182 THE BOTANY OF WESTERN AUSTRALIA. 
stems spreading for many yards under ground, and some growing 
wholly above ground; this plant is distinguished from all these by its 
styles, which are three times as long as in any described Dryandra ; 
another creeping-rooted, or rather creeping-stemmed sort is distin- 
guished by having strong woody dissepiments to the seeds, whereas D. 
nivea agrees with D. Preissii and D. proteoides in the structure of the 
seeds ; it is a sort of Diplophragma. A new Hemiclidium, with leaves 
like Dryandra armata, but not so pungent as they are in that plant, 
grows in abundance on an ironstone hill with the new silvery-leaved 
Petrophila. 
Close to Davidson's station, on the left bank of the Moore river, be- - 
sides these Proteaceous plants which I have described, belonging to 
well-known genera, I met with two plants, which I suppose form the 
types of new genera of this Order. One has the habit of Persoonia ; it 
grows in low spreading bushes from three to four feet high; the leaves 
are linear, about three inches long and a quarter of an inch wide, co- 
vered with stomates above and below; the flowers borne in the axils 
of the upper leaves. With the exception of the style and stigma, the 
other parts of the flower had fallen off when I found the plant. The 
seed-vessels are very different from Persoonia, being follicles an inch 
and a half long by three-quarters of an inch wide; they are deeply and 
irregularly grooved lengthwise, that is, the grooves are unequal in 
breadth and depth on the same seed-vessel; they each contain a single 
seed about an inch long, shaped like a seed of the Ash; each seed is 
enclosed by three membranous coverings: the outer and inner are 
smooth and brown, not unlike the wings of the seeds of Hakea and - 
Banksia in substance; the middle membrane is of a light brown colour 
and very brittle; this plant grows on the great sand-plain to the north 
of the Diamond Spring. The other plant, which I suppose forms a new 
genus of this Order, grows fifteen feet high ; the leaves are deeply pin- 
natifid, the pinnæ are narrow, stand out at right angles, and are rigid 
and very pungent; I saw only the old flower-stalks of this plant, with 
three perfect seed-vessels, they are the size of, and as round as, a 
musket-ball; the capsules are thin in substance and of equal thickness 
all round, thé two seeds which fill up their inside being exactly hemi- 
spherical in shape, with thickened margins, without any vestige of wings. 
This plant, which creeps by its roots, grows in plenty over the great 
sand-plain between the Hutt and the Murchison, but flowers had only 
