What does Distichus mean?

(dĭs′tĭ-kəs) adj. Botany. Arranged in two vertical rows on opposite sides of an axis: distichous leaves. [From Latin distichus, having two rows, from Greek distikhos; see distich.]

What is leaf sheath?

Leaf-sheath meaning (botany) A structure at the base of a leaf’s petiole that partly surrounds or protect the stem or another organ that it subtends. noun. 1.

What is exstipulate leaf in plants?

Stipules are considered part of the anatomy of the leaf of a typical flowering plant, although in many species they may be inconspicuous —or sometimes entirely absent, and the leaf is then termed exstipulate. The word stipule was coined by Linnaeus from Latin stipula, straw, stalk.

What is meant by Petiolate leaf?

A petiolate plant is one that has leafstalks or petioles that attach the leaves to the stem. This is in contrast to sessile plants lacking petioles; hence, their leaves are attached directly to the stem.

What are sheath cells?

A layer of cells in plant leaves and stems that forms a sheath surrounding the vascular bundles. It also means that the products of photosynthesis can be quickly transferred from the bundle sheath to the adjacent phloem tissue for transport to other parts of the plant.

What plants generally have Microphylls?

The clubmosses and horsetails have microphylls, as in all extant species there is only a single vascular trace in each leaf. These leaves are narrow because the width of the blade is limited by the distance water can efficiently diffuse cell-to-cell from the central vascular strand to the margin of the leaf.

What are sessile plants?

In botany, sessility (meaning “sitting”, used in the sense of “resting on the surface”) is a characteristic of plant parts (such as flowers and leaves) that have no stalk. A sessile flower is one that lacks a pedicel (flower stalk). A flower that is not sessile is pedicellate.

Why plants are sessile?

Plants are sessile organisms that are permanently restricted to their site of germination. To compensate for their lack of mobility, plants evolved unique mechanisms enabling them to rapidly react to ever changing environmental conditions and flexibly adapt their postembryonic developmental program.

What is stipulate and exstipulate?

(i) Leaves with stipules are called stipulate leaves. (ii) Leaves without stipules are called exstipulate or estipulate leaves.