PARSLEY WATER-DROPWORT

Oenanthe lachenalii

Carrot Family [Apiaceae]

month8jul month8july month8aug month8sep month8sept

status
statusZnative
flower
flower8white
inner
inner8pink
morph
morph8zygo
petals
petalsZ5
type
typeZumbel
stem
stem8round
stem
stem8ribbed
toxicity
toxicityZhigh
contact
contactZmedium

8th July 2014, on marshy foreshore, Southport, Sefton Coast. Photo: © RWD
Grows to 1m high on brackish marshy salt-plains, as well as some other wet mainly-coastal places.


23rd July 2015, on marshy foreshore, Birkdale slacks, Sefton Coast. Photo: © RWD
Stems thinner than most other Water-dropworts.


23rd July 2015, on marshy foreshore, Birkdale slacks, Sefton Coast. Photo: © RWD
Has but few, about 6-8, umbels. White flowers in compound umbels 50-60mm across. Leaves very narrow and pinnate.


23rd July 2015, on marshy foreshore, Birkdale slacks, Sefton Coast. Photo: © RWD
By silhouette.


8th July 2014, on marshy foreshore, Southport, Sefton Coast. Photo: © RWD
Plant is hairless. Bracts beneath umbels number between none to five and are short if present. Flowers not yet fully opened on this umbel.


8th July 2014, on marshy foreshore, Southport, Sefton Coast. Photo: © RWD
Flowers small.


8th July 2014, on marshy foreshore, Southport, Sefton Coast. Photo: © RWD
Flowers may have a pink tinge when only partially open.


8th July 2014, on marshy foreshore, Southport, Sefton Coast. Photo: © RWD
Unopened florets. Pale brown bits may be sepals. Central flowers pale-greenish when still un-opened.


23rd July 2015, on marshy foreshore, Birkdale slacks, Sefton Coast. Photo: © RWD
Un-opened flowers with their pale-greenish tinge. Opened flowers on the periphery displaying 5 stamens with reddish anthers.


8th July 2014, on marshy foreshore, Southport, Sefton Coast. Photo: © RWD
Half-opened florets. Those near the centre never fully open.


8th July 2014, on marshy foreshore, Southport, Sefton Coast. Photo: © RWD
Fully opened and larger florets around the periphery of each umbel displaying noticeable zygomorphism with larger petals on the outside . Petals have nicks in them.


8th July 2014, on marshy foreshore, Southport, Sefton Coast. Photo: © RWD
Anthers red, but pollen probably white, resulting in a pink coloration (for now). Petals may be very pale pink until fully opened.


23rd July 2015, on marshy foreshore, Birkdale slacks, Sefton Coast. Photo: © RWD
Five stamens with deep-red anthers (dropped off on lowest filament). The largest petals appear to be notched, but are not actually; they have a fold in the middle taking up the excess width (this is typical for those Umbellifers where the petals get large at the periphery, but not all umbellifers exhibit this characteristic.


23rd July 2015, on marshy foreshore, Birkdale slacks, Sefton Coast. Photo: © RWD
Brownish-red and toothed sepal teeth beneath each floret are present here (but may be absent as they are on many other umbellifers or occur only sporadically). Stamens with white pollen still present protrude above the flowers.


23rd July 2015, on marshy foreshore, Birkdale slacks, Sefton Coast. Photo: © RWD
Stems grey-green and ribbed but hairless. Stems usually solid with thick walls and a pity centre (althought some specimens are hollow). Beneath each sub-umbel are a multitude of pointed linear bracts with reddened tips.


8th July 2014, on marshy foreshore, Southport, Sefton Coast. Photo: © RWD
Upper leaves are 1 to 3-pinnate, with linear to long-ovate leaflets. [Lower leaves (not shown) are slightly wider and elliptical].


8th July 2014, on marshy foreshore, Southport, Sefton Coast. Photo: © RWD
Leaflets here tipped purple, but this is not an ID feature.


23rd July 2015, on marshy foreshore, Birkdale slacks, Sefton Coast. Photo: © RWD
Sheaths at stem junctions are not in the least inflated.


23rd July 2015, on marshy foreshore, Birkdale slacks, Sefton Coast. Photo: © RWD
The roots after pulling up out of relatively soft mud (no doubt the finer roots are still in the mud)


Not to be semantically confused with : Great Water-parsnip (Sium latifolium nor with Wild Parsnip (Pastinaca sativa) nor with Parsley Water-dropwort ((Oenanthe lachenalii) nor with Garden Parsley (Petroselinum crispum) nor with Milk Parsley (Thyselium palustre) nor with Fool's Parsley (Aethusa cynapium), Cow Parsley (Anthriscus sylvestris), Upright Hedge-Parsley (Torilis japonica), Stone Parsley (Sison amonum), Corn Parsley (Petroselinum segetum) [all plants with similar names belonging to the same Umbellifer Family (Apiaceae)].

No relation to : Dropwort (Filipendula vulgaris) [a plant with similar name belonging instead to the Rose Family].

Slight resemblance to : Narrow-leaved Water-dropwort (Oenanthe silaifolia), Parsley Water-dropwort (Oenanthe lachenalii) but the pinnate leaves of these have broader leaves.

Uniquely identifiable characteristics

Distinguishing Feature : The long and narrow leaflets (which are part of the leaves which are 1-3 pinnate) but sparse. The only Water-dropwort growing in brackish marshes and fens near the sea.

Un-like all other Water-dropworts apart from Corky-fruited Water-dropwort (Oenanthe pimpinelloides) but that is stout, has pink flowers and is only found in the South of the UK and in just an isolated hectad here or there, the stems are mostly solid (but some do have hollow stems). Leaves few long and narrow, unlike most other Water-dropworts apart from perhaps Fine-leaved Water-dropwort (Oenanthe aquatica), but that has far more leaflets and is not salt-tolerant.

The fruits (not yet shown) are egg-shaped.


  Oenanthe lachenalii  ⇐ Global Aspect ⇒ Apiaceae  

Distribution
 family8Carrot family8Apiaceae

 BSBI maps
genus8Oenanthe
Oenanthe
(Water-Dropworts)

PARSLEY WATER-DROPWORT

Oenanthe lachenalii

Carrot Family [Apiaceae]