LOC.  Juxta fluvium Murray, anno 1841, detexit Domina Grey.

12.  Cassia (phyllodinea), canescens pube arctissime adpressa, phyllodiis aphyllis linearibus planis falcatis aversis, calycibus glabris, legumine plano-compresso.

LOC.  In Herbario D. Sturt specimen exstat nulla stationis aut loci indicatione, 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.  Eadem omnino species exstat inter plantas in Insulis Archipelagi Dampieri juxta oram septentrio-occidentalem Novae Hollandiae in itinere navis Beagle dictae lectas.