The following list excludes planted trees and shrubs, except where those species are naturalised (ie surviving for several years from self-sown seed).  All species are listed in alphabetical order; alien species are listed at the bottom, and hybrids are included where their populations are considered to be self-supporting. Status codes: AN: Notable species in the former county of Avon (as defined by Bristol Regional Environmental Records Centre) NS: Nationally Scarce species LL: Species on Biodiversity Long List List compiled by Wessex Ecological Consultancy.  Last updated 13th October 2005. Acer campestre Field maple Acer pseudoplatanus Sycamore Achillea millefolium Yarrow Adoxa moschatellina Moschatel Frequent in hedges on east shore Aegopodium podagraria Ground elder Agrimonia eupatoria Agrimony Agrostis stolonifera Creeping bent Agrostis tenuis Common bent Ajuga reptans Bugle Alchemilla filicaulis Lady’s mantle AN, very rare in unimproved grassland Alisma plantago-aquatica Water-plantain Alliaria petiolata Jack-by-the-hedge Allium ursinum Ramsons Allium vineale Crow garlic Alnus glutinosa Alder Alnus incana Grey alder Alopecurus geniculatus Creeping foxtail Alopecurus pratensis Meadow foxtail Anagallis arvensis Scarlet pimpernel Angelica sylvestris Wild angelica Anisantha sterilis Sterile brome Anthoxanthum odoratum Sweet vernal grass Anthriscus sylvestris Cow parsley Apium nodiflorum Fool's water-cress Arctium minus Lesser burdock Arenaria serpyllifolia Thyme-leaved sandwort Recorded for first time in 2003 Armoracia rusticana Horse radish Abundant in shallow water Arrhenatherum elatius False oat-grass Artemisia biennis Slender mugwort AN, a US species, usually found in UK around grain importers Artemisia vulgaris Common mugwort Arum maculatum Cuckoo-pint Atriplex patula Common orache Atriplex prostrata Spear-leaved orache Barabarea intermedia Medium-flowered winter-cress Barbarea vulgaris Common winter-cress Bellis perennis Daisy Bidens cernua Nodding bur-marigold AN, very rare on east shore Bidens trifida Trifid bur-marigold AN, abundant when water levels drop Bolboschoenus maritimus Sea club-rush AN, several large patches, eg at Moreton and Villice Brachypodium sylvaticum Wood false-brome Brassica nigra Black mustard Briza media Quaking grass Bromopsis erecta Upright brome Bromopsis ramosa Hairy brome Bromus lepidus Slender soft brome AN Bromus mollis Soft brome Bromus racemosus Smooth brome AN Bryonia dioica White bryony Buddleia davidii Buddleia One found on the Parkland in 2005 Butomus umbellatus Flowering rush AN, uncommon - a few patches dotted around the lake Callitriche platycarpa Various-leaved water starwort Callitriche stagnalis Common water starwort Caltha palustris Marsh marigold AN, rare, most frequent at Stratford Calystegia sepium Hedge bindweed Campanula trachelium Nettle-leaved bellflower AN, rare at Hollow Brook Capsella bursa-pastoris Shepherd's purse Cardamine flexuosa Wavy bittercress Cardamine hirsuta Hairy bittercress Cardamine pratensis Cuckoo flower Carex acutiformis Lesser pond sedge AN, forming large patches Carex caryophyllea Spring sedge Carex disticha Brown sedge AN, in marshy vegetation, increasing Carex divulsa Grey sedge Carex flacca Glaucous sedge Carex hirta Hairy sedge Carex otrubae False fox sedge Carex ovalis Oval sedge AN, much less frequent than disticha Carex panicea Carnation sedge AN Carex pendula Pendulous sedge Carex remota