Labiatae(Lamiaceae)  Characteristics: Floral formula, Inflorescence | Mint family

Labiatae(Lamiaceae) Characteristics: Floral formula, Inflorescence | Mint family

Lamiaceae Characteristics Mint family Here we have the overview of this family. The Lamiaceae or Labiatae are a family of flowering plants commonly known as the mint or … The alternate family name Labiatae refers to the fact that the flowers typically have petals fused into an upper lip and a lower lip (labia in Latin). Flower. K(5) Co(5) S2, 2+2 P(2). Sexuality: bisexual. Symmetry: zygomorphic. Inflorescence: raceme or cyme, in whorls or leaf axils … Other features: fleshy nectar disc at ovary base, some have gynodioecy

plant that smells like mint: Sometimes they smell fruity like banana mint (Mentha arvensis ‘Banana’) or sweet and flowery like heliotrope (Mentha arvensis subsp. haplocalyx). … This is used as a mint substitute in the kitchen where the leaves and flowers are used to flavor soups and other dishes, and to make a minty tea.

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Lamiaceae Characteristics Mint family

Distribution:

• Mint family (mint plant) is rather large containing 180 genera & 3500 species of worldwide distribution.

• Mediterranean region-chief center.

• In India-64 species 380 species occurring chiefly in comparatively dry areas and moderate altitudes

• Two chief centres: South India & North western India

Familiar Examples: lamiaceae plants

1. Mentha Piperata(Peppermint) 2. Ocimum sanctum ( Holy basil / Tulsi) 3. Salvia spp. (Sage) 4. Mentha virdis (Poodiana) 5. Mentha spicata (Mentha) Mint plant 6. Lavendula indica (Lavender)

mint plant, Lavendula indica
mint plant, mint flower

Habit:

Mostly Aromatic annual or perrenial herbs,sometimes shrubs (Ocimum sanctum) or rarely small tree

Root:

Branched Tap root

Stem:

herbaceous species quadrangular and hairy

Leaves :

opposite, exstipulate,simple ,blade is entire to multisect as in some species of Salvia

Abdundantly loaded with epidermal glands secreting volatile aromatic oils imparting  characteristic odour.

Inflorescence:

Verticillaster, arranged in raceme, spike or panicle

Lamiaceae Characteristics inflorescence

Flower:

Bracteate, perfect, hermaphrodite, zygomorphic (rarely actinomorphic in mint plant Mentha), pentamerous, hypogynous

Lamiaceae Characteristics flower

Calyx:

Sepals 5, gamosepalous, bilabiate 1/4 or 3/2, valvate , persistent, inferior

Lamiaceae Characteristics Mint family caylx

Corolla:

Petals 5 , gamopetalous and is differentiated into a tube and a limb :tube-straight or bent  ,limb- usually two lipped ,bilipped (4/1;Ocimum or 2/3 Salvia) valvate,or imbricate

Androecium:

stamens 2-4, epipetalous, usually didynamous (rarely monodelphous), filaments usually free, anthers bithecous, dehiscence longitudinal

Lamiaceae Characters androecium

Gynoecium:

Bicarpellary, syncarpous, ovary superior, bilocular ultimately becomes tetralocular

Placentation axile, honey disc present below the ovary, style 1 gynobasic arising from the center of 4 lobed ovaries, Stigma usually bifid

 Mint family gynoecium

Fruit:

Schizocarp of 1-4 nutlets

Lamiaceae Characteristics : Fruit

Floral formula of Labiatae

floral formula of mint family

source

To know about Brassicaceae (Cruciferae)/Mustard Family : Morphological Diversity CLICK HERE 

To know about Brassicaceae (Cruciferae)/Mustard Family : Morphological Diversity CLICK HERE 

Previous year paper of 2018 sem 2

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