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Morphology and Histology of japa - Hibiscus rosa-sinensis Linn.

japa :

Hibiscus rosa-sinensis


Morphology:

Hibiscus rosa-sinensis is native to Tropical Asia. It is an evergreen woody, glabrous, showy shrub 5- 8 feet in height.

Leaves: Leaves are simple ovate or ovate- lanceolate. Leaves are entire at the base and coarsely toothed at the apex. Taste is mucilaginous.

Flowers: Flowers are pedicillate, actinomorphic, pentamerous and complete. Corolla consists of 5 petals, red in color and about 3 inches in diameter.


Roots: Cylindrical of 5-15 cm length and 2 cm in diameter, off white in color light brown transverse lenticies. Its fracture is fibrous. Roots taste sweet and mucilaginous.



Histology:

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 is 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. 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.

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