In regard too to such forms as appear to constitute genera hitherto undescribed, it greatly exceeds the much more extensive herbarium, collected by Sir Thomas Mitchell in his last expedition, in which the only two plants proposed as in this respect new, belong to genera already well established, namely, Delabechia to Brachychiton, and Linschotenia to Dampiera.

In Captain Sturt’s collection, I have been obliged, from the incomplete state of the specimens, to omit several species, probably new, from the following account, in which the plants noticed, chiefly new genera and species, are arranged according to the order of families in the Prodromus of De Candolle.

BLENNODIA.

    Cruciferarum genus, prope Matthiolam.

Char.  Gen.—­Calyx clausus, foliolis lateralibus basi saccatis.  Petala aequalia, laminis obovatis.  Stamina:  filamentis edentulis.  Ovarium lineare.  Stylus brevissimus.  Stigma bilobum dilatatum.  Siliqua linearis valvis convexiusculis, stigmate coronata, polysperma.  Semina aptera pube fibroso-mucosa tecta!  Cotyledones incumbentes!

Herba (v.  Suffrutex) erecta ramosa canescens, pube ramosa; foliis lato-linearibus remote dentatis; racemis terminalibus.

1.  BLENNODIA canescens.

LOC.  In arenosis depressis.

DESC.  Suffruticosa, sesquipedalis, caule ramisque teretibus.  Folia vix pollicaria paucidentata.  Racemi multiflori, erecti, ebracteati.  Flores albicantes.  Calyx incano-pubescens.  Petalorum ungues calyce paulo longiores.  Stamina 6, tetradynama, filamentis linearibus membranaceis apice sensim angustato.

OBS.  This plant has entirely the habit, and in many important points the structure of Matthiola, near which in a strictly natural method it must be placed; differing, however, in having incumbent cotyledons, and in the mucous covering of its seeds.  The mucus proceeds from short tubes covering the whole surface of the testa, each containing a spiral fibre, which seems to be distinct from the membrane of the tube.  A structure essentially similar is known to occur generally in several families:  to what extent or in what genera of Cruciferae it may exist, I have not ascertained; it is not found, however, in those species of Matthiola which I have examined.

STURTIA.

    Malvacearum genus, proximum Gossypio, affine etiam Senrae.

Char.  Gen.—­Involucrum triphyllum integerrimum.  Calyx 5-dentatus, sinubus rotundatis.  Petala cuneatoobovata, basi inaequilatera.  Columna staminum polyandra.  Ovaria 5, polysperma.  Styli cohaerentes.  Stigmata distincta linearia.  Pericarpia . . .  Semina . . .

Suffrutex orgyalis glaber; foliis petiolatis obovatis integerrimis; floribus pedunculatis solitariis.

2.  Sturtia Gossypioides.

LOC.  “In the beds of the creeks on the Barrier Range.”—­D.  Sturt.