168 ENGLISH BOTANY. 
Var. a, vulgaris. 
Stem and leaves clothed with simple and forked hairs. 
Var. 6, glabrata. 
Stem and leaves smooth, or the latter more or less ciliated at, 
the margins. 
On dry banks, rocks, and old walls. Var. « not uncommon, 
though rather sparingly distributed throughout the whole kingdom 
from Cornwall and Kent to Ross-shire. To var. 6 apparently belongs 
a plant gathered by Mr. Andrews in Great Arran Island on the 
west coast of Ireland, which Mr. Hewett C. Watson has in his 
Herbarium; but these specimens have not mature pods and seeds, 
from which the only definite characters by which this can be 
separated from A. ciliata, var. genuina, are taken, though in the 
flowering state it agrees remarkably well with A. hirsuta, var. 
glabrata (Wahl.), sent from Gothland by Mr. C. Hartman. These 
Trish specimens are the only ones which I have seen that can be 
referred to var. 6 of A. sagittata. 
England, Scotland, Ireland. Biennial or Perennial. Summer. 
Extremely like A. ciliata, but usually taller, the stems being 
A inches to 2 feet or more high, and the leaves, at least the upper 
ones, have no rudiment of a leaf stalk, but are produced at the 
base into two rounded or slightly pointed lobes. The flowers are 
rather smaller; the pods longer and considerably narrower, being 
1 to 13 inch long by a little less than 3/5 inch broad, and are also less 
compressed. The seeds are a little shorter and only half as broad, 
truncate at the base, from which the sides are quite parallel with 
each other to the rounded apex, and like those of A. ciliata they 
appear finely punctured under the microscope and winged all 
round. Plant greyish green, more or less hairy. 
A. hirsuta of British authors is certainly the plant usually 
called A. sagittata by Continental writers, as that species is 
described as having the seeds punctured, in contradistinction to 
those of A. hirsuta, ‘‘ Scop.” which has the seeds not punctured, 
and winged only at the apex according to Reichenbach, Koch, 
Boreau, Godet, ete. Reichenbach also represents the seed of this 
form (which may be called A. Reichenbachil) as enlarged towards 
the apex, a character which separates it still more widely from the 
British plant. It is probable that these plants, together with 
A. Gerardi (Bess), A. Allionii (D. C.), A. ciliata (Brown), and 
A. arcuata (Shuttl.), are all merely sub-species of one super-species, 
to which I have given the name of A. hirsuta, which has been 
applied to most of them separately or together. 
ee 
