Thursday, 11 June 2015

Iris germanica, leaf of a monocotyledon plant, cross section

The leaf of the Iris Germanica is unifacial in its upper part, this means that both sides are equal. Its lower part however becomes increasingly bifacial; the opposite sides resemble each other increasingly less. Both sides of the leaf have the same number of stomata, being an indicator for unifacial leaves. A "cap" of sclerenchyma fibers closes in to the phloem vessels at the outside. It protects and gives the leave tensile and tear strength at the same time. Vascular bundles are leaf veins. The Iris germanica can be recognized as a monocot by their parallel veined leaves.

Iris is a genus of 260–300 species of flowering plants with showy flowers. It takes its name from the Greek word for a
rainbow, referring to the wide variety of flower colours found among the many species. As well as being the scientific name, iris is also very widely used as a common name for all Iris species, as well as some belonging to other closely related genera. A common name for some species is 'flags', while the plants of the subgenus Scorpiris are widely known as 'junos', particularly in horticulture. It is a popular garden flower.

Iris leaves are inwardly folded along the edges serving as sheaths helping to keep the leaves firmly together. Most plants belonging to the Iris genus usually produce flat, lance-like leaves.

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