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New Species of Gramineae from south-eastern Queensland

1982; Volume: 1; Issue: 5 Linguagem: Inglês

10.5962/p.364248

2653-0139

Brian Simon,

Ecology and Vegetation Dynamics Studies

Summary The following 8 species of Gramineae from south-eastern Queensland are described as new: Bothriochloa bunyensis, Dichanthium queenslandicum, Sporobolus laxus, x Cynochloris reynoldsensis, Dichelachne parva, Arundinella grevillensis, Paspalidium grandispiculatum and Eragrostis longipedicellata. During the course of preparation of A Key to Queensland Grasses (Simon, 1980) a number of undescribed species were referred to in the key by reference to individual specimens. As the Gramineae account for the forthcoming Flora of South-Eastern Queensland is to be written up soon it was thought opportune to formally describe these species for inclusion in the flora account. Bothriochloa bunyensis B. K. Simon, species nova aflinis B. bilobae S. T. Blake sed internodiis rachidis longioribus, pilis calli, internodiorum rachidis et pedicelli brevioribus, rhizomatibus differi. Typus: Queensland, Bunya Mountains, Simon 3530 (BRI256874, holotypus; isotypi, AD, B, BRI, CANB, K, L, MEL, MO, NSW, NT, PERTH, PRE). Perennial to 60 cm tall with thin, many-noded rhizomes. Culms solitary, geniculately ascending to erect, glabrous, smooth, 2-4-noded, nodes glabrous, deep purple in colour. Leaf sheaths slightly keeled, becoming fibrous at maturity, slightly hairy, with the hairs thicker at the margins and arising from tubercled bases. Ligule membranous with a shortly ciliolate fringe, to 1 mm long. Leaf blades linear to 1 2 cm long, with an acuminate apex, flattened with scaberulous margins and apices. Inflorescence digitate to subdigitate with 2-4 pedunculate stiffly spreading racemes which are 5-12-jointed and 5-10 cm long. Spikelet pairs heterogamous, the pedicelled spikelet reduced to a long inrolled lower glume. Rhachis internodes and pedicels 7-8 mm long, linear, filiform, finely furrowed throughout most of their lengths, with ciliate margins. Sessile spikelet 8-9 mm x 1 .7-2 mm, dorsally compressed; callus oblique, scar obtuse ca 0.3 mm in diameter, callus hairs to 3 mm long. Lower glume 2-keeled, with a row of rigid bristles on the keels and flat on the back in the apical 'A, with the margins more rounded and incurved and the back more convex towards the base, crustaceous with hyaline margins, 1 3-nerved between the keels, the back scabrous towards the apex, papillate towards the base. Upper glume slightly smaller than the lower with a cymbiform keel scabrous towards the apex, 3-nerved. Lower lemma about half as long as the glumes, a broad hyaline membrane. Upper lemma linear, 4 mm long, shortly 2-lobed; