icatione, sed eandem speciem ad fundum sinus Spencer's gulf dicti in
sterilibus apricis anno 1802 legi.

DESC. Frutex quadripedalis, ramosissimus. Phyllodia semper aphylla,
aversa, linearia, acuta, basi attenuata, plus minusve falcato-incurva,
biuncialia, 1/16 circiter unciae lata, exstipulata, paginis pube
arctissime adpressa canescentibus, margine superiore glandula unica
depressa obsoleta. Flores flavi, in umbella axillari 2-3 flora.

OBS. Cassia phyllodinea is one of the very few species of the genus,
which, like the far greater part of New Holland Acaciae lose their
compound leaves, and are reduced to the footstalk, or phyllodium, as it
is then called, and which generally becomes foliaceous by vertical
compression and dilatation. A manifest vertical compression takes place
in this species of Cassia.

A second species, Cassia circinata of Benth. in Mitch. trop. Austr. p.
384, is equally reduced to its footstalk, but which is without manifest
vertical compression. To this species may perhaps be referred Cassia
linearis of Cunningham MS., discovered by him in 1817, but which appears
to differ in having a single prominent gland about the middle of its
phyllodium: Bentham's plant being entirely eglandular.

These two, or possibly three species, belong to the desert tracts of the
South Australian interior. In the same regions we have another tribe of
Cassiae closely allied to the aphyllous species; they have only one pair
of foliola which are caducous, and whose persistent footstalk is more or
less vertically compressed. Along with these, and nearly related to them,
are found several species of Cassia, having from two to four or five
pairs of foliola which are narrow, but their footstalks are without
vertical compression, and their foliola are caducous, chiefly in those,
however, which have only two pairs.

PETALOSTYLIS.

Caesalpinearum genus, Labicheae proximum.

CHAR. GEN.--Calyx 5-phyllus, aequalis. Petala 5 subaequalia, patentia.
Stamina: Filamenta quinque sepalis opposita, quorum tria antherifera,
antheris basifixis linearibus, duo reliqua castrata. Ovarium
oligospermum. Stylus maximus, petaloideus, trilobus, lobo medio longiore
axi incrassata desinente in stigma obtusum simplex!

Frutex glaber, erectus. Folia alterna, pinnata cum impari, foliolis
alternis. Racemi axillares, pauciflori. Flores flavi.

13. PETALOSTYLIS Labicheoides.

LOC. "In the bed of a creek along with Sturtia." D. Sturt.

OBS.