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Helanthium tenellum "parvulum"

°C
°dKH
Aquarium suitability: yes
Usage: Nano tanks, Foreground, group, Foreground, ground cover
Difficulty: medium
Growth: medium
See also: Helanthium tenellum , Ranalisma rostratum
Range and localities: 

Eastern and southeastern USA; exact locality of the aquarium strains unknown


Synonyms: 
  • Echinodorus parvulus Engelm.
  • Helanthium parvulum (Engelm.) Small
  • Echinodorus tenellus, nordamerikanische Form
  • Echinodorus tenellus 'Broad Leaf'
  • Helanthium tenellum 'Broad Leaf'
  • Echinodorus tenellus 'Green'

Misapplied names: 
  • Ranalisma rostrata

Habit, plant type:

  • rosette
Botanical name [?]: Helánthium tenéllum (Mart. ex Schult. f.) J. G. Sm.

Major group (unranked): Seed plants: Flowering plants (Angiosperms)
Order: Alismatales
Family: Alismataceae
Genus: Helanthium

Description: 

Helanthium tenellum "parvulum" is a light green, usually smaller and wider-leaved form of Helanthium tenellum (= Echinodorus tenellus). It was probably first imported from North America. Decades ago, this was the aquarium plant generally known as Echinodorus tenellus, today it is only rarely cultivated any more. Its submersed leaves are always light green, never reddish, up to a little over 2 mm wide and widest below the middle.
The plant usually sold under the name H. tenellum today was imported from the American tropics (Brazil?), and its submersed leaves are generally of an olive green to reddish colour, longer and narrower (up to around 1.5 mm) that are widest above the middle (see Helanthium tenellum). Its emersed, flowering form also differs clearly from H. tenellum "parvulum".

A well-growing clone of H. tenellum "parvulum" has spread in the hobby, under the erroneous name "Ranalisma rostrata". True Ranalisma rostratum from Asien indeed looks rather like the submersed form of Helanthium tenellum, its emersed form, however, differs clearly (see Ranalisma rostratum).

To be continued...

Light medium to high 
Temperature tolerance 10 to 30 °C
Optimum temperature 18 to 26 °C
Carbonate hardness 0 to 14 °dKH
pH value 5 to 7.5 
Carbon dioxide (CO2) 20 to 40 mg/l
Nitrate (NO3-) 10 to 50 mg/l
Phosphate (PO43-) 0.1 to 3 mg/l
Potassium (K+) 5 to 30 mg/l
Iron (Fe) 0.01 to 0.5 mg/l

Growth: medium

Propagation: Runners

Can grow emersed?: yes

Suited for outdoor cultivation / ponds: unknown

Winter hardiness: unknown

There is no detailled information for cultivating this plant yet.
Aquascaping: forms a grass-like lawn

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