What is rachis and rachilla?

06/11/2020 Off By admin

What is rachis and rachilla?

In context|botany|lang=en terms the difference between rachis and rachilla. is that rachis is (botany) the main shaft of either a compound leaf, head of grain, or fern frond while rachilla is (botany) a rachis of secondary or higher order in leaves and ferns that are compound more than once.

What is difference between spikelet and Rachillae?

is that spikelet is (botany) a small, or secondary spike, especially one of many in the inflorescence of a grass or sedge while rachilla is (botany) the part of a spikelet, in grasses and sedges, that bears the florets.

What is rachilla in flower?

Rachilla, racheola, secondary axis of compound leaf; the axis of a spikelet of a grass or sedge; in Palms, the branch that bears the flowers; (as Rhachilla, as Rhacheola) “a secondary axis in the inflorescence of grasses” (Jackson); “a small or secondary rachis; specifically the axis of a spikelet of a grass or sedge” …

Is petiole and rachis the same?

The term “petiole” refers to the portion of the leaf between the leaf base and the leaf blade. The term “rachis” refers to the extension of the petiole into the leaf blade that the leaflets are attached to in a pinnate leaf palm. The leaves of pinnate leaf palms have both a petiole and a rachis.

Is rachis present in neem?

In pinnately compound leaf, the midrib forms a common axis called rachis. These types of leaves are present in neem plant.

What is the function of the rachis?

In zoology and microbiology In vertebrates, rachis can refer to the series of articulated vertebrae, which encase the spinal cord. In this case the rachis usually forms the supporting axis of the body and is then called the spine or vertebral column. Rachis can also mean the central shaft of pennaceous feathers.

What does rachis mean?

1 : an axial structure: such as. a(1) : the elongated axis of an inflorescence. (2) : an extension of the petiole of a compound leaf that bears the leaflets.

What is the function of lemma?

In mathematics, informal logic and argument mapping, a lemma (plural lemmas or lemmata) is a generally minor, proven proposition which is used as a stepping stone to a larger result. For that reason, it is also known as a “helping theorem” or an “auxiliary theorem”.

What is meant by rachilla?

: a small or secondary rachis specifically : the axis of a spikelet of a grass or sedge.

Does a simple leaf have a rachis?

Envision a bunch of single leaves, all attached by a short stem to a main stem, called a rachis, which in turn is attached to a twig. All leaves, whether simple or compound, will have a bud node at the place of petiole attachment to the twig.

Is rachis present in silk cotton?

(d) Silk cotton has got palmately compound leaf. The rachis is the main axis or midrib which is found in the pinnately compound leaf. It is absent in truly palmately compound leaf.