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130 Alfred J. Ewart:

demarcation based on a group of constant characters, for Diels' distinctions
do not apply to all the specimens between this variety
and the type species. The typical form of the closely allied C.
Toddii of F. Mueller1 shows a trifling difference in the size and
acuminate character of the bracts, while the prianth tube is
rather more slender, is longer in proportion to the lobes, and
somewhat more slender, and is more pubescent outside. Even
these characters do not appear to be quite constant, so that C.
Toddii may also ultimately prove to be a variety of C. Polycephalum
when more intermediate material is available.

DAVIESIA CORYMBOSA, var. ST. JOHNII = D. CORYMBOSA, var.
VIRGATA. (Papilionaceae).

This plant was recorded in the Victorian Naturalist, Nov.,
1906, p. 133, and specimens have since been received from Mr.
C. French, Jr., collected at Ringwood. They are identical with
the D. virgata of Cunningham, which Bentham refers to D.
corymbosa, var. mimosoides. The condensed clusters of small
flowers and the very narrow leaves would, as suggested by Mr.
W.R. Guilfoyle, justify the recognition of a second variety
differing more widely from the type than var. mimosoides, even
though transition forms occur, but the name should be variety
virgata, in recognition of the old specific name for the variety.

DIPLOTAXIS MURALIS, D.C., the wall or sand mustard.
(Cruciferae)

This introduced alien has also been variously referred to as D.
muralis and D. tenuifolia, D.C. It has, however, the small
flowers and less divided leaves of the former. The Australian
specimens have the leaves less exclusively radical and more on
the stem, and are often double the normal height, frequently
reaching 12 to 16 inches. The plants also showa greater tendency
to be perennial, but these changes are probably climatic
ones, not necessarily of varietal significance, although they are
approaches towards D. tenuifolia, D.C.

1 Fragm. vol x., p. 20.