formraunkiaer

7/24/2019 Formraunkiaer

http://slidepdf.com/reader/full/formraunkiaer 1/11

Raunkiaer’s classification is asystem published by Christen

Raunkiaer in 1934 to describe

plant life forms.

It is based on the location of thebuds on the plant and the way the

resting bud survives periods of

adverse conditions – like cold or

drought.

It is a useful way to relate plant

and environmental interactions.

Raunkiaer’s classification

• Phanerophyte

• Chamaephyte

• Hemicryptophyte

• Cryptophyte

• Geophyte

• Helophyte

• Hydrophyte

•

Therophyte• Epiphyte

• Aerophyte

Modified Raunkiaer classification

Main menu

Back to vegetativeparts main menu

Back to plantgrowth form menu

Next

http://dept.ca.uky.edu/PLS220/Initialmainpage.pdf

http://dept.ca.uky.edu/PLS220/Vegetativepartsmainpage.pdf


http://dept.ca.uky.edu/PLS220/Formmainpage.pdf










Magnolia

Phanerophytes are the woodyperennials (trees and shrubs).The resting buds are > 0.5 mabove ground.

Phanerophytes have been further

subdivided based on the size ofthe plants into

megaphanerophytes,

mesophanerophytes and

nanophanerophytes.

Additional modification to thisclass recognizes differences indeciduous and evergreen species.

Main menu



Next Back














Grasses, clover and dandelion areall hemicryptophytes.

Hemicryptophytes are herbaceousperennial plants with the restingbud at or near the soil line.

Drabra

Main menu



Next Back














Cryptophytes areperennial plants wherethe resting bud is belowground including thosebelow water.

Cryptophytes can befurther subdivided intogeophytes, helophytesand hydrophytes.

Hyacinth

Iris

Flowering onion

Tulip

Daffodil

Main menu



Next Back














Geophytes have roots or shootsthat are modified as storageorgans.

Geophytes include bulbs, corms,

rhizomes, tubers, tuberousshoots, and tuberous roots.

Cryptophyte

Bulb

Corm

Rhizome Tuber Tuberous stem Tuberous root

Main menu



Next Back














Cattail (Typha )

Helophytes are those plants that growin wet soils. The resting bud is belowground in the wet soil.

Cryptophyte

Marsh marigold (Caltha )

Main menu



Next Back














Hydrophytes grow in water and restingbud overwinters below the surface of thewater often in the lake bed floor.

Cryptophyte

Waterlily (Nymphaea ) Lotus (Nelumbo nucifera )

Main menu



Next Back














Therophytes are thoseplants that survive adverseclimatic conditions as seeds.

These include all of theannual plants.

Main menu



Next Back














An epiphyte is a plant that grows onanother plant, but does not derivewater or nutrients from theassociation.

Epiphytic vascular plants occurmost often in the moist tropics andinclude ferns, aroids, orchids,bromeliads, peperomias, and cactus.

Non-vascular epiphytes includemosses and lichens.

Main menu


Back to plantgrowth form menu Next Back














Spanish moss (Tillandsia usneoides )

Aerophytes are epiphytes, but theyhave no functional roots and absorbmoisture and nutrients through theirleaves.

A good example of this type of plantis Tillandsia .

Tillandsia cyanea )

Main menu


Back to plantgrowth form menu Back











formraunkiaer

Documents