7 
of rarity or frequency of which no further information than is contained 
in the “ Flora” appears necessary to be given, or has been obtained. This 
line contains, on the left hand side, the number and name under which 
the species stands in the Catalogue, with an abbreviation of the name of 
the original authority for the latter. Next is placed one of the following 
series of terms,* used in the sense explained below, designed to express 
the degree of citizensliijD of the species, so far as can be judged from the 
evidence which has been obtained. 
Native. — Apparently an aboriginal Yorkshire species ; there being little 
or no reason for supposing it to have been introduced by human 
agency. Examples : Ranunculus acris, Beilis perennis, Calluna 
vulgaris, Coryllus Avellana. 
Denizen. — At present maintaining its habitats as if a native, without the 
aid of man ; yet liable to some suspicion of having been originally 
introduced. Examples: Viola odorata, Saponaria officinalis, Pyre- 
thrum Parthenium. 
Colonist. — A weed of cultivated land, and about houses ; seldom found, 
except where the ground has been adapted for its production by 
the operations of man. Examples : Papaver Rhceas, Brassica 
Napus, Lychnis Githago. 
Alien. — Now more or less established, but either presumed or certainly 
known to have been introduced by human agency. These may be 
arranged under two classes : — 1st. Species introduced by horticul- 
ture. Examples : Corydalis lutea, Mimulus luteus. And 2nd. Spe- 
cies introduced by agriculture, or with ballast. Examples : Alyssum 
calycinum, Lolium italicum, Trifolium incarnatum. 
Incognit. — Reported as a Yorkshire plant ; but either certainly erroneous, 
or extinct, or requiring confirmation before it can be received with 
complete confidence. Of species reported through errors in nomen- 
clature, Hieracium villosum, Centaurea jacea, and Stachys ger- 
manica, are examples. Others have been placed in Yorkshire lists, 
on faith of localities which are not within the limits of the county ; 
as Vaccinium uliginosum, Woodsia ilvensis. Amongst those species 
which have formerly occurred, but are now probably extinct, are, 
Vide “ Cybele Britarmica,” vol. i. page 63. 
