86 



METROPOLITAN PARK FLORA. 



LEMNACE.42. duckweed family. 



SPIRODELA, Schleid. 



S. polyrrhiza, Schleid. 



Ponds and pools, floating. M, frequent ; border of Doleful 

 Pond; shore of S. Reservoir; bog, N. side of Bear Hill. 



LEMNA, L. Duckweed. 



L. Valdivlana, Philippi. 



Ponds and nooks in slow streams. B*, this most interest- 

 ing species grows in Monatiquot Stream, near Randolph Ave. 



L. minor, L. 



Ponds and pools, floating. M, common ; bog, N. side of 

 Bear Hill, etc. 



ALISMACEAl. Water-plantain Family. 



ALISMA, L. Water-plantain. 



A. Plantago, L. 



Wet boggy places in soft mud. B * and 8, common : — M, 

 ditch, N. E. of Bear Hill. 



SAG ITT ARIA, L.| Arrowhead. 

 S. latifolia, Willd.J 8. variabilis, Gray, Man. ed. 6, 554, in 

 part. 

 Wet places. B*, Cedar Swamp. 



S. latifolia, Willd., form c.§ S. variabilis, Gray, Man. ed. 

 6, 554, in part. 

 Wet places. B*, Balster Brook ; Monatiquot Stream. 



S. graminea, Michx. 



Shallow water. M *, common round Spot Pond. 



f&. variabilis, Engelm. is frequent in ditches and wet meadows in 

 M, but it has not been studied in the light of J. G. Smith's new 



revision. 



% See 6th Ann. Rep. Missouri Bot. Garden, 34, t. 3. 

 § See 6th Ann. Rep. Missouri Bot. Garden, 38, t. 5. 



