What Is Twice Pinnate?

(of a leaf) having leaflets or primary divisions arranged on each side of a common stalk: the pinnate leaves of a palm tree. resembling a feather, as in construction or arrangement; having parts arranged on each side of a common axis: This type of sea cucumber has a mouth surrounded by up to 25 pinnate tentacles.

What is pinnate in biology?

In plant biology, a pinnate is a compound leaf structure with a feather-like formation of leaflets arranged either in pairs or alternating along the main stem. There are both odd and even pinnate leaflets. … In a ‘twice pinnate’, the leaflets are also divided into additional leaflets, like in fern plants.

What is a odd pinnate leaf?

: having leaflets on each side of the petiole and having a single leaflet at the tip of the petiole — see leaf illustration.

What is a palmate?

: resembling a hand with the fingers spread: such as. a : having lobes radiating from a common point a palmate leaf — see leaf illustration. b : having the distal portion broad, flat, and lobed a palmate antler.

What does rachis represent morphologically?

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 pinnate mean?

: resembling a feather especially in having similar parts arranged on opposite sides of an axis like the barbs on the rachis of a feather a pinnate leaf — see leaf illustration.

What is Stipules in leaf?

In botany, a stipule is an outgrowth typically borne on both sides (sometimes on just one side) of the base of a leafstalk (the petiole). … (In some older botanical writing, the term “stipule” was used more generally to refer to any small leaves or leaf-parts, notably prophylls.)

What trees have pinnate leaves?

Trees With Pinnate Leaves

Hickory, ash, walnut, pecan and black locust are all pinnate-leafed trees that can be found in North America.

What is the difference between pinnate and palmate leaves?

The key difference between pinnate and palmate is that the pinnate is the venation pattern in which one main vein extends from the base to the top of the leaf and smaller veins arise from the main vein whereas the palmate is the venation pattern in which several main veins radiate from one point where petiole and leaf …

What are opposite leaves?

In opposite-leaved plants, the leaves are paired at a node and borne opposite to each other. A plant has whorled leaves when there are three or more equally spaced leaves at a node.

What does Pinnately compound mean?

A leaf which is divided into smaller leaflets, those leaflets arranged on each side of the leaf’s central stalk/rachis (axis). A bipinnately compound leaf is twice pinnate; a leaf blade divided into leaflets and having twice-diverged branching. …

What is palmate leaf?

Definitions of palmate leaf. a leaf resembling an open hand; having lobes radiating from a common point. types: pedate leaf. a leaf having the radiating lobes each deeply cleft or divided. type of: compound leaf.

What are the 3 types of leaves?

For tender plants, you will encounter these types of leaf arrangements: basal, rosette, and distichous.

  • 01 of 06. Alternate Leaf Arrangement. …
  • 02 of 06. Opposite Leaf Arrangement. …
  • 03 of 06. Whorled Leaf Arrangement. …
  • 04 of 06. Basal Leaf Arrangement. …
  • 05 of 06. Rosette Leaf Arrangement. …
  • 06 of 06. Distichous Leaf Arrangement.

What is meant by Exstipulate condition?

: having no stipules exstipulate leaves.

What is reticulate venation?

Reticulate venation refers to the arrangement of veins in a leaf where they form a web-like structure. Smaller and more delicate veins emerge from the midrib and spread in the entire leaf. For example, mango and rose leaves; their veins form a network. 3.

What does opinionated mean in English?

: firmly or unduly adhering to one’s own opinion or to preconceived notions … focus groups, which tend to be dominated by the loudest and most opinionated people …— James Surowiecki. Other Words from opinionated Synonyms & Antonyms More Example Sentences Learn More About opinionated.

What is called Venation?

: an arrangement or system of veins (as in the tissue of a leaf or the wing of an insect)

What is a trifoliate leaf?

trifoliated. / (traɪˈfəʊlɪɪt, -ˌeɪt) / having three leaves, leaflike parts, or (of a compound leaf) leaflets.

How is a Pinnately?

In pinnately compound leaf, the number of leaflets are present on a common axis, the rachis, which represents the midrib of the leaf as in neem. In case of a palmately compound leaf, the leaflets are attached at a common point, i.e., at the tip of petiole as in silk cotton.

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.

What is a feather rachis?

The typical feather consists of a central shaft (rachis), with serial paired branches (barbs) forming a flattened, usually curved surface—the vane. … The barbs possess further branches —the barbules—and the barbules of adjacent barbs are attached to one another by hooks, stiffening the vane.