Remote sedge Carex riparia Great pond sedge Carex spicata Spiked sedge Carex sylvatica Wood sedge Catapodium rigidum Fern grass AN Centaurea cyanea Cornflower AN, NS - once on a new island on Herriott's Pool in 1985 only Centaurea nigra Black knapweed Centaurea scabiosa Greater knapweed Centaurium erythraea Centaury Cerastium fontanum Common mouse-ear chickweed Cerastium glomeratum Clustered mouse-ear chickweed Cerastium tomentosum Snow-in-summer Ceratophyllum demersum Rigid hornwort AN Chaenorhinum minus Small toadflax New in 2006 - Woodford Car-park Chaerophyllum temulentum Rough chervil Chenopodium album Fat hen Chenopodium ficifolium Fig-leaved goosefoot AN Chenopodium polyspermum Many-seeded goosefoot AN Chenopodium rubrum Red goosefoot Chr'splenium oppositifolium Opposite-leaved Golden-saxifrage Found at Herriott's in 2007 Cichorium intybus Chicory Circaea lutetiana Enchanters nightshade Cirsium arvense Creeping thistle Cirsium eriophorum Great woolly thistle Cirsium palustre Marsh thistle Cirsium vulgare Spear thistle Clematis vitalba Old man's-beard Clinopodium vulgare Wild basil Cochlearia danica Danish scurvy grass Along the A368 at Herriott's Bridge Colchicum autumnale Meadow saffron AN, Denny Island only Conium maculatum Hemlock Conopodium majus Pignut Convolvulus arvensis Field bindweed Cornus sanguinea Dogwood Coronopus squamatus Swine-cress Corylus avellana Hazel Crataegus monogyna Hawthorn Crepis capillaris Smooth hawk's-beard Crepis setosa Bristly hawk’s-beard Naturalised at Herriott’s Bridge and Heron's Green Bay Crepis vesicaria Rough hawk's-beard Cymbalaria muralis Ivy-leaved toadflax Cynosurus cristatus Crested dogstail Dactylis glomerata Cocksfoot Dactylorhiza fuchsii Common spotted orchid Rare around Parkland Dactylorhiza maculata Heath spotted orchid A big patch on the Parkland Dactylorhiza praetermissa Southern marsh orchid Rare, scattered around Dactylorhiza x grandis Hybrid marsh orchid Moreton Danthonia decumbens Heath grass AN, rare around Parkland Daphne laureola Spurge-laurel Recorded for first time in 2003 Daucus carota Wild carrot Deschampsia caespitosa Tufted hairgrass Dipsacus fullonum Teasel Dryopteris dilatata Broad buckler fern Dryopteris filix-mas Male fern Eleocharis palustris Common spike rush Elodea canadensis Canadian pondweed Elodea nuttallii Nuttall’s pondweed Elymus canina Bearded couch Elytrigea repens Common couch Epilobium angustifolium Rosebay willowherb Epilobium hirsutum Great willowherb Epilobium montanum Broad-leaved willowherb Epilobium obscurum Short-fruited willowherb AN Epilobium roseum Pale willowherb AN Epilobium tetragonum Square-stemmed willowherb Epipactis helleborine Broad-leaved Helleborine Several plants found on Whalley Bank in 2006 Equisetum arvense Field horsetail Equisetum fluviatile Water horsetail Equisetum palustre Marsh horsetail Equisetum telmateia Greater horsetail Erodium cicutarium Storksbill AN Erophila verna Spring whitlow grass Erysimum cheiranthoides Treacle mustard AN, Sutton Wick Euonymus europaeus Spindle Eupatorium cannabinum Hemp agrimony Euphorbia amygdaloides Wood spurge Euphorbia helioscopa Sun spurge Euphorbia peplus Petty spurge Festuca arundinacea Tall fescue Festuca gigantea Giant fescue Festuca pratensis Meadow fescue Festuca ovina Sheep’s fescue Festuca rubra Red fescue Filipendula ulmaria Meadow sweet Fraxinus excelsior Ash Galanthus nivalis Snowdrop AN, Hollow Brook, River Chew Galeopsis