No. 50.] 
181 
Orontium, L. Golden Club, Floating Arum . 
aquaticum, L. In shallow water. May. 
AcoRUs, L. Calamus^ Siveet Flag . 
calamus, L. Wet meadows and swamps. May- June. 
Order TYPHACEJG. The Cat-tail Tribe. 
Typha, L. Cat-tail, Reed Mace . 
latifolia, L. Borders of swamps and rivers . June-July . 
angustifolia, L. With the preceding . 
Sparganium, L. Burr Reed . 
ramosum, L. In shallow ponds and streams . June . 
simplex, Smith. S. americanum, Nutt. Borders of streams. July. 
Order FLUVIALES. 
Najas, L. 
canadensis, M2c^^. Ponds and slow-flowing water. July. 
Zostera, L. Grasswrack. 
marina, L. Seashore and salt-water bays . 
Zannighellia, Ij, Triple-headed Pondweed . 
palustris, L. Z. intermedia, Torr. Ditches and shallow ponds ; 
most common in brackish water . July . 
RuppiA, L. 
maritima, L. Salt-water ditches . July . 
PoTAMOGETON, L. Pondwced . 
natans, L. Ponds and slow-flowing water. July, 
heterophyllus, Schreb.? P. fluitans of American botanists. Ponds, 
&c. 
diversifolius, jBtzr^. Flowing water . July- August, 
perfoliatus, X. Flowing water . July. 
praslongus, Wulff. P. luceus of American botanists. Slow-flowing 
deep water. July- August. 
compressus, L, P. zosteragfolius, Schum.? Flowing water. July. 
gramineus, Michx. P. pauciflorus, Pursh. Small streams. July- 
August . 
' pectinatus, L. P. marinus, MicJix. Fresh and brackish water „ 
July. 
