A GUIDE AND KEY TO AQUATIC PLANTS 



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Scabrous. — Rough. 



Scape. — A naked peduncle rising from the ground (fig. 81). 



Sepal. — A member of the outermost circle of flower parts (fig. 83) . 



Septate. — Possessing partitions or septa. 



Septum. — A partition (pi. septa). 



Serrate. — Toothed like a saw (fig. 84.) 



Serrulate. — Minutely sharp-toothed. 



Sessile. — Without a'stalk of any kind. May refer to leaves, bracts, flowers, or 

 flower clusters. 



Setose. — Bristly. 



Shrub. — A woody plant smaller than a tree and often with several stems. 



Simple. — Not compound. 



Sinus. — A cleft or recess between two lobes (fig. 85) . 



Spathe. — Leaf-like structure more or less enclosing a fleshy inflorescence, par- 

 ticularly in the Araceae (fig. 86). 



Figure 83. 



Figure 84. 



Sinus 

 Figure 85. 



Figure 86. 



Spatulate. — Pertains to shape (fig. 87). 



Spike. — A flower cluster with the flowers sessile along a common more or less 



elongated axis (fig. 88). 

 Spikelet. — A small or secondary spike as in the grasses and sedges (fig. 1 and 2). 

 Spinulose. — Minutely spiny. 



Spur. — A hollow sac-like or tubular extension of some part of a flower (fig. 89). 

 Stamen. — The pollen-bearing organ of the flower (fig. 90) . 



Figure 87. 



Figure 88. 



Figure 89. 



Figure 90. 



