110 Kansas Academy of Science. 



cunnectives broad, petal-like. Carpels two to ten, usually four, distinct,, 

 one-seeded. Fruits drupe-like, seed nut-like; embryo coiled; endosperm 

 none, or very little. 



626. Potamogeton natans L. Floating Pondweed. Ponds, E. K. and 

 elsewhere; frequent. July. (ASU) 



627. Potamogeton diversifolius Rafinesque. (P. hybridusMx.) Bristly 

 Pundweed. Still waters. Cherokee and Wyandotte counties; rare. June. 

 (ASU) 



628. Potamogeton spirillus Tuckerman. Spiral-seed Pondweed. Ponds 

 and ditches, Shawnee and Riley counties; frequent. June. (AS) 



629. Potamogeton amplif olius Tuck. Large-leaf Pondweed. Lakes and 

 ponds, E. K. ; not common. July. (U). 



630. Potamogeton heterophyllus Schreber. Variable Pondweed. Still 

 water, scattered; infrequent. July. (S) 



63L Potamogeton lonchites Tuck. Long-leaf Pondweed. Slow streams, 

 W. K.. and some of the eastern counties; frequent. July. (ASU) 



632. Potamogeton lucens L. Shining Pondweed. Comanche county 

 (Hitchcock). Sept. (A) 



633. Potamogeton obtuaifolius Mertens & Koch. Blunt-leaf Pondweed. 

 Clay county (Hitchcock). July. (A) 



634. Potamogeton pusillus L. Small Pondweed. Ponds and slow 

 streams, Ellis county, north and west ; frequent to common. July. (ASU) 



635. Potamogeton foliosus Raf. Leafy Pondweed. Streams in C. K., 

 from Phillips and Jewell counties south to Pratt ; frequent. Sept. (AS) 



636. Potamogeton filiformis Pers. Thread-leaf Pondweed. Water in 

 calcareous regions, Mitchell county, south and west. Aug. (AU) 



637. Potamogeton pectinatus L. Fennel- leaf Pondweed. Brackish 

 waters, northern and central Kansas; occasional. July. (AS) 



638. Ruppia maritima L. Ditch-grass. Saline waters, Stafford, Rice, 

 Barton, Saline, and other counties of C. K. ; frequent. July. (S) 



639. Ruppia occidentalis Wats. Western Ditch-grass. To be found in 

 saline waters of N. W. K. July. 



640. Zannichellia palustris L. Horned Pondweed. Permanent brackish 

 waters, C. K.; not common. July. (AS) 



Family 44. Naiadace.e. Water-nymph Family. 



Submerged herbs, with fibrous roots and slender branching knotty stems. 

 Leaves (laminodia) opposite or verticillate, minutely serrulate, or thread- 

 like, and with broad basal sheaths. Flowers unisexual, monoecious or 

 dioecious, solitary in the axils, sessile or short-pediceled. Staminate flow- 

 ers with a double perianth, the outer four-pointed, the inner hyaline ; sta- 

 men one, sessile; anther unisporangiate. Carpellate flowers with a single 

 one-ovuled ovulary ; style short; stigmas two or three, with subulate stig- 

 moid processes between. Fruit an ellipsoid drupelet with a crustaceous 

 straw-colored pericarp. Seed smooth or sculptured with many rows of 

 minute tetragonal to hexagonal areolations. Embryo straight; endosperm 

 none. 



(■'41 Naias fiexilis Rostkof & Schmidt. Slender Water-nymph. Ponds 

 and still waters, C. and W. K. ; not common. June. (ASU) 



642. Naias guadalupensis Morong. Guadalupe Water-nymph. Ponds and 

 deepwater-holes along the Prairie Dog and Republican rivers, N. W. K, (S) 



