Rytidosperma thomsonii (Buchanan) Connor & Edgar
≡Danthonia thomsonii Buchanan Indig. Grasses N.Z. t. 36 (2) (1879)
≡Triodia thomsonii (Buchanan) Petrie, T.N.Z.I. 44: 188 (1912)
≡Notodanthonia thomsonii (Buchanan) Zotov, N.Z. J. Bot. 1: 112 (1963);
Holotype: WELT 59624 (Buchanan's folio)! D. Petrie Mount St Bathans, Otago, 1000-2000 ft.
Variable in size and habit, from low-growing tussocks to moderately tall tufts, rather dull green, ± shortly rhizomatous; leaves semi-pungent, usually » culms; branching intravaginal, shoots crowded, ± swollen at base. Leaf-sheath pale to greyish, glabrous, sometimes with scattered long hairs; apical tuft of hairs 1-3 mm. Ligule c. 0.3 mm. Leaf-blade to 15-(22) cm, stiff, inrolled with scabrid margins, glabrous, or with scattered long hairs. Culm to 45 cm, internodes smooth but minutely scabrid below inflorescence. Panicle strict, to 6.5 cm, shortly branched below, of few to many spikelets on short pedicels; rachis and pedicels closely short-scabrid, with numerous minute hairs interspersed, longer hairs below spikelets and at branch axils. Spikelets 5-8-flowered, sometimes upper florets exceeding glumes. Glumes purplish centrally, ovate-lanceolate, subacute, (3.5)-5-7-(9) mm, ± equal; lower 5-(7)-nerved, upper 3-(5)-nerved. Lemma 2.5-3.5-(4) mm, finely 7-(9)-nerved, both rows of hairs reduced to short dense marginal tufts, elsewhere glabrous, upper hairs < lemma lobes; lobes reduced to minute bristles, 0.1-0.4-(0.6) mm, rarely almost wanting; central awn (0.2)-0.5-1-(2.5) mm, straight, erect, fine, or reduced to a mucro from a bifid lemma-tip, column absent. Palea 2.3-3 mm, ≤ base of sinus, » upper lemma hairs, interkeel and margins glabrous. Callus 0.2-0.3 mm, thick marginal hair tufts reaching base of lower marginal lemma tufts. Rachilla c. 0.5 mm. Anthers 0.4-0.7 mm. Caryopsis 1-1.3 × 0.4-0.7 mm; embryo to 0.5 mm; hilum c. 0.2 mm. Plate 12G.
S.: east of the Main Divide especially in inland basins of Canterbury and Otago. Grassland in dry lowland and montane zones.
Endemic.
