column around gynoecium, anthers reniform, monothecous, extrorse dehiscing transversally or longitudinally

Gynoecium: long, and simple style, slender passing through the staminal tube. Stigma 5, colored and capitate, pentacarpellary syncarpous, ovary superior, ovary pentalocular with several oculi per locule on the axile placentation. Style branches into many stigmata or twice the number, as that of carpels.

Fruit: Abortive mostly. Most members of this family exhibit production of capsules that can be a loculicidal capsule.

Seeds: one or more seeds per locule, exalbuminous with a curved embryo

Pollination: members of this family mainly exhibit entomophilous pollination, where flowers are colored brightly along with extrafloral nectaries.

Salient Features Of The Family

  • Most members of the family exhibit fibrous stem
  • Young stems and leaves will be covered by stellate trichomes
  • Members anatomically show the presence of mucilaginous ducts
  • Flowers characterized by the presence of epicalyx or collection of bracteoles
  • Flowers show polypetalous condition with contorted aestivation
  • Androecium displays numerous stamens, showing monadelphous conditions. Anthers are reniform and are monothecous. The staminal column encloses the gynoecium.
  • The gynoecium is multicarpellary, multilocular, syncarpous, superior ovary with axile placentation
  • The fruit is typically a schizocarp or capsule.

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