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Mimosa: a plant of a genus that includes the sensitive plant.

Morphology: the branch of biology that deals with the form of living organisms, and with relationships between their structures. from Greek morphē ‘form’ + -logy ‘denoting a subject of study’.

Compound leaves: is a leaf whose leaflets are attached to the middle vein but have their own stalks.

Pinnate leaves: a leaf resembling a feather; having the leaflets on each side of a common axis.

Rachis: the midrib of a compound leaf.

Leaflet: each of the leaflike structures that together make up a compound leaf.

Pulvinus: an enlarged section at the base of a leaf stalk in some plants, which is subject to changes of rigidity leading to movements of the leaf or leaflet.

Droop: cause to bend or hang downwards.