Helanthium tenellum: Difference between revisions

Narrow leaf chain sword
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Monocots
Order:	Alismatales
Family:	Alismataceae
Genus:	Helanthium
Species:	H. tenellum
Binomial name
	Helanthium tenellum; (Mart. ex Schult.f.) J.G.Sm.
Synonyms
	Alisma tenellum Mart. ex Schult.f. in J.J.Roemer & J.A.Schultes; Echinodorus tenellus (Mart. ex Schult.f.) Buchenau; Sagittaria tenella (Mart. ex Schult.f.) Kuntze; Alisma ranunculoides var. brasiliense A.St.-Hil.; Echinodorus parvulus Engelm. in A.Gray; Echinodorus subulatus Engelm. in A.Gray; Helanthium parvulum (Engelm.) Small in N.L.Britton & al.; Echinodorus tenellus var. ecostatus Fassett; Echinodorus tenellus var. parvulus (Engelm.) Fassett; Echinodorus tenellus f. randii Fassett;

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Revision as of 02:35, 11 February 2017

Helanthium tenellum is 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]

Description

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]

References

^ ^a ^b "World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew". apps.kew.org. Retrieved 2017-01-28.
^ Biota of North America Program Image
^ Buchenau, Franz Georg Philipp. 1868. Index Criticus Butomacearum, Alismacearum, Juncaginacearum 21.
^ Lord,, Britton, Nathaniel (1905-01-01). "Manual of the flora of the northern states and Canada /". {{cite journal}}: Cite journal requires |journal= (help)CS1 maint: extra punctuation (link) CS1 maint: multiple names: authors list (link)

External links

This monocot-related article is a stub. You can help Wikipedia by expanding it.

[kathyodonnell-1] "World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew". apps.kew.org. Retrieved 2017-01-28.

[2] Biota of North America Program Image

[3] Buchenau, Franz Georg Philipp. 1868. Index Criticus Butomacearum, Alismacearum, Juncaginacearum 21.

[4] Lord,, Britton, Nathaniel (1905-01-01). "Manual of the flora of the northern states and Canada /". {{cite journal}}: Cite journal requires |journal= (help)CS1 maint: extra punctuation (link) CS1 maint: multiple names: authors list (link)

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 ==External links==
-*[http://www.tropicos.org/ImageFullView.aspx?imageid=100143264 photo of herbarium specimen collected in Missouri in 1845, ''Helanthium tenellum'']
+*[http://www.tropicos.org/ImageFullView.aspx?imageid=100143264 Photo of herbarium specimen collected in Missouri in 1845, ''Helanthium tenellum'']
-* [http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=222000054 Flora of North America ''Echinodorus tenellus'']
+* [http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=222000054 Flora of North America, ''Echinodorus tenellus'']
-* [http://plants.usda.gov/java/profile?symbol=ECTE2 US Department of Agriculture plant profile''Echinodorus tenellus'']
+* [http://plants.usda.gov/java/profile?symbol=ECTE2 US Department of Agriculture plant profile, ''Echinodorus tenellus'']
 * [http://pages.infinit.net/natura/echinodorus-tennelus.html Mary-Ann Lambert, Natura, Les Plantes aquatiques, ''Echinodorus tenellus'']
-* [http://www.efloras.org/florataxon.aspx?flora_id=11&taxon_id=222000054 Flora of Missouri''Echinodorus tenellus'']
+* [http://www.efloras.org/florataxon.aspx?flora_id=11&taxon_id=222000054 Flora of Missouri, ''Echinodorus tenellus'']
 * [http://www.aquahobby.com/garden/e_tenellus.php AquaHobby, The Age of Aquariums, ''Echinodorus tenellus'']
 * [http://www.thekrib.com/Plants/Plants/chain-swords.html Krib discussions]