A GUIDE AND KEY TO AQUATIC PLANTS 7 



Corolla-tube. — Tubular structure formed by united petals (fig. 23). 



Corymb. — A type of flower cluster with a flat top (fig. 24). 



Corymbose. — With a corymb-like inflorescence. 



Crown. — In Hymenocallis a white membrane uniting the filaments. (See fig. 17 



of Group E.) 

 CuNEATE. — Wedge-shaped (fig. 25). 

 Deciduous. — Falling off. 



Decumbent. — Reclining but with the summit of the plant ascending. 

 Decurrent. — Extending or running down on another structure, as a leaf on a 



stem or a tubercle on an achene (fig. 26) . 



Corolla- 

 tube 



Figure 23. 



Figure 24. 



Figure 25. 



Figure 26. 



Deltoid. — 'Shaped like an equilateral triangle or the Greek letter delta (fig. 27). 

 DiCHOTOMOus. — Forking regularly by twos (fig. 28). 



Dissected. — Cut into numerous very fine segments or divisions (fig. 29). 

 Distichous. — Coming off in two ranks (fig. 30). 



Figure 27. 



Figure 28. 



Figure 29. 



Figure 30. 



Divaricate. — Diverging at a wide angle (fig. 31). 



Dorsal. — Surface of an organ away from the central axis of the plant. 



EcHiNATE. — Prickly. 



Elliptic. — Pertains to shape (fig. 32) . 



Emergent. — Rooted to substratum; erect and extending upward out of water 



(fig. 33). 

 Emersed. — Standing above and out of water (fig. 33) . 

 Entire. — Without teeth or other irregularities along the margin (fig. 32). 



Emersed 



Submerged 



Figure 31. 



Figure 32. 



Figure 33. 



Figure 34. 



