According to the continental drift theory

the ancient ecology of the climateand geological vicissitude of the Cathaysian

Australian

South American

Afri-can

North American

Tropical Asian and Indian ancient lands or landmassesthroughout the Mesozoic Period are discussed.Subsequently

the characteristicsof the flowering floras of the ancient lands are analysed

the principal questionsunder discussion is concerning with the total amount

the composition and theantiquitic taxa

such as Magnoliales

Annonales

Ranunculales

Hamamelidales andthe orders of Amentiflorae

etc.And then

the discussed question falls on therelationship between the floras of the ancient lands and the Cathaysian flora.An interest and valuable existing State of affair has shown

that although theAustralian and the Antarctic landmasses was broke away from the mainland ofGongwana at the late Jurassic

but more than 40% of genera (998) are coexistingin Cathaysia and Australia; and in the proper order

a large amount of generaare found between the Cathaysia and India、Tropical Asia、north America、south America and Africa also.Thus it can be seen that the flowering plantswould be originate at the dawn of Triassic or Mesozoic

in other word

it wasoriginated before the breakdown of the unionized Pangaea

Such assessment isproved by the (?)ossils and the survived flowering plants.Following the driftinglandmasses

the flowering plants of all the continents are developed continuously along with the new environment.Lastly

a suggestion is given

that the Cathaysian flora is originated locally

since there are numerous primary taxa survived here which are not found fromother continents

and all the remaining landmasses either covered by the gra-cial or by the sea transgression

or by the droughty climate throughout theMesozoic Period

it is imposible to nurse the flowering plants

only the stabilized Cathaysia will become the cradle of the primary spermatophytes as well asof the flowering plants.