_Plicate._ Folded like a fan, 34. _Pod._ A dry dehiscent fruit like that of the pea, 28. _Points of leaves_, 22. _Pollarding trees_, 31. _Pollen._ The dust or fertilizing material contained in the anther, 24. _Polypetalous._ Having a corolla of separate petals, 25. _Pome._ An apple-like fruit with the seeds in horny cells, 27. _Preparation of a collection_, 35. _Pressing plants_, 36. _Prickles._ Sharp, spine-like elevations on the bark, leaf or fruit, 28. _Primary root_, 10. _Pubescent._ Hairy or downy, especially with fine soft hairs or pubescence, 23. _Pulp._ The soft flesh of such fruits as the apple or cherry. _Punctate._ With translucent glands, 23. _Pyramidal._ With sloping sides like a pyramid, but with a circular base; broad-conical. _Raceme._ A flower-cluster with one-flowered stems arranged along the peduncle, 26. _Radial section of wood_, 35. _Radiating ribs._ The ribs of a leaf when several start together at or near the base. A leaf having such ribs is said to be radiately or palmately veined, 20. _Rapier-shaped._ Narrow, pointed, and curved like a sword. _Recurved_ or _reflexed_. Bent backward, 28. _Regular._ Said of a flower which has its enveloping organs alike on all sides, 25. _Repand._ Wavy-margined, 22. _Retuse._ With a slightly notched tip, 22. _Revolute._ Rolled backward, as the edges of many leaves, 22, 34. _Ribbed._ With prominent ribs, often somewhat parallel. _Ribs._ The strong veins of a leaf, 19. _Root_, 9. _Rugous._ Having an irregularly ridged surface, 23. _Samara._ A winged fruit; a key fruit, 28. _Sap-wood_, 13. _Scabrous._ Rough or harsh to the touch, 23. _Scale-shaped_, 21. _Scarious._ Thin, dry, and membranous, 23. _Scattered leaves_, 18. _Secondary roots_, 10. _Section of wood_, 35. _Seedling._ A young plant raised from a seed. _Seeds_, 25. _Sepal._ A division of a calyx, 25. _Serrate._ Having a notched edge, with the teeth pointing forward, 22. _Serration._ A tooth of a serrated edge. _Serrulate._ Finely serrate, 22. _Sessile._ Without stem; sessile leaf, 20; sessile flower, 26. _Sheath._ A tubular envelope. _Shoot._ A branch. _Shrub._ A bush-like plant; one branching from near the base, 11. _Silver grain._ _Medullary rays_, 13, 36. _Simple leaf._ One with but a single blade, 19. _Sinuate._ With a margin strongly wavy, 22. _Sinuation._ One of the waves of a sinuate edge. _Spatulate._ Gradually narrowed downward from a rounded tip. _Spike._ An elongated cluster of flowers with the separate blossoms about sessile. _Spine._ A sharp, rigid outgrowth from the wood of a stem; sometimes applied to sharp points not so deeply seated which should be considered as prickles, 28. _Spinescent_ or _spiny_. Having spines, 22, 23. _Spray._ A collection of small shoots or branches of a plant. _Stamen._ One of the pollen-bearing or fertilizing parts of a flower, 24. _Staminate._ Said of flowers which have stamens but no pistil, 25. _Stellate._ Branching, star-like.