130 LIST OF SEEDS, BULBS, TUBERS, ETC. 
with a free placenta, bearing several anatropous seeds, 
with a thick straight embryo and no albumen. 
UrricuLarta—Bladder-wort. 
U. inflata:—Still water, Maine to Texas near the 
coast. 
U. Clandestina:—Ponds, from New Brunswick and 
New England to New Jersey, near the coast. 
U. vulgaris:—Common in ponds and slow streams, 
Newfoundland to Minnesota, south to Virginia and 
Texas, and westward. 
U. minor:—Shallow water, Massachusetts to Minne- 
sota, south to New Jersey and Arkansas. 
U. biflora:—Ponds and shallow water, South Illinois 
and Iowa to Texas, also South Virginia. 
U. gibba:—Shallow water, Massachusetts to Mich- 
igan, south to Virginia and Illinois. 
U. fibrosa:—Shallow pools in pine barrens, New Jer- 
sey to Florida and Alabama. 
U. intermedia:—Shallow pools, Newfoundland to 
New Jersey, west to lowa, Minnesota and northward. 
U. purpurea:—Ponds, Maine and North Pennsyl- 
vania to Florida, near coast, also Lake County, Indiana. 
U. resupinata:—Sandy margins of ponds, Maine to 
Rhode Island, near the coast, also North New York 
and Lake Erie. 
Order PONTEDERIACE :—Aquatic herbs, with 
perfect, more or less irregular flowers from a spathe; 
the petal-like six-nervous perianth free from the three- 
celled ovary; the three or six, mostly unequal or dis- 
similar, stamens inserted on its throat. _ 
PoNTEDERIA—Pickerel weed. 
P. cordata:—Nova Scotia to Florida, west to Minne- 
sota and Texas. 
