210 GLOSSARY OP TERMS AND INDEX TO PART I 



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. 



Rcpand. Wavy-margined, 22. 



Refuse. With a slightly notched tip, 22. 



Revolute. Boiled 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 for- 

 ward, 22. 



Serration. A tooth of a serrated edge. 

 Serrulate. Finely serrate, 22. 

 Sessile. Without stem ; sessile leaf, 20 ; sessile flower, 26. 



