This is unknown to me, and I have therefore reproduced Hooker's description. It appears to differ from all forms of D. avenoides in the short "almost terminal" awn. Professor Hackel suggests that it may be a variety of D. quadriseta, but the large spikelets and produced rhachilla hardly support such a view.
6. D. quadriseta, Benth. Fl. Austral. vii. 581.—Culms tufted, erect, stout or slender, smooth or rather rough, 1–3 ft. high. Leaves much shorter than the culms, variable in width, sometimes ⅛ in. broad and quite flat, at other times very narrow and setaceous or filiform, often involute, glabrous or minutely scaberulous; sheaths smooth or rough, grooved; ligules oblong, membranous. Panicle 1½–6 in. long, very narrow and spike-like, dense, cylindric, rarely broader and obscurely lobed, pale-green or brownish-green, shining; branches numerous, short, erect, branched from the base. Spikelets small, about ⅛ in. long, shortly pedicelled. Two outer glumes subequal, lanceolate, acuminate, keeled, keel mmutely scabrid, slightly hairy at the base, tip minutely but distinctly 4-awned; dorsal awn attached below the middle, sometimes almost basal, usually not much longer than the outer glumes. Palea almost as long as the flowering glume, narrow, 2-nerved. Rhachilla either not at all produced at the back of the palea or very obscurely so.—Agrostis quadriseta, R. Br. Prod. 171; Hook. f. Fl. Nov. Zel. i. 296; Handb. N.Z. Fl. 330; Buch. N.Z. Grasses, t. 26. Avena quadriseta, Labill. Pl. Nov. Holl. i. 25, t. 32.
North and South Islands, Stewart Island: Not uncommon throughout. Sea-level to 2500 ft.
Also abundant in Australia and Tasmania. The rhachilla is seldom produced at the back of the palea, so that the plant technically falls into Agrostis. But it is so closely allied to D. avenoides, which is an undoubted Deyeuxia, that I have decided to leave it in that genus.
7. D. Petriei, Hack., in Trans. N.Z. Inst. xxxv. (1903) 380 (sub. Calamagrostis).—Culms slender, erect, terete, 1–3 ft. high, glabrous, 3-noded, uppermost node near the middle of the culm. Leaves much shorter than the culms, about ⅛ in. broad, flat, rather flaccid, smooth or scaberulous on the upper surface; sheaths terete, close, scaberulous; ligules oblong, obtuse. Panicle 3–6 in. long, narrow but not very dense; rhachis smooth; branches short, binate or ternate, the lowermost often distant, short, erect, sparingly divided; pedicels shorter than the spikelets, smooth. Spikelets ¼–⅓ in. long, pale-green. Two outer glumes subequal, narrow-lanceolate, acute, rigidly membranous, 1-nerved, scabrid on the keel; 3rd or flowering glume about ⅙ shorter, lanceolate, subacute, minutely denticulate at the tip, firm but membranous, scabro-punctate on the back, callus with silky hairs ⅓ the length of the glume; awn inserted about the middle of the back, straight, equalling the empty glumes or rarely exceeding them. Palea almost as long as the flowering glume,
