Poaceae or Gramineae: Grass Family Characteristics, Floral formula, Floral Diagram And Economic Importance

Poaceae or Gramineae
Poaceae or Gramineae

Diagnostic characters of Poaceae

Kingdom: Plantae.
Subkingdom: Tracheobionta – Vascular plants
Superdivision: Spermatophyta – Seed plants
Division: Magnoliophyta – Flowering plants
Habit: Annual (yearly) or perennial herbs; scarcely tree (bamboos).
Roots: Fibrous roots or adventitious roots.
Stem: Herbaceous (relating to herbs); cylindrical; jointed, hollow at internodes. Sometimes, forms runner or rhizome.
Leaves: Sessile (sessility is a characteristic or type of plant parts that have no stalk) with long sheathing base; alternate; simple; ligulate; parallel venation.
Inflorescence: Panicles of spikelets or Spike of spikelets. Every spikelet is made up of 2-5 (two to five) flowers. It is enclosed by a pair of bracts called glumes.
Panicles of spikelets: The spikelets are arranged on a branched axis-panicle as in oat.
Spike of spikelets: The spikelets form dense clusters in a sessile manner on the main axis as in wheat.
Organism classification: Bambusoideae
Flower: Pedicillate (presence of pedicel); bracteate, two bracts palea, and lemma enclose flower or floret; lemma contain bristle like awns zygomorphic; incomplete; unisexual or hermaphrodite (both sexes are present on the same flower); hypogynous.
Perianth: Represented by two or three scale like lodicules.
Androecium: 3 stamens, sometimes 1,2 or 6; polyandrous; anther versatile.
Gynoecium: Monocarpillary; unilocular; ovary is superior; stigma usually 2; feathery; basal placentation.
Fruits: Caryopsis.
Rank: Family.
Class: Liliopsida – Monocotyledons
Subclass: Commelinidae
Order: Cyperales
Family: Poaceae – Grass family
Seed: Endospermic.

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