NARROW-LEAVED WATER-PLANTAIN

Alisma lanceolatum

[Previously

Alisma lanceolata

]
Water-Plantain Family [Alismataceae]

month8jun month8june month8jul month8july month8aug

status
statusZnative
 
flower
flower8pink
 
inner
inner8yellow
 
morph
morph8actino
 
petals
petalsZ3
 
type
typeZtieredwhorls
whorled-
type
typeZpanicle
-panicles
stem
stem8round
 
sex
sexZbisexual
 

17th Aug 2011, Glasson Docks, Lancaster Canal, Lancs. Photo: © RWD
Ignore the very long, bright-green, linear leaves in the foreground: they are of another species of plant. But the paler-green, slightly narrower and much shorter leaves do belong to Narrow-leaved Water-plantain. It has flowers which are in whorls and many of the whorls 9especially lower whorls) are in panicles.


17th Aug 2011, Glasson Docks, Lancaster Canal, Lancs. Photo: © RWD
It being later in the season the 3-petalled pink flowers with yellow centre have been and gone on this specimen, leaving only the fruits which are in abundance.


17th Aug 2011, Glasson Docks, Lancaster Canal, Lancs. Photo: © RWD
Panicles of whorls. Below them the leaves which can be anywhere between narrow-elliptic to lanceolate-elliptic in shape (whereas the leaves of the similar looking Water-Plantain (Alisma plantago-aquatica)) are elliptical to ovate-elliptic). All leaves appear from below the level of the water from near the base of the plant.


17th Aug 2011, Glasson Docks, Lancaster Canal, Lancs. Photo: © RWD


17th Aug 2011, Glasson Docks, Lancaster Canal, Lancs. Photo: © RWD
The browned fruits.


17th Aug 2011, Glasson Docks, Lancaster Canal, Lancs. Photo: © RWD
The leaves are narrow rather than have a base which is rounded (as does Water-Plantain), it tapers gradually (cuneate). [The top of this specimen has been damaged]. The leaves are also long (rather than wider and much shorter as are those of Water-Plantain).


17th Aug 2011, Glasson Docks, Lancaster Canal, Lancs. Photo: © RWD
The


17th Aug 2011, Glasson Docks, Lancaster Canal, Lancs. Photo: © RWD
The fruits are said to be wider near the middle on Narrow-leaved Water-plantain. (Well, some are and some aren't on these specimens)...


Not to be semantically confused with : (Plantago lanceolata) being Ribwort Plantain [a non-aquatic plant with similar name]

Hybridizes with : Water-Plantain (Alisma plantago-aquatica) to produce Alisma × rhinocarpum which is intermediate in all characters but is sterile.

Some similarities to : other Water-plantains such as Water-Plantain (Alisma plantago-aquatica)

Distinguishing Feature : The Buttercup-type fruits: spherical but pointedly knobbly.

No relation to : Other Plantains [plants with similar names]. Water-Plantains belong in a differing Family to Plantains.


  Alisma lanceolatum  ⇐ Global Aspect ⇒ Alismataceae  

Distribution
 family8Water-Plantain family8Alismataceae
 BSBI maps
genus8Alisma
Alisma
(Water-Plantains)

NARROW-LEAVED WATER-PLANTAIN

Alisma lanceolatum

[Previously

Alisma lanceolata

]
Water-Plantain Family [Alismataceae]