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Helanthium tenellum, the pygmy chain sword, is a species of plants in the Alismataceae. It is native to the eastern United States (from Texas to Florida , north to Michigan and Massachusetts ), southern Mexico ( Chiapas , Veracruz ), West Indies (Cuba, Jamaica, Hispaniola ), Central America, South America (from Guyana to Argentina) [ 1 ] [ 2 ]
Most of these plant species are found either partially or fully submerged in their natural habitat. Although there are a handful of obligate aquatic plants that must be grown entirely underwater, most can grow fully emersed if the soil is moist.
Echinodorus are by nature marsh and bog plants that can grow submersed. Many species are grown in aquariums. They prefer good light and grow best in a deep, nutrient-rich substrate. Most will grow in variable water conditions, though the majority need tropical or sub-tropical temperature ranges. Propagation is by division or by adventitious new ...
Echinodorus cordifolius, the spade-leaf sword or creeping burhead, is a species of aquatic plants in the Alismatales. It is native to Mexico , the West Indies , Central America , South America (as far south as Paraguay ) and the southeastern United States ( Texas to Florida and as far north as Iowa ).
Tonestus pygmaeus, the pygmy serpentweed or pygmy goldenweed, is a species of flowering plant in the family Asteraceae. [2] [3] It is endemic to the western United States, where it is found in New Mexico, Colorado, Wyoming, and Montana. [3] The occurrence of pygmy serpentweed in Montana is based solely upon historical specimens. [3]
Females grow to 4.5 cm (1.8 in), while males attain 3.5 cm (1.4 in). The male's sword is only 1-2 mm long. [5] The species was originally thought to consist only of small-sized males (all less than 29 mm long and most less than 24 mm), but in 1994 it was discovered that two populations contain large males.
Idiosepiidae, also known as the pygmy squids, is a family of squids in the superorder Decapodiformes. [2] [3] They are the smallest known squids.[3]It is the only family in the monotypic order Idiosepida [4] and the monotypic superfamily Idiosepioidea. [5]
Lewisia pygmaea is a species of flowering plant in the family Montiaceae known by the common name alpine lewisia and pygmy bitterroot. It is native to western North America from Alaska and Alberta to California and New Mexico , where it grows in many types of moist, rocky mountain habitat, such as gravel beds and sandy meadows.