35G MONOECIA.— POLYANDRIA. 



spreading, lanceolate, long-acuminate ; flowers 

 mostly dioecious. 



y. gracilis : leaves linear ; lobes much spreading, 

 linear, very long and acute. 



J\ pubescens : leaves and stem pubescent ; bracts and 

 calyx very pubescent. 



HAB. Ponds, &c. July. U. Leav. large; scape 

 1 — 2 ft. long ; fl. large, wh., verticil, in 3's. 

 2. S.obtusa : leaves sagittate, dilated-ovate, rounded 

 at the extremity, mucronate ; lobes approximate, 

 oblong, obliquely acuminate, straight ; flowers 

 dioecious ; sterile scape branched at the base. 



IIAB. Ponds. Jury. U. Leav. large ; sap milk n. 

 affording gum ; fl. wh. 

 ?■>. S. heterophylla : leaves simple, linear and lanceo- 

 late, acute at each extremity, or elliptical and 

 sagittate, with the lobes linear and divaricate : 

 scape simple, few-flowered ; flowers monoecious, 

 the fertile subsessile. 



IIAB. Ponds. July. U. . Scape \ ft. high; leav* 

 rarely sagitt. 



4. S. rigida : leaves narrow-lanceolate, carinate be- 



neath, rigid, very acute at each extremity ; scape 

 branched ; flowers monoecious. 

 IIAB. Deep water. July — Aug. 4 . Very tall ; 

 petioles stiff ; fl. numerous. 



5. S. simplex : leaves linear-lanceolate, acute, nar- 



rowed towards the base ; scape simple, many 

 flowered ; flowers dioecious. 

 HAB. Muddy banks, &c. Aug. U. Scape 8— 15 

 ni. high ; leav. not rigid j fl. small. 



6. S. acutifolia : leaves subulate, sheathed at the base. 



convex on the back ; scape simple, few-flowered, 

 longer than the leaves ; flowers monoecious. 

 HAB. Muddy shores. Aug. H . Scape 6 in* 

 high; fl. pedunc. ; stam. 12 — 15. 



7. S. pusilla : leaves linear, obtuse and short, a little 



flattened, foliaceous at the summit ; scape simple, 

 mostly shorter than the leaves ; flowers monoe- 

 cious, few ; fertile flowers deflexed. 

 HAB. Muddy shores. Aug. H . Scape 2—4 in* 

 high ; fl. very small, fertile subsolit* 



