OBS.  In the collection presented to the British Museum by Sir Thomas Mitchell, of the plants of his last expedition, there is a very perfect specimen, in flower, of Grevillea Sturtii.

The following observations respecting the Grevilleae of the same collection may not be without interest.

Grevillea Mitchellii, Hooker, in Mitch.  Trop.  Austr. p. 265, proves to be Gr.  Chrysodendron, prodr. fl.  Nov.  Holl. p. 379, the specific name of which was not derived from the colour of the under surface of the leaves, which is, indeed, nearly white, but from the numerous orange-coloured racemes, rendering this tree conspicuous at a great distance.

Grevillea longistyla and G. juncea of the same narrative, both belong to that section of the genus which I have named Plagiopoda.

A single specimen, in most respects resembling Gr. longistyla, of which possibly it may be a variety, but which at least deserves notice, has all its leaves pinnatifid, instead of being undivided.  It may be distinguished by the following character:—­Grevillea (Plagiopoda) neglecta, foliis pinnatifidis subtus niveis; laciniis linearibus, stylis glabris.

A single specimen also exists of Grevillea (or Hakea) lorea, prodr. flor.  Nov.  Holl. p. 380, but without fructification.

24.  Grevillea (cycloptera?) lineata, foliis indivisis lineari-ens formibus enerviis subter striis decem paucioribus elevatis uniformibus interstitia bis-terve latitudine superantibus, cicatrice insertionis latiore quam longa utrinque obtusa, racemis terminalibus alternis, pistillis semuncia brevioribus stigmate conico.

LOC.  “It takes the place of the gum-tree (Eucalyptus) in the creeks about lat. 29 degrees 30 minutes S.”  D. Sturt.

OBS.  It is difficult to distinguish this species, which, according to Captain Sturt, forms a tree about 20 feet in height, from Grevillea striata.  I have endeavoured to do so in the above specific difference, contrasted with which the leaves of G. striata have always more than 10 striae, which are hardly twice the breadth of the pubescent interstices, and the cicatrices of whose leaves are longer than broad, and more or less acute, both above and below.  This is a source of character which in the supplement to the Prodr.  Florae Novae Hollandiae, I have employed in a few cases both in Grevillea and Hakea, but which I believe to be important, as it not only expresses a difference of form, but also in general of vascular arrangement.

25.  Ptilotus (latifolius) capitulis globosis, bracteis propriis calycem superantibus, foliis ovatis petiolatis.

LOC.  “In lat. 26 degrees S.”—­D.  Sturt.

DESC.  Herba diffusa, ramosa, incana.  Folia alterna, petiolata, lateovata, integerrima.  Capitula ramos terminantia, solitaria vel duo approximata.  Bracteae laterales scariosae, sessiles, late ovatae, enerviae.  Perianthium; foliolis subaequalibus, lana implexa alba basi tectis, ante expansionem ungue nervoso tunc brevissimo, post anthesin laminam scariosam enervem fere aequante.  Stamina 5 antherifera; filamenta basi in cyathulum edentulum connata.  Antherae biloculares, loculis utrinque distinctis medio solum conjunctis.  Ovarium monospermum, glabrum.  Stylus filiformis, glaber.  Stigma capitatum, parvum.  Utriculus evalvis, ruptilis.