•171 ALISMACE.E. (WATKK-rLANTAIN lAMlLV.) 



sterile llowers twice ns long as those of the fertile ones; acheuia ohovato 

 heakeii : lilaiiieiils smooth. (S. sagittifulia, iiastala, puliesccns, ole. uf authors.) 



— Marslies, ditches, etc. July - Sept. — Scape l°-3^ higli, augled. Leaves 

 •2'- 12' Inllg. 



♦ ♦ Filaments short, thirknK d at the base. 



.'5. S. heterophylla, rmsli. Scape weak; leaves linear or lanceolate, 

 ami acute at eacii end, or elliptical, and nhtuse (»r sagittate at the base; bracts 

 obtu,«ie; .sterile flowers on long and slender pedicels; the fertile ones nearly 

 sessile; achenia narrowly ohovato, loug-lieaked. — Schurlock's Spring, West 

 Florida, Tennessee, rare. — Leaves 2' -4' long. Scape few-flowered, the low- 

 est whorl only bearing fertile flowers. 



4. S. graminea, Michx. Scajic slemler, commonly pro.strate in fruit, 

 simple or branched ; leaves linear or lanceolate, acute at each end, 3-nerved, 

 erect, the earliest mostly destitute of a blade ; bracts membranaceous; flowers 

 small, all ou long filiform pedicels; stamens 10- 12, hairy at the base; achenia 

 ohovate, wing-keeled, beakless. — Shallow ponds in the pine barreu-s. May- 

 Oct. — Scape 10'- 15' high, usually longer than the leaves. 



■'. S. filiformis, J. G. Smith. Leaves filiform, bladeless ; scape filiform, 

 much branched, 2°-3° long; whorls 6-10, remote; fertile flowers 1-2; 

 stamens 7 ; mature achenia not seen. — Aquatic, floating in Stillwater, Florida 

 and Alal)ama (./. G. Smith). 



6. S. macrocarpa, J. G. Smith. Leaves linear-lanceolate ; scape simple, 

 10'- 12' high ; whurls 3 - 5 ; bracts ovate, connate ; fertile flowers 1 -3 ; sta- 

 mens about 12; achenia oblong-obovate, broadly winged, short-beaked, the 

 sides eveu. — Margins of ponds. South Carolina {Curtis). 



7. S. teres, Watson. Leaves terete, mostly bhideless ; scape simple, 6'- 

 15' liigli. few-Howered ; bracts ovate, obtuse ; fertile flowers 1 - 2 ; stamens 12 ; 

 achenia round-ol)ovate, short-beaked, creiiately crested on the back and sides, 



— Shallow water. South Carolina {Smith), and northward. 



s. S. natans, Miilix. Small; leaves floating, ovate-oblong or elliptical, 

 obtuse at each end or the lowest slightly cordate, 5-7-nerved, about as long 

 as the few-flowered scape ; bracts membranaceous, acute; pedicels of the fer- 

 tile flowers stouter tlian those of the sterile oues, recurved in fruit ; stamens 

 7 or 8 ; achenia ol)ovate, 3-ril)l)ed on the back, short-lieaked. — Sliallow ponds 

 and streams, Florida to South Carolina. June-Sej)t. — Scapes 3' -6' long. 

 Leaves 1 ' - 2' long. 



Yar. lorata, Chapm. Leaves strap-shaped, olituse, without a blade, nerve- 

 less; scapes floating or erect; flowers sometimes dioecious; aclienia consjjicu- 

 ously l)eaked, pimpled. — Bracki.sh water, along the coast. May -Sept. — 

 When growing in deep water the floating scapes are 2° -3° long; wheu on 

 muddy banks, only 3'- 5' high. 



Var. pusilla. Still smaller {\'-V high) ; leaves linear or sulmlate, 

 mostly with a short blade, longer than the 2-9-flowered scape. — With the 

 preceding. 



