Pinguicula is abundant in the north temperate zone, and ranges down the Andes as far as Patagonia; the 250 species of Utricularia are mostly aquatic, and some are found in all save polar regions; their unimportant congeners, Genlisea and Polypompholix, occur in tropical America and south-western Australia respectively.
In Utricularia bladder-like sacs are formed by a modification of leaflets on the submerged leaves.
The products of the decay of the organisms thus A, Bladder of Utricularia neglecta (after Darwin), enlarged.
BLADDER-WORT, the name given to a submerged water plant, Utricularia vulgaris, with finely divided leaves upon which are borne small bladders provided with trap-door entrances which open only inwards.
Found the most serviceable: - Hydrophytes (submerged aquatic plants) .Plants whose vegetive organs live wholly in water; e.g., most Algae, many mosses, ch as Fontinalis spp., and liverworts, such as Jungermannia spp.; few Pteridophytes, such as Pilularia spp., Isoetes spp.; several wering plants, such as Potamogeton pectinatus, Ceratophyllum p., Hottonia palustris, Utricularia spp., Liltorella lacustris.
Aquatic vegetation may be conveniently classified as follows: Aquatic plants with submerged leaves: Chara spp., Naias spp., Potamogeton pectinatus, Ceratophyllum spp., Myriophyllum spp., Hottonia palustris, Utricularia spp.