Helanthium tenellum | |
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Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Monocots |
Order: | Alismatales |
Family: | Alismataceae |
Genus: | Helanthium |
Species: | H. tenellum |
Binomial name | |
Helanthium tenellum (Mart. ex Schult.f.) J.G.Sm. | |
Synonyms [1] | |
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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]
The leaves of H. tenellum are narrowly elliptical or lanceolate. At different times during the plant's life cycle, the blade of the leaf is scarcely distinguishable from the petiole, while at other times the petiole is 10 to 15 times as long as the blade, which may be 1–4 cm long and 0.2–1 cm wide, with a pointed tip. The base is decurrent to the petiole and has between one and three veins.
The stem is thin, erect, often curved, and may be 3–20 cm long. In small plants, the stem ends in a single inflorescence (umbel or coil); in larger plants the inflorescence is racemose, composed of two whorls placed one above the other. Bracts are free and 2–6 mm long in the first whorl. Pedicels are 1–3.5 cm long. Sepals are 3 mm long, membraneous, and usually have five fine ribs. During ripening, the sepals enlarge and reach a length of up to 6 mm and fully cover the aggregate fruit. A specimen may have six to nine stamens, each about 1 mm long. Anthers are 0.25 mm wide by 2.25 mm long, which is three times shorter than the filaments. It may have sixteen to eighteen pistils. The achenes are compressed, and arched in the apical part; they are (0.9) – 1.1 – (1.3) mm long, and black, with three lateral ribs. The basis of the stylar beak is under the level of the tip of the nutlet and may be 0.1–0.3 mm long. [3] [4]
It propagates by sending out runners and will also flower when grown emersed. [5]
It is endangered in Connecticut, [6] Illinois, Indiana, Kentucky, and Michigan. [7]
Helanthium tenellum is a common aquarium plant with a large variation in shapes and sizes kept by people for their aesthetic appeal. Its care is undemanding and it can adapt to a large range of conditions. [5]
Anemonoides quinquefolia, a flowering plant in the buttercup family Ranunculaceae, is native to North America. It is commonly called wood anemone or windflower, not to be confused with Anemonoides nemorosa, a closely related European species also known by these common names. The specific epithet quinquefolia means "five-leaved", which is a misnomer since each leaf has just three leaflets. A plant typically has a single, small white flower with 5 sepals.
Echinodorus, commonly known as burhead or Amazon sword, is a genus of plants in the family Alismataceae, native to the Western Hemisphere from the central United States to Argentina. Its scientific name is derived from Ancient Greek echius – "rough husk" - and doros – "leathern bottle" - alluding to ovaries, which in some species are armed with persistent styles, forming prickly head of fruit. Some of the species are commonly cultivated in artificial aquatic habitats.
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 and the southeastern United States.
Echinodorus horizontalis is a species of plant in the Alismataceae family. It is native to northern South America.
Echinodorus tunicatus is a species of aquatic plants in the family Alismataceae.
Echinodorus longiscapus is a perennial, aquatic plant of the Alismataceae, native to South America. It is cultivated as a pond or aquarium plant.
Echinodorus macrophyllus is a species of aquatic plants in the Alismataceae. It is native to Brazil and Bolivia.
In Rataj's taxonomy Echinodorus ovalis is in Section Cordifolii, Subgenus Echinodorus. It is related to Echinodorus cordifolius and listed by some authorities and importers as a synonym of that species, e.g. E. cordifolius 'ovalis'.
Echinodorus subalatus is a species of aquatic plants in the Alismataceae. It is native to Cuba, Mexico, Central America, Guyana, Venezuela, Bolivia, Brazil and Paraguay. It is found naturally growing in mud by the side of streams.
Echinodorus trialatus is a type of plant. In Rataj's taxonomy, E. trialatus is in Section Paniculati, Subgenus Echinodorus.
Echinodorus uruguayensis is a plant species in the Alismataceae. It is native to South America.
Echinodorus berteroi is an aquatic plant species in the Alismataceae It is native to the southern and central parts of the United States, as well as Central America, the West Indies, and South America as far south as Argentina.
Echinodorus bracteatus is a species of plants in the Alismataceae. It is native to Costa Rica, Nicaragua, Panama, Colombia and Ecuador.
Thalictrum thalictroides, the rue-anemone or windflower, is a herbaceous perennial plant native to woodland in eastern North America. It has white or pink flowers surrounded by a whorl of leaflets, and it blooms in spring.
Echinodorus grandiflorus is a plant species in the Alismataceae. It is native to Brazil, Paraguay, Uruguay, Argentina, Venezuela and Florida.
Trillium petiolatum, the Idaho trillium, also known as the long-petioled trillium or round-leaved trillium, is a species of flowering plant in the family Melanthiaceae. It is native to the northwestern United States, in Idaho, Oregon, and Washington. Its type specimen was gathered by Meriwether Lewis during the return trip of the Lewis and Clark Expedition in 1806.
Ribes velutinum is a species of currant known by the common name desert gooseberry.
Astrantia minor, the lesser masterwort, is a species of herbaceous plant belonging to the family of Apiaceae. It is native within Europe, to the countries of France, Italy, Spain and Switzerland. It is clump-forming herbaceous perennial.
Albidella is a genus of plants in Alismataceae. Currently, three species are known. It is native to Cuba and the Yucatán Peninsula.
Gonocarpus tetragynus is an Australian herb in the watermilfoil family Haloragaceae native to eastern Australia. Common names include common raspwort. A widespread species particularly found in dry eucalyptus forests, scrubland, and heathland.
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