i6o REPORT OF NEW JERSEY STATE MUSEUM. 



Sparganium americanum androcladum (Engelm.). Branching Bur-reed. 



Sparganium simplex var androcladum Engelmann, in Gray's Manual Ed. 5- 



481. 1867 [N. England southward especially westward]. 

 Sparganium simplex Knieskern 30. — Barton II. 149. 

 Sparganium androcladum Britton 252. 



In swamps common throughout, except in the Pine Barrens, 

 where it is hirgely replaced by the preceding'. 



Fl. — June, July. Fr. — Mid-July to late September. 



Middle District. — Toms River (P), Farmingdale, New Egypt, Kinkora 

 (NY), Tomlin (S), Swedesboro. 



Pine Barretts. — Parkdale, Bear Swamp (S), Cedar Brook, Clementon (S), 

 Winslow (S), Landisville, Twelfth St., Egg Harbor City, Manumuskin (S). 



Cape May. — Cold Spring. 



Order NAJADALES. 



Floating or erect aquatic or swamp plants, including the Pond 

 weeds. Arrow-heads, etc., generally distributed throughout our 

 region. 



Family NAJADACE^. Pondweeds, Etc. 



The Pondweeds occur in most of the ponds and streams of 

 our region often mingled in great masses with Utricularias, 

 Ceratophyllum and other water plants. Most of the species can 

 be recogiiized by the oval floating leaves, so different from the 

 thin, usually grass-like submerged foliage, but others are entirely 

 submerged and only to be identified by their fruit or minute 

 flowers. The eel grass of the coast is a rather distinct and 

 familiar species. 



Flozuering and Fruiting Data. — Dates indicate period of ma- 

 ture fruit. Flowers appear in late spring through the summer. 



Key to the Species. 



a. Stem and leaves very slender, capillary or linear. 



h. Fruit, 2-6 in a cluster, sessile or slightly pedicelled, 2-4 mm. long, 

 slender, curved and beaked. Leaves 25-75 mm- long. 



Zanichellia palustris, p. 165 

 bb. Fruit, 5-7 in an umbel on a pedicel, often spirally twisted ; 2 mm. 

 long, ovoid, beaked. Leaves 25-75 rnm. long. 



Ruppia maritima, p. 165 

 bbb. Fruit, solitary, sessile, ellipsoid. 



