Conifers.
Redwood is the common name for Sequoia which is a conifer so will have needles.
Besides the visual differences, pine needles remain attached to the branch for several years while maples shed their leaves every fall. A pine needle also has its vascular tissue running down the middle, compared to the vascular network in a maple leaf. Pine needles grow in bunches of 2-6 and maple leaves grow singly on opposite sides of the stem from each other.
They are needles, not leaves. ---An Answer-- Actually needles are leaves and they serve the same purpose. The only real difference in the two are their physical appearance and the the types of trees that produce them. Leafy tress are referred to as "Deciduous" and will lose their leave in the fall of the year when the weather turn cooler. Tress that produce needles are referred to as "Evergreen" trees and they will retain their needle like leaves year round.
Pine trees have needle shaped leaves but Holly leaves are naturally coated with wax.
Conifer trees are needle-leaf trees.
The cross section of the spruce leaf or needle is square in shape. The pine is flat. The spruce needle is attached singly to the branch on a short peg called a sterigma. Pine needles grow in clusters of two to six, depending on the species. See the related link for more information.
a gymnosperm leaf pine needle
Pine needles are considered Leaves because every tree has a leaf, unless the tree is dead or it is Winter time. Also it is considered a leaf because it is also green and it comes off of the tree.
Needles
The trees that have needles instead of flat leaves, have them because Needles reduce evaporation so trees can save water. especially during the winter. The narrow leaves have a thicker skin, a thicker coating of waterproof wax and a needle-like shape reducing the leaf area and the amount of water vapor escaping the leaf.
Needle.
It is a Simple Leaf