tetrahit Common hemp-nettle AN Galium aparine Cleavers Galium mollugo Hedgerow bedstraw Galium palustre Marsh bedstraw Galium uliginosum Fen bedstraw AN Galium verum Ladies bedstraw Genista tinctoria Dyers greenweed AN, grassland around Parkland Geranium dissectum Cut-leaved cranesbill Geranium molle Dovesfoot cranesbill Geranium pratense Meadow cranesbill Geranium robertianum Herb robert Geum rivale Water avens AN, Herriot’s Pool Geum urbanum Wood avens Glechoma hederacea Ground ivy Glyceria fluitans Flote grass Glyceria plicata Flote grass Gnaphalium uliginosum Marsh cudweed AN, abundant as water drops Groenlandia densa Opposite-leaved pondweed AN, rare and sporadic, Heron's Green Bay Hedera helix Ivy Heracleum sphondyllium Hogweed Hippuris vulgaris Marestail AN, large patch in Villice Holcus lanatus Yorkshire fog Hordeum murinum Wall barley Hordeum secalinum Meadow barley Hyacinthoides non-scriptus Bluebell AN, LL Hypericum hirsutum Hairy St John's wort Hypericum perforatum Perforate St John's wort Hypericum tetrapterum Square-stemmed St John's wort Hypochaeris radicata Common cat's ear Ilex aquifolium Holly Impatiens glandulifera Himalayan balsam Found growing quite commonly in Heron's Green (2007) Iris pseudacorus Yellow flag Isolepis setacea Bristle club-rush AN Juncus acutiflorus Sharp-flowered rush AN Juncus articulatus Jointed rush Juncus bufonius Toad rush Juncus compressus Round-fruited rush AN, Twycross, Stratford etc - spreading around lake Juncus conglomeratus Clustered rush AN Juncus effusus Soft rush Juncus inflexus Hard rush Kickxia elatine Sharp-leaved fluellin AN Knautia arvensis Field scabious Lactuca serriola Prickly lettuce Recorded for first time in 2003 Lagarosiphon major Curly waterweed Recorded for first time in 2003 Lamium album White dead-nettle Lamium purpureum Red dead-nettle Lapsana communis Nipplewort Lathryus linifolius Bitter vetch AN, rare at Heron’s Green Bay Lathyrus nissolia Grass vetchling AN, fairly frequent in grassand Lathyrus pratensis Meadow vetchling Lemna minor Common duckweed Lemna trisulca Ivy-leaved duckweed AN Leontodon autumnalis Autumnal hawkbit Leontodon saxatilis Lesser hawkbit Leucanthemum vulgare Ox-eye daisy Ligustrum vulgare Wild privet Limosella aquatica Mudwort AN, NS. Found at Moreton in 1995. Submerged most years Linaria purpurea Purple toadflax Linaria vulgaris Common toadflax Linum catharticum Purging flax Lolium perenne Perennial rye-grass Lonicera periclymenum Honeysuckle Lotus corniculatus Bird's-foot trefoil Lotus pedunculatus Greater bird's-foot trefoil Luzula campestris Field woodrush Luzula pilosa Hairy woodrush AN, hedges on east shore Lycopus europaeus Gipsywort Lysimachia nummularia Creeping jenny Lythrum salicaria Purple loosestrife Malus domestica Apple Malva moschata Musk mallow Malva sylvestris Common mallow Matricaria discoidea Pineappleweed Matricaria inodorata Scentless mayweed Medicago lupulina Black medick Medicago sativa Lucerne Mentha aquatica Water mint Mentha arvensis Corn mint AN Mercurialis perennis Dog's mercury Myosotis arvensis Field forget-me-not Myosotis discolor Changing forget-me-not AN Myosotis scorpioides Water forget-me-not Myosoton aquaticum Water chickweed AN Myriophyllum spicatum Spiked water milfoil AN Nasturtium officinalis Water-cress Nigella damascene Love-in-the-mist Nitellopsis obtusa Starry stonewort A Red Data Book species - found in 2004 Oenanthe crocata Hemlock