Question

Give two important species of sphenopsida

Answer 1

Sphenopsida (horsetails) is the Class of the Pteridophytina that first appeared in the Devonian  

Explanation:

• They have joint stems with their leaves and branches that born at the stems
• These play a major role in the formation of coal-swamp vegetation
• They help to provide shade to the other small plants and herbs and save them from harsh conditions

Learn more about angiosperms here:

What are angiosperms?? ​

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Answer 2

Important species of Sphenopsida are Sphenophyllum,Equisetum.

Explanation:

• Sphenopsida belongs to class pterydophytina that appears during devonian period but more diversity occur during carboniferous period.

• Their body is divided into nodes and inter nodes  which is a character of higher vascular plant.

• The leaves are microphyllus which originates from whorls.

• They contain joint stem with leaves in the whorls.

• Branches developed at the nodes.

• The internode part is vertically ridged.

• Spore formation takes place in the sporangia that are arranged in ring like manner.