We value your privacy

We use cookies and other technologies to enhance your experience, analyse site usage, help with reporting, and assist in other ways to improve the website. You can choose to allow cookies and other technologies or decline. Your choice will not affect site functionality.

Volume V (2000) - Flora of New Zealand Gramineae
Copy a link to this page Cite this record

Rytidosperma petrosum Connor & Edgar

R. petrosum Connor et Edgar, N.Z. J. Bot. 17: 317 (1979)

; Holotype: CHR 273105! A. P. Druce Cape Palliser, Wairarapa, 100 ft, cliff, Dec. 1973.

Stiff, wiry, small tussocks, tufts formed at ends of elongating shoots, rooting at nodes; leaves ≤ culms, semi-pungent, disarticulating at ligule; branching intravaginal. Leaf-sheath glabrous, light grey to dark brown; apical tuft of hairs 1-1.5 mm. Ligule c. 0.5 mm. Leaf-blade to 15 cm, glabrous, stiff, inrolled, margins glabrous. Culm to 40 cm, internodes glabrous. Raceme or racemose panicle small, erect, to 4 cm, of very few large spikelets on short pedicels; rachis and pedicels almost glabrous with only a few scattered teeth and usually small tufts of long hairs at branch axils. Spikelets 4-6-flowered, awns and sometimes lemma lobes exserted from glumes. Glumes green, lanceolate, acute, 8.5-15 mm, ± equal; lower 5-(7)-nerved, upper 3-nerved. Lemma 2.5-3.5 mm, 9-nerved, upper row of hairs inter-rupted, dense marginal tufts and a few additional hairs adjacent, hairs « lemma lobes, lower row almost continuous, with dense strong marginal tufts and less dense tufts between, overlapping upper, glabrous elsewhere; lobes 4.5-8 mm, narrowing to strong awn and often shortly lobed at awn base; central awn 7.5-14 mm, column 2.5-4 mm, > upper lemma hairs. Palea 3.6-6 mm, = or slightly > upper lemma hairs, interkeel glabrous, margins with 1-2 long hairs. Callus 0.7-1 mm, strong marginal hair tufts overlapping lower lemma hairs. Rachilla 0.5-0.6 mm. Anthers 0.7-1.1 and 1.5 mm, yellow. Caryopsis c. 2.5 × 1.0 mm; embryo c. 1.0 mm; hilum 0.5 mm. Plate 11G.

N.: Wellington (Kapiti Id, South Wellington coast); S.: Nelson (Stephens Id, D'Urville Id). Coastal rocks.

Endemic.

Click to go back to the top of the page
Top