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Water hyacinth is a free-floating perennial aquatic plant (or hydrophyte) native to tropical and subtropical South America. With broad, thick, glossy, ovate leaves, water hyacinth may rise above the surface of the water as much as 1 m (3 ft) in height. The leaves are 10–20 cm (4–8 inches) across on a stem, which is floating by means of ...
P. azurea. Binomial name. Pontederia azurea. Sw. Pontederia azurea is a water hyacinth from the Americas, sometimes known as anchored water hyacinth. It is the type species of Pontederia subg. Eichhornia, which was previously recognized as part of the polyphyletic genus Eichhornia. [1] It is of some interest as an aquarium plant.
Eichhornia. Eichhornia, commonly called water hyacinths, was a polyphyletic genus of the aquatic flowering plants family Pontederiaceae. Since it was consistently recovered in three independent lineages, it has been sunk into Pontederia, together with Monochoria. Each of the three lineages is currently recognized as subgenera in Pontederia:
The mottled water hyacinth weevil, Neochetina eichhorniae, is a beetle that has been introduced as a biological pest control herbivore agent to waterways and lakes in countries worldwide to control the spread of the invasive noxious weed species Eichhornia crassipes, the water hyacinth, an aquatic plant native to the Amazon basin.
Charles Darwin was interested in the specialized form of heterostyly found in the family, known as tristyly. Not all of the species are heterostylous. The family contains two genera with around 40 known species. [3] [4] It is best known for the water hyacinth (Pontederia crassipes), which is an invasive species in many waterways.
The colour of the blue flower hyacinth plant varies between 'mid-blue', [21] violet blue and bluish purple. Within this range can be found Persenche, which is an American color name (probably from French), for a hyacinth hue. [22] The colour analysis of Persenche is 73% ultramarine, 9% red and 18% white. [23]
Marc Reisner, A Dangerous Place (2003) The Delta was formerly located at the bottom of a large inland sea in the Central Valley, which formed as the uplift of the California Coast Ranges blocked off drainage from the Sierra Nevada to the Pacific. About 560,000 years ago, water breached the mountains, carving out the present-day Carquinez Strait and San Francisco Bay. The drainage of all the ...
Brodiaea coronaria (California hyacinth) Ithuriel's spear (Triteleia spp.) Meadow onion (Allium monticola) Goldenstars (Bloomeria crocea) Brodiaeas (Brodiaea spp.) Blue dicks-ookow (Dipterostemon capitatus): one of the most common native bulb species throughout California; found in grassland and dry meadow habitats