ESSEX BOTANY AND MYCOLOGY GROUPS
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ESSEX BOTANY AND MYCOLOGY GROUPS |
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Apium inundatum:
109.30.4 C LISTPRIVATE
APIUM INUNDATUM Lesser Marshwort
Update: 2009
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10 km sq records post 1987-1999: Great Britain: c.431 further 360 not confirmed post 1970 (less 45%)
ESSEX: 8(-7) ESSEX 1 KM SQS: 13 (-12)
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CONSERVATION STRATEGY: ENDANGERED/RAPIDLY DECREASING.
Necessary to maintain marginal shallows free of competing vegetation in the ponds that it already occurs in. Can be readily eliminated by dredging. Needs silty bottom. The newly established Crassula helmsii competes with it for space in many sites. Necessary to take active conservation measures throughout the U.K. to stem the rapid decline in the number of localities.
____________________________________________________________________________________________________STATUS NOTES:
Native. A small rather non-descript aquatic of silty marginal shallows in ponds, easily overlooked for a mud form of a water crowfoot. Declining rapidly. Estimated 40% decrease in 10 km sqs in England between 1962 (Atlas of British Flora) and 1989 (BSBI Monitoring Scheme). Well established in several Epping Forest ponds, but very vulnerable to dredging (see entries for Epping Lower Forest lake, Earl's Path and Goldings Hill ponds). Currently only known from Oak Pond High Beach, Epping Forest where it is likely to be lost due to Crassula helmsii.
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POST 1950 RECORDS:
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TQ(51)39 |
39 ,91 |
18 |
Epping Forest, Woodford, nr. Napier Arms, 1953, Mrs L M Small. |
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398,948 |
18 |
Epping Forest, Butlers Pond, abundant, south-east corner,1988. Kenneth J Adams. No sign 2008. Crassula helmsii heav blanket. |
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TQ(51)49 |
415,967 |
18 |
Epping Forest, Earls Path Pond, south-east corner shallows, 1976. Kenneth J Adams & J Owen Mountford. ditto. Pond thoroughly dredged in late 1976. (Not seen since, up to 1993) |
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413,965 |
18 |
Epping Forest, Strawberry Hill Pond, 1973. Kenneth J Adams. [pond since fully dredged] |
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429,981 |
18 |
Goldings Hill Upper Pond, 1948. Bernard T Ward. Epping Forest, colony in shallows, about half way along eastern shore. June 1971. KJA |
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ditto east shore shallows 1971-1991 Kenneth J Adams. |
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(extinct? removed together with Berula erecta by drastic dredging in October 1991.) Not seen since [up to 2009] |
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41039,97977 G
40994,97929 G |
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18 |
Epping Forest, Oak Pond, (Speakman’s Pond), High Beach, check first dates. 2006 (only 2-3 plants),2007,2008 in NE corner, abundant. Area now covered by Crassula helmsii (2009). 5 small rosette plants in centre of dried up pond 2011. c. 6 tiny plants around SW margin 10 July 2009. K J Adams |
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TL(52)40 |
471,033 |
19 |
Epping Lower Forest lake, 1963. Eric Saunders. |
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ditto 1971. Kenneth J Adams. |
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ditto, south west corner, 12 August 1978. Kenneth J Adams. |
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(extinct? lake dredged drastically in winter of 1990/91). |
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482,085 |
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Harlow Common pond, 1969, Douglas H Kent. (extinct - pond destroyed during M11 construction). |
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TQ(51)59 |
559,968? |
18 |
Navestockside, pond, 1983. Jeremy Milton. |
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TL(52)51 |
536,111 |
19 |
Matching Green Pond, 1960. Stanley T Jermyn. ditto. One plant only on mud. 1982. John L Fielding. |
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TL(52)81 |
879,144/5 |
19 |
Tiptree Heath, pond on southern margin of the heath cleared previously by Fred Boot et al, 1987. Laurie Forsyth. (No sign, 1991 or 1992. Chris Gibson). or 2009. K J Adams. |
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TL(52)91 |
94 ,16 |
19 |
Abberton Reservoir, 1953. Stanley T Jermyn. |
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TL(52)92 |
94 ,26 |
19 |
Fordham Heath, 1962 to 1967. Extinct? Stanley T Jermyn. |
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PRE 1950 RECORDS:
. Cooks Folly Wood, Woodford. 1915. R W Robbins. (HANDLIST LON.NAT.)
. nr Walthamstow. 1915 R W Robbins. (TRANS LNHS 1915 44 1916) (HANDLIST)
. Leyton Flats, 1909. C S Nicholson. (HANDLIST)
. Chingford, 1908. P H Cooke. (HANDLIST)
. Baldwins Hill pond (which one?), Loughton. 1917. E B Bishop. (HANDLIST).
. Dunmow Common, Gibson. (FLORA 1862)
. Dunmow Common, July 1843, specimen collected by Gibson in Passmore Edwards
Museum herbarium.
. Wethersfield, Gibson. (FLORA 1862)
. Galleywood Common, A Greenwood. (FLORA 1862)
. Danbury, ponds near, Jonathan Grubb. (FLORA 1862)
. Hatfield Forest, Gibson. (FLORA 1862)
. Snaresbrook, W L P Garnon. (FLORA 1862)
. Woodford, Richard Warner (FLORA 1862)
. Latton Common, Daniel S French. (FLORA 1862)
. Epping, near, Henry Doubleday. (FLORA 1862)
. Between Romford & Dagenham, Thomas Moore. (FLORA 1862)
. Rochford, Thomas Benson. (FLORA 1862)
. Tiptree Heath, Ezekeil Varenne. (FLORA 1862)
. Ponds on Ardleigh Common, W H Coleman. (FLORA 1862) .
. Epping Forest,"nearly fills some of the southern ponds", J T Powell c1892. (Es.Nat. 6. p.5.) date?
. Felsted, (Es.Nat. 5. p.136.) date?