MONOCOTYLEDONOUS OR ENDOGENOUS PLANTS. 563 



PONTEDERIA, L. AVampee; Pickeuel-weed. 



Pcriantli funnel-sbaped, 2-li})petl, with the upper lip 

 3-lobed, the lower 3-parted, the curved tube fleshy and 

 coiled iu fruit; stamens G, unequally inserted, the three 

 lower ones exserted, the three upper short and often im- 

 perfect; anthers oval, blue ; ovary 3-celled, two of the cells 

 empty, the other with a single suspended ovule ; style 

 slender; capsule (utricle) 1-seeded; rliizoma thick and 

 creeping. Stem erect, bearing above the middle a single 

 short-petioled leaf, and at the summit a hairy spike of 

 blue flowers, from a 1-leaved spathe ; radical leaves long- 

 petioled, sheathing. 



P. CORDATA, L. Stem and terete iietxoles erect (2°-3° 

 high) ; leaves (3'-8' long) varying from round-cordate to 

 lance-oblong, obtuse, finely nerved; sinlce dense, cylindri- 

 cal (2-4' long), the peduncle inclosed in the convolute 

 spathe; upper lobe of the hair j jjei'ianth spotted Avith yel- 

 low, the tube 6-ribbed. (P. lancifolia, MuhL, and P. an- 

 gustifolia, Pursh, are narrow-leaved forms.) Miry mar- 

 gins of ponds and rivers. July-September. 



SCHOLLERA, Schreb. 



Perianth salver-form, nearly equally 6-lobed, the tube 

 elongated and filiform ; stamens 3, nearly equal ] filaments 

 subulate ; anther'i sagittate-oblong, yellow ; style long and 

 slender ; capsule oblong, 1-celled, loculicidally 3-valved, 

 with three parietal placenta many-seeded. — A small 

 aquatic herh, Avith slender branching stems, linear sessile 

 leaves, and a small terminal y^Wow floiver. 



S. GRAMINEA, Willd. /S'/em Submerged, forking ; leaves 

 thin, pellucid ; fioivers expanding at the surface of the 

 water; spathe convolute; lohes of the perianth linear, 

 spreading. (Leptanthus, Mich.) In flowing w^ater. July 