water dropwort Oenanthe pimpinelloides Corky-fruited water dropwort AN, spreading in grasslands Oenothera glazioviana Large-flowered evening primrose Ononis repens Creeping restharrow Ononis spinosa Spiny restharrow AN Ophioglossum vulgatum Adder's tongue fern AN, rare on Parkland Ophrys apifera Bee orchid AN, rare by Parkland Orchis morio Green-winged orchid AN, huge colony on Parkland Papaver dubium Long-headed poppy Papaver rhoeas Field poppy Persicaria amphibia Amphibious bistort Forming large patches Persicaria hydropiper Water pepper AN Persicaria lapithifolia Pale persicaria Persicaria maculosa Redshanks Petasites fragrans Winter heliotrope Petasites hybridus Butterbur AN, Stratford Phalaris arundinacea Reed canary-grass Phleum bertolonii Small timothy Phleum pratense Timothy Phragmites communis Reed Phyllitis scolopendrium Hart's tongue fern Picris echioides Bristly oxtongue Pilosella officinarum Mouse-ear hawkweed Pimpinella saxifraga Burnet saxifrage Plantago lanceolata Ribwort plantain Plantago major Ratstail plantain Plantago media Hoary plantain Poa annua Annual meadow-grass Poa humilis Spreading meadow-grass AN Poa pratensis Smooth meadow-grass Poa trivialis Rough meadow-grass Polygonum aviculare Knotgrass Polygonum rurivagum Knotgrass Polystichum aculeatum Hard shield-fern AN Polystichum setiferum Soft shield-fern Potamogeton berchtoldii Small pondweed AN, most frequent member of genus Potamogeton crispus Curled pondweed AN Potamogeton pectinatus Fennel pondweed AN Potamogeton pusillus Lesser pondweed AN Potentilla anserina Silverweed Potentilla erecta Tormentil Potentilla reptans Creeping cinquefoil Potentilla sterilis Barren strawberry Primula x polyantha False oxlip Fine clump at Stratford Primula veris Cowslip Primula vulgaris Primrose Prunella vulgaris Selfheal Prunus spinosa Blackthorn Pulicaria dysenterica Fleabane Quercus robur Pedunculate oak Ranunculus acris Meadow buttercup Ranunculus aquatilis Water crowfoot AN Ranunculus bulbosus Bulbous buttercup Ranunculus circinatus Fan-leaved water-crowfoot Loads growing in the new ponds at Nunnery Ranunculus ficaria Lesser celandine Ranunculus repens Creeping buttercup Ranunculus sceleratus Celery-leaved buttercup Raphanus raphanistrum Wild radish Ribes nigrum Black currant AN Rorippa palustris Marsh yellow-cress AN Rorippa sylvestris Creeping yellow-cress AN Rosa arvensis Field rose Rosa canina Dog rose Rosa stylosa Short-styled field rose Rubus caesius Dewberry Rubus fruticosus agg Bramble Rumex acetosa Sorrel Rumex conglomeratus Clustered dock Rumex crispus Curled dock Rumex maritimus Golden dock AN, scattered around lake, flowering only in dry years Rumex obtusifolius Broad-leaved dock Rumex sanguineus Bloody dock Sagina apetala Upright pearlwort AN Sagina procumbens Procumbent pearlwort Salix alba White willow Salix caprea Goat willow Salix cinerea Sallow Salix fragilis Crack willow Salix triandra Almond willow AN, rare in main reeds Salix viminalis Osier Sambucus nigra Elder Samolus valerandi Brookweed AN, rare, Herriott’s Pool Schoenoplectus lacustris Bulrush AN Scrophularia auriculata Water figwort Sedum acre Biting stonecrop Senecio aquaticus Marsh ragwort AN Senecio erucifolius Downy ragwort Senecio jacobaea Common ragwort Senecio squalidus Oxford ragwort Senecio vulgaris Groundsel Serratula tinctoria Saw-wort AN, rare, Parkland Silaum silaus Pepper saxifrage AN Silene dioica Red campion Sinapis arvensis