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THE PLAN OF THE CATALOGUE

PART I	Rare species, as defined below.
PART II	Aliens, including species native in Britain but not in Cambridgeshire. Species which are in Part I are added if they are aliens, doubtfully native or are increasingly recorded as garden-throw-outs when there are recent corrections and additions and a link is provided between Parts I and Part II.
PART III	Common and Uncommon species.

Nomenclature follows Clive Stace, (1997) New Flora of the British Isles (Second edition) CUP; DH Kent, Supplements 1 & 2; EJ Clement & MC Foster,(1994) Alien Plants of the British Isles; SM Walters, JE Cullen et al, 1986–2000, The European Garden Flora, vols 1–6, CUP.

The area currently being used for recording the flora of Cambridgeshire is the botanical vice-county 29 and the administrative county boundary of old Cambridgeshire and Isle of Ely, that is without pre-1965 Huntingdonshire and the Soke of Peterborough.

The species accounts are prefaced by their conservation status and the date of the first and last record, and in Part II and Part III by the date of the first record.

Key to Conservation status:
The categories are defined in the Red List in Wiggington, M.J. (1999), British Red Data Books. 1. Vascular Plants, 3rd Ed. JNCC.

CR	Critically Endangered
EN	Endangered
VU	Vulnerable
LR	Near threatened
EW	Species extinct in Britain as a wild plant
EX	Extinct in Britain
>3	Red List and nationally Scarce species with more than 3 sites in Vc.29

N	Nationally scarce species as per Stewart, Pearman and Preston, (1994), Scarce Plants in Britain. JNCC
C	County rarities are those species which occur in 3 sites or less, and which have been present for 3 consecutive years or more since 1970. A site is defined as all individuals encompassed by a 1Km square laid in any direction on the map

The 21 species currently on Schedule 8 of the Wildlife and Countryside Act 1981 are: Ajuga chamaepitys, Alisma gramineum, Alyssum alyssoides, Atriplex pedunculata, Chenopodium vulvaria, Crepis foetida, Dactylorhiza incarnata subsp. ochroleucon, Filago lutescens, Filago pyramidata, Gnaphalium luteoalbum, Himantoglossum hircinum, Lactuca saligna, Liparis loeselii, Lythrum hyssopifolia, Melampyrum arvense, Mentha pulegium, Ophrys sphegodes, Pulicaria vulgaris, Selinum carvifolia, Senecio paludosus, Teucrium scordium

Only 3 species have an international label: Himantoglossum hircinum, Liparis loeselii and Lycopodium clavatum. The extinct Bromus interruptus was our only British endemic species.

There are 4 species which have long been known as county rarities but which recently have been introduced, either directly or indirectly by man, resulting in their occurrence in more than 3 sites. They are Festuca brevipila, Lepidium ruderale, Plantago coronopus and Puccinella distans.

Quantity, habitat, site, parish, grid reference, collector, date, determiner, herbarium abbreviation.

Duplicate sheets have not been catalogued

Abbreviations and initials are written in full.

Cambridge and Cambridgeshire omitted unless essential or in the city.

Grid references: the 100KM letters/number is omitted (see above).

All dates have been standarised into arabic numerals, in order of day, month, year

Century added to all dates where they have been omitted

Records without a source are from CNHS & G Crompton's card index.

[R] = Records from Vc 29 Recorder's computer programme ‘Recorder’.

Conventions used in printed works: see Abbreviations