Agrostis preissii Vickery,
Contr. New South Wales Natl Herb. 1: 111-112 (1941).
Agrostis preissii Vickery,
Contr. New South Wales Natl Herb. 1: 111-112 (1941).
Lachnagrostis preissii Nees in Lehm., Pl. Preiss. 2: 97 (1846);
Deyeuxia forsteri var. preissii (Nees) Benth., Fl. Austral. 7:
579 (1878); Deyeuxuia preissii Nees ex Index Kew 470 (1893). T: In
regionibus interioribus Australiae meridionale-occidentalis, W.A., Oct. 1840,
Preiss 1846; T: K, BM.
Agrostis solandri F.Muell., Veg.
Chatham-Isl. 60 (1864) p.p.
Vegetative form. Annual, erect or geniculate, caespitose. Culms 12-45 cm high, slender, c. 4 noded. Mid-culm nodes glabrous, exposed or hidden by the leaf sheaths (the internodes shorter or longer than the sheaths). Mid-culm internodes glabrous or scabrous. Leaves non-auriculate. Basal leaf sheaths not keeled, terete, glabrous or scabrous (between the veins), with the veins equally striate. Ligule 3-6 mm long, membranous, acute. Leaf blades folded, setaceous, 20-120 mm long; adaxially glabrous or adaxially scabrous; abaxially glabrous or abaxially scabrous; with margins scabrous, apices acuminose (i.e. long attenuate); convolute in bud.
Reproductive organization. Plants bisexual. Incomplete spikelets absent. Inflorescence of chasmogamous spikelets.
Inflorescence. Inflorescence a panicle, pallid or green, loosely contracted, oblong to ovate, symmetrical. Rachides 40-150 mm long, scabrous. Primary inflorescence branches scabrous, narrowly spreading, filiform.
Hermaphrodite (`perfect') spikelets. Hermaphrodite spikelets pedicellate, 4-4.5 mm long, laterally compressed, not disarticulating as a separate unit, disarticulating above the glumes. Pedicels slender, scabrous. Glumes two per spikelet, diverging from the spikelets, dissimilar, unequal in length, exceeding the florets, longer than the proximal lemma. Lower glume longer than the upper glume, membranous, keeled (especially in upper part), acuminate, muticous; 1 veined, midvein scabrous; intercostal regions glabrous, or intercostal regions scaberulous. Upper glume membranous, keeled (especially in the upper part), acuminate, muticous; 1 veined, midvein scabrous; intercostal regions glabrous, or intercostal regions scaberulous. Rudimentary florets absent. Incomplete florets absent. Hermaphrodite florets 1 per spikelet. Rachilla silky (?), apically prolonged. Callus present, blunt, silky (?). Lemma less firm than the glumes, laterally compressed, ovate, membranous, not keeled, truncate, dentate, 4 -lobed; awned. Lemma 5 veined. Lemma veins prominent (above ?); intercostal regions villous, the hairs over the entire dorsal surface. Awns 1, median. Median awn much longer than the body of the lemmas (c. twice the glume length), 1 veined, dorsal; arising from the mid-point of the lemma (or above), geniculate. Palea thinner than the lemmas (?), membranous, shortly bifid. Lodicules 2, hyaline, ovate. Stamens 3. Anthers c. 0.3 mm long. Ovary glabrous. Styles 2, free to their bases.
Fruit. Fruit elliptical, glabrous.
Distribution. Endemic. Western Australia.
Classification. Pooideae; Poodae; Aveneae.
References. Morphology: Vickery, Contr. N.S.W. Natl Herb. 1: 111-112 (1941).
Cite this publication as:
C.M. Weiller, M.J.
Henwood, J. Lenz and L. Watson (1995 onwards). `Pooideae (Poaceae) in
Australia - Descriptions and Illustrations'. URL
http://muse.bio.cornell.edu/delta/
Dallwitz
(1980) and Dallwitz, Paine and Zurcher (1993)
should also be cited.