Charlock Sison amomum Stone parsley Sisymbrium officinale Hedge mustard Solanum dulcamara Woody nightshade Solanum nigrum Black nightshade Sonchus arvensis Field sow-thistle Sonchus asper Prickly sow-thistle Sonchus oleraceus Smooth sow-thistle Sparganium erectum Branched bur-reed Stachys officinalis Betony Stachys palustris Marsh woundwort Stachys sylvatica Hedgerow woundwort Stellaria graminea Lesser stitchwort Stellaria holostea Greater stitchwort Stellaria media Chickweed Succisa pratensis Devil's-bit scabious Symphytum officinale Comfrey Tamus communis Black bryony Taraxacum vulgaris agg Dandelion Thlaspi arvensis Field penny-cress AN Torilis japonica Upright hedge parsley Tragopogon pratensis Goat's-beard Trifolium dubium Lesser trefoil Trifolium fragiferum Strawberry clover AN, rare Parkland and Moreton Trifolium medium Zigzag clover AN, widespread in grasslands, especially around Villice Trifolium pratensis Red clover Trifolium repens White clover Tripleurospermum inodorum Scentless mayweed Trisetum flavescens Yellow oat-grass Tussilago farfara Coltsfoot Typha latifolia Greater reedmace Ulex europaeus Common gorse Self-seeded on the Nunnery car-park 'mound' Ulmus glabra Wych elm Ulmus procera English elm Urtica dioica Nettle Valerianella locusta Cornsalad AN Verbascum thapsus Greater mullein New in 2004 Veronica beccabunga Brooklime Veronica catentata Pink water-speedwell AN Veronica chamaedrys Germander speedwell Veronica hederifolia Ivy-leaved speedwell Veronica persica Common field-speedwell Veronica polita Grey field-speedwell Veronica serpyllifolia Thyme-leaved speedwell Viburnum lantana Wayfaring tree Viburnum opulus Guelder rose Vicia bithynica Bithynian vetch AN, NS. Was at Parkland Vicia cracca Tufted vetch Vicia hirsuta Hairy tare Vicia sativa Common vetch Vicia sepium Bush vetch Vicia tetraspermum Four-leaved tare AN Viola odorata Sweet violet Viola reichanbachiana Early dog violet Viola riviniana Common dog violet Viscum album Mistletoe The following species have been recorded where birds are fed on the causeways at Heron's Green Bay and Herriott's Bridge.  Most are sporadic in appearance but some have become established for a few years.  Autumn until the first frosts after a hot summer is the best time to look for these plants - new species are recorded in most years. Amaranthus albus White pigweed New in 2003 Amaranthus hybridus Green amaranth Amaranthus retroflexus Common amaranth Ambrosia artemisifolia Common ragweed New in 2003 Ambrosia trifolia Greater ragweed New in 2003 Ammi majus Bullwort Persisted for five years Ammi visnaga Toothpick plant Anchusa arvensis Bugloss A UK native, but recorded only as a bird seed introduction in 2003 Asperula arvensis Blue wood-ruff Brachiaria platyphylla Broad-leaved signal-grass Brassica juncea Chinese mustard Cannabis sativa Hemp Carthamus tinctorius Safflower New in Heron's Gren Bay in 2005 Chenopodium probstii Probst's goosefoot New in 2003 (Heron's Green Bay) - the third Avon record Digitaria sanguinalis Hairy finger-grass Echinochloa crus-gallii Cockspur Fagopyron esculentum Buckwheat Guizotia abyssinica Niger Helianthus annuus Sunflower Linum usitasissimum Flax Lycopersicon esculentum Tomato Several plants found growing in Spring Bay in 2005 Panicum milliaceum Common millet Phalaris canariensis Canary grass Setaria viridis Green bristle-grass Solanum rostratum Buffalo-bur Triticum aestivum Wheat Zea mays Maize