Question

Describe rosa sinensis in botanical terms.

Answer 1

Hibiscus rosa-sinensis plant is described as follows:

Habit: Perennial shrub

Root: Tap root system.

Stem: Aerial, erect, cylindrical, woody and branched,

Leaf: Simple, Alternate, petiolate, stipulate, serrate, glabrous, apex acuminate with multicostate reticulate venation.

Inflorescence: Solitary cymose and axillary.

Flower: Pedicel jointed, bracteate, bracteolate, bisexual, large, showy, pentamerous, dichlamydeous, actinomorphic, complete and hypogynous and mucilage is present in floral parts.

Epicalyx: 5 to 8 bracteoles outer to the calyx. They are green and free.

Calyx: Sepals 5, green, gamosepalous showing valvate aestivation and odd sepal are posterior in position.

Corolla: Petals 5, variously coloured, polypetalous but fused at the base and showing twisted aestivation.

Androecium: Numerous stamens, monadelphous, filaments are fused to form a staminal tube around the style. The staminal tube is red. Anthers are monothecous, reniform, yellow, transversely attached to the filament, dehisce transversely and extrorse.

Gynoecium: Ovary superior, pentacarpellary and syncarpous. Ovary pentalocular with many ovules per locule on axile placentation. Style simple, long, slender and passes through the staminal tube. Stigma $5$, capitate and coloured.

Fruit: Mostly abortive.

Floral Formula :

$BrBrl\oplus \acute{o}{K}_{\left(5\right)}{C}_{\left(5\right)}{A}_{\left(\infty \right)}{\underset{–}{G}}_{\left(5\right)}$