A GUIDE AND KEY TO AQUATIC PLANTS 



9 



Htpogtnum. — In Scleria, a structure underneath and supporting the ovary or 



fruit. 

 Imbricate. — Spirally overlapping (fig. 47). 



Incised. — Cut sharply, irregularly, and more or less deeply (fig. 48). 

 Indehiscent. — Remaining closed at maturity. 

 Inflated. — Dilated or distended. 



Inflorescence. — The flowering part of a plant; a cluster of flowers. 

 Involucre. — A collection of bracts surrounding a flower cluster or head or 



sometimes a solitary flower. 

 Involute. — RoUed inwardly toward the midrib (fig. 49) . 

 Irregular. — Showing inequality in the arrangement of the floral parts; usually 



bilaterally symmetrical. 

 Keeled. — Possessing a central ridge as a boat (fig. 50). 



Figure 47. 



Figure 48. 



Figure 49. 



Figure 50. 



Lacerate. — Irregularly cut as if torn (fig. 51). 



Lamelliform. — Plate-like. 



Lanceolate. — Shaped like a spear-head, broadest near base, tapering to apex, 



and several times as long as broad (fig. 52) . 

 Leaflet. — One of the segments of a compound leaf (fig. 19). 

 Lemma. — The lower of the two bracts enclosing each floret in the grasses (fig. 1). 

 Lenticular. — Lens-shaped, biconvex (fig. 10). 

 LiGULE. — A hairy or scarious projection at the point on the inner surface of a 



grass leaf where the sheath and blade meet (fig. 1) . 

 Linear. — Long and narrow and with parallel sides (fig. 53). 

 LoBED. — With projection or divisions (fig. 54). 



M 



Lobe 



Figure 51. 



Figure 52. 



Figure 53 



Figure 54. 



