Sunday, 2 June 2019

Plant Description of Brassicaceae

Plant Description of Brassicaceae


Brassica Campestris  Linn. Var.  Sarson.  Prain
Stem.  Herbaceous,  aerial, erect, cylindrical, branched, solid, smooth and green.
Leaf. Cauline and Ramal, alternate, exstipulate, simple, sessile, lower leaves are lyrate with deeply cut margins, acute, glabrous, unicostate, reticulate.
Inflorescence. Racemose raceme.
Flower. Ebracteate, pedicellate, complete, actinomorphic, hermaphrodite, tetramerous, hypogynous, cyclic and yellow.
Calyx. Sepals 4 in two whorls of 2 each, polysepalous, slightly petaloid.
Corolla. Petals  4,  polypetalous, cruciform, each petal is distinguished into a claw and a limb, valvate.
Androecium. Stamens 6 in two whorls (2  +  4), polyandrous, tetradynamous, 4 inner long  and  2  outer  short,
dithecous, basifixed and introrse, glands are present at the base of 4  longer stamens.
Gynoecium. Bicarpellary, syncarpous, ovary superior, unilocular but becomes bilocular later on due to the development of a false septum (replum), ovules many in each locule, placentation parietal, style short and stigma is bilobed.
Fruit.  Siliqua.
Floral formula. 

Classification  and  Identification
Class. Dicotyledonae.
1.  Venation reticulate.
2.  Flowers pentamerous.
Sub-Class.  Polypetalae
1.  Petals free.
Series.  Thalamifldrae
1.  Flowers hypogynous and ovary superior.
Order.  Parletales
1.  Carpels united to form unilocular ovary with parietal placentation.
Family.  Cruciferae
1.  Herbs with alternate exstipulate leaves.
2.  Corolla cruciform.
3. Stamens are tetradynamous.
4. Ovary bicarpellary, syncarpous, unilocular but becomes bilocular due to the development of a false septum; fruit siliqua.

1. English name. Indian  Colza,  Yellow Mustard.
2.  Vernacular name. Sarson.
3. Economic importance.  The seeds yield an oil used for cooking and anointing the body. The oil cake is a good cattle feed. The tender leaves and shoots are used as a vegetable.

Coronopus Didymus  (Linn.) Sm.
Habit. Herb.
Root. Tap branched.
Stem. Herbaceous, aerial, weak, trailing, diffuse, cylindrical, branched, branches form rosettes, solid,
glabrous and green.
Leaf. Some are radical which are larger in size but others are cauline and Ramal, alternate, exstipulate, compound, unipinnate and imparipinnate, petiolate, petiole base hairy, pinnae have cut margins, glabrous, unicostate, reticulate.
Inflorescence. Racemose raceme.
Flower. Ebracteate, pedicellate, complete, actinomorphic, hermaphrodite tetramerous, hypogynous and cyclic.
Calyx. Sepals  4,  polysepalous, valvate, margins membranous  and  green.
Corolla. Petals absent.
Androecium. Stamens  2,  anterior-posterior in position, polyandrous, filaments long, tapering at the apex  and broad at the base, dithecous, basifixed, introrse.
Gynoecium. Bicarpellary, syncarpous, ovary superior, unilocular when young but later becomes bilocular due to the development of a complete but false septum.  In very young cases placentation is parietal but in old cases, it is axile due to the false septum with only one ovule in each locule, style reduced and stigma disc-shaped.
Fruit. Silicula.
Floral formula.

Classification and identification.
Class.  Dicotyledonae
1.  Venation reticulate.
2.  Flowers pentamerous.
Sub-Class.  Polypetalae
1.  Petals free.
Series.  Thalamiflorae
1.  Flowers hypogynous and ovary superior.
Order.  Parietales
1.  Carpels united to form unilocular ovary with parietal placentation.
Family.  Cruciferae
1.  Herbs with alternate exstipulate leaves.
2.  Corolla cruciform.
3. Stamens are tetradynamous.
4.  Ovary bicarpellary, Syncarpous, unilocular but becomes bilocular due to the development of a false septum, fruit silicula.

1.  English name.  Lesser wart-cress.

Iberis amara  Linn.
Stem. Herbaceous, aerial, erect, angular, branched, solid, rough and green.
Leaf. Cauline and ramal, alternate, at some places they seem to be opposite, exstipulate, simple, sessile, lanceolate, margin slightly dissected in the upper portion of the leaf, acute, glabrous, unicostate, reticulate.
Inflorescence. Racemose corymb.
Flower. Ebracteate, pedicellate, complete, zygomorphic,-hermaphrodite, tetramerous, hypogynous and cyclic.
Calyx. Sepals 4 in two whorls of 2 each, polysepalous, imbricate, petaloid, boat-shaped.
Corolla. Petals  4,  polypetalous, valvate, cruciform, 2 anterior petals are large, each petal is distinguished into a claw and a limb.
Androecium. Stamens 6 arranged in 2 whorls (2  +  4), polyandrous, tetradynamous - two outer and lateral are short and 4 anterior-posterior are long; dithecous, dorsifixed, introrse.
Gynoecium. Bicarpellary, syncarpous, ovary superior, unilocular when young but later becomes bilocular due to the development of a complete but false septum, placentation parietal, style long, stigma capitate.
Fruit. Silicula.
Floral formula. 

Classification and identification.
Class.  Dicotyledonae
1. Venation reticulate.
2.  Flowers pentamerous.
Sub-Class.  Polypetalae
1.  Petals free.
Series.  Thaiamiflo1YllJ
1. Flowers hypogynous and ovary superior.
Order.  Parietales
1.  Carpels united to form unilocular ovary with parietal placentation.
Family.  Cruciferae
1.  Herbs with alternate exstipulate leaves.
2.  Corolla cruciform.
3.  Stamens are tetradynamous.
4.  Ovary bicarpellary, syncarpous, unilocular but later becomes bilocular due to the development of a false septum, fruit silicula.
1. English name.  Rocket Candytuft.
2.  Economic importance. Cultivated as an ornamental.



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