LIST OF SEEDS, BULBS, TUBERS, ETC. 127 
L. Minor, L.:—Fronds round to elliptic obovate 
(1—2$" in diameter), rather thick, very obscurely 
three-nerved; spathe sac-like; utricle short urn-shaped, 
tipped with a short style; seed oblong-obovate, amphi- 
tropous; with prominent rounded operculum.  Stag- 
nant waters, throughout North America. 
ALISMACE: (Water Plantain Family). 
AtisMA, L.—Water Plantain. 
A. Plantago, L.:—Perennial by a stout proliferous 
corm; leaves long-petioled, ovate, oblong, or lanceolate 
or even linear, acute, mostly rounded or heart-shaped 
at base, three to nine nerved; panicle loose, compound, 
many-flowered (i°—2° long), carpels obliquely ob- 
ovate, forming an obtusely triangular whorl in fruit. 
Shallow water and ditches; very variable as to foliage, 
but the leaves usually more broadly cordate-ovate than 
in old world forms. Variety Americanum (R. and S$.) 
when growing under water thinner and narrowly 
lanceolate. 
NAIADACEE (Pondweed Family). 
JuNcaGINE#:— Marsh plants, with terete bladeless 
leaves; flowers perfect, spicate or racemose, with 
herbaceous six (rarely three) lobed perianths; carpels 
three or six, more or less united, separated at matur- 
ity. Seeds anatropous, embryo straight. 
Triglochin, L.:—Arrow grass. T. palustris, L. 
NaiapE&:—-mmersed aquatics, with flat leaves, 
ovaries solitary or distinct, one-ovuled. 
PoTraAMoGETON, Tourn :—Pondweed. 
P. Natans, L. P. Pennsylvanicus, Cham. P. Ill- 
noinsis, Morong:—Ponds and stagnant water; com- 
mon. 
Order SELAGINELLACEAS 
