If four glumes are present, then the external pair of them corresponds to the involucrum or spatha, the internal to the calyx.
It corresponds to the floral involucrum or bracteal scales.
As the root puts forth numerous branches, so the involucrum or spatha frequently incloses many blossoms that constitute the thyrsus or synthetic form of inflorescence.
The seeds are no longer therefore distributed in the present class throughout the whole trunk, but developed in a special involucrum or theca, which corresponds to the puff-ball, or to the pileus of the higher organized fungi.
The involucrum corresponds to the scale-leaves or bracts, and is therefore as a rule polypetalous.
It belongs to that section of its numerous genus having an involucrum of stalked leaflets.
The leaves are triternate, divisions deeply cut and acute; the leaves of the involucrum are stalked, trifid, and deeply cut.
Said involucrum is composed of numerous small leaves, a distinguishing trait from its nearest relative genus Rudbeckia.
A little later theinvolucrum becomes developed, and is no unimportant feature.
Lastly, the genus Althaea, the Marsh Mallow, has the involucrum cleft into six or nine divisions, and the carpels united into a globular capsule.
The involucrum is composed of three broad, heart-shaped leaflets, which remain on till the seed is ripe.
As the seeds ripen, the involucrum falls off, but the large loose-looking calyx remains on.
The calyx consists of five sepals, below which is an involucrum of six or seven leaflets, which have the appearance of a second calyx.
In the genus Malva, the involucrum consists of three leaflets, which in the common Mallow (Malva sylvestris) are oblong.
They have also always an involucrum below the calyx, but thisinvolucrum differs in the different genera.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "involucrum" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: blade; bract; flag; frond; leaf; leaflet; needle; petal; pile; spear; spire
