24 FLORA OF PHILADELPHIA. 



3. ZANNICHELLIA L. Horned Pondweed. 



1. ZANNICHELLIA PALUSTRis L. M. p. 50. Fresh or brackish ponds. Sum- 

 mer. 

 Bucl:s—A-ada\i\sia,Mart. (Fr.). Delaware— Tinicum, T. C. Palmer (Fu.). 

 Oceo?i— Forked Eiver (Cr.) (Ja.). 

 New Castle— I'ort Penn, Brandywine Creek, East Channel. 



4. NAIAS L. Naiad. 



1. Naias tlexilis (Willd.) Kost. & Schmidt. M, p. 51. Ponds and slow 

 streams. Summer. 

 ^Mcfcs— Sellersville (Fr.). Delaware — Valley of Darby Creek (B. Sm.). 

 Chester— (P.). Lancaster — Susquehanna opposite Marietta (Le.). North- 

 amptonSajloT Lake, Wind Gap (He.). 



Camden— Delaware Eiver, Camden, Mart. (B. C). Gloucester— 'Re- 

 paupo Meadows (He.), Big Timber Creek (Li.). 

 New Castle— Common. 



5. ZOSTERA L. 



1. ZosTERA marina L. Grass-ivracl; , Eel-grass. M. p. 51. Shoal water of 

 bays along coast. Summer. 



Family 2. SOHEUCHZERIAOEAE Agardh. 

 Leaves all basal; flowers numerous, in a spike-like raceme. 1. Trigloclun. 

 Stem leafy; flowers few in a loose raceme. 2. Scheuclizeria. 



1. TRIGLOCHIN L. Arrow-Grass. 



1. Triglochin maritima L. M. p. 52. Salt marshes. Summer. 

 Ocean— Point Pleasant (Br.) (Ja.). 



2. SCHEUCHZERIA L. 



1. ScHEUCHZERiA PALUSTRIS L. M. p. 53. Bogs. Summer. 

 BucTcs-Rook Hill (Cr.). 

 Camden— Longacoming (C). Gloucester — Eepaupo. 



Family 3. ALISMACEAE DC. Water Plantain Family, 



Carpels in a ring upon a small, flat receptacle. 1. Alisma. 



Carpels crowded in many series upon a large convex receptacle. 



Flowers perfect, staminate or polygamous. 2. Lophotocarpus. 



Flowers monoecious or dicEcious. 3. Sagittaria. 



1. ALISMA L. 



1. Alisma Plantago-aquatica L. Water Plantain. M. p. 54. Shallow 

 water and ditches. Summer. 



2. LOPHOTOCARPUS T. Durand. 



1. Lophotocarpus calycinus (Engelm.) J. G. Smith. M. p. 55. Swamps. 

 Summer. 

 New Cast Ze—Shelpot Creek, Delaware City, Augustine Pier. 



