166 
MONOECIA, POLYANDMA. 
heterophyiia? 3. S, Icavcs simple, linear and lanceolate, acute at 
each end, or elliptical acute ; base obtuse, sa- 
gittate ; lobe divaricate, linear ; scape simple, 
few-flowered ; flowers monoicous, feminine 
sessile ; bractes broad-ovate, acuminate.-— 
Pursh, 
S. lancifolia, Bart. Prod. FI. Pb. 
Varying-leaved Mrow-head, 
I am not certain that the plant intended above, is Pursh’s 
heterophyiia, but it fits the description in part. It can hardly 
be the lancifolia of Mich., which is a southern plant. In 
similar places with No. 1, common, varying* in size from one to 
three feet. The scapes are round, the long petioles triangular ; 
sheathing at the root. In a pool on the left of the road near 
Lemon-hill, abundant. Perennial. June, August. 
acutifoiia. 4. S. leaves subulate, sbeathiug at the base ; back 
convex ; scape simple, few-flowered ; flowers 
monoicous ; bractes dilated, acuminate. — Pursh. 
Jlcute-leaved Jlrrow-liead. 
From three to ten inches high. Leaves often with a dilated 
point. On the marshy shores of the Delaware, at low tide ; 
common. Perennial. July, August. 
subuiata, 5 . S. leaves linear, obtuse and short, the summits 
foliaceous ; scape simple, shorter than the leaves; 
flowers monoicous, few ; female flower solitary, 
deflected ; stamina mostly seven. — JSutt. 
S. pusilla, Nutt. 
Alisma subulata, Pursh. 
From one to three or four inches high. I have strong sus- 
picions that this is nothing more than a variety of No. 4. For 
the present I leave it undecided. With No. 4, common. Pe- 
rennial. July, August. 
