Bladderworts (Utricularia)

Group I. lvs minute & linear or none; bladders minute or none

lvs dichotomously branched or dissected, us. conspspicuous olor submersed stems; bladders us. well-developed

Group II. lvs in whorls of 4-9

Group III. lvs all alternate, none of them inflated; fls yellow

Group I. lvs minute & linear or none; bladders minute or none

... conspicuous spur regular spur
2)bracts accompanied each by a pair of bractlets; fls yellow ..... .....
3) bractlets oblong, acute; lower cor-lip 9-16mm horned b.w. (1.cornuta) wet shores; NF to FL .....
3) bractlets subulate, very narrow; lower lip to 12mm ..... rushlike b.w. (2.juncea) wet shores of bogs & ponds on or near the coastal plain; s NY to FL
2) bracts not accompanied by bractlets ..... .....
4) fls violet, solitary & terminal ..... resupinate b.w. (3.resupinata) slim undivided lvs, fringed w/ a few speck-sized bladders, half-buried in soil, either under or out of water, often overlooked until the turf beneath flower is dug out; muddy soil or very shallow water at ehe edge of ponds; NS to FL
4) fls yellow, few or solitary ..... zigzag or slender b.w. (4.subulata) tiny undivided lvs are half-buried in soil, either under or out of water; speck-sized bladders are on underground branches; wet soil & very shallow water, often among mosses; NS to FL

Group II. leaves in whorls of 4-9

.......... all parts of the lvs slender uppermost lvs with the rachis inflated into a whorl of floats
fls rose-purple, 1/2" long purple b.w. (5.purpurea) quiet water; QE to FL along the coast .....
fls yellow ..... .....
peduncles 1-5 fld, 3-5cm; floats 1-4cm ..... floating b.w. (6.radiata) ponds along or near coastal plain; ME to FL
peduncles us. 6-14 fld, 10-25cm; floats 3-8cm ..... inflated b.w. (7.inflata)X; ponds along the coastal plain; DE to FL

Group III.

..... leafy stem loosely floating forming mats: ..... .....
..... ..... lvs once forked lvs dimorphic; 2 or 3x dichotomous lvs alike, bladeder-bearing, us twice forked
8) lower cor-lip about twice as long as the upper ..... ..... ..... .....
lower cor-lip 8-12mm, w/ well-developed palate flat-leaved b.w. (8.intermedia) shallow water; s to DE ..... ..... .....
lower lip 4-8mm, with small or no palate lesser b.w. (9.minor) shallow water; s to NJ ..... ..... .....
8) lower cor-lip little if at any longer than the upper ..... ..... ..... .....
peduncles, below the lowest bract, with 1-few widely scattered bract-like scales; lower lip mostly 1-2cm common b.w. (10.vulgaris) quiet water; s to FL ..... ..... .....
peduncles without scales below the bracts; lower lip mostly 6-8mm mixed b.w. (11.geminiscapa) resembles #10; quiet water; NF to e VA      
lower cor lip 5-6mm, well exceeding the thick, very blunt spur ..... creeping or humped b.w. (12.gibba) shallow water; QE to FL ..... .....
lower lip 8-10mm, about equaling or slightly shorter than the conic spur ..... ... (13.fibrosa) shallow ponds on coastalplain; e MA to FL (14.biflora) much like #13; shallow water on coastal plain; e MA to FL