(a) Cycads : Cycads belong to group gymnosperms with an unbranched stem having a crown of palmlike leaves. It had terminal cones, e.g., Cycas.
(b) Conifers : They belong to gymnosperms. They have a monopodial branching, resin canals, small or pointed leaves frequently borne on dwarf shoots and unisexual cones never present on the tips of main branches, e.g., Pinus (Pines), Cedrus (Cedar), Picea (Spruce), Abies (Fir), ]uniperus (Juniper), Thuja, Cupressus etc. Pollen grains of Pinus form "sulphur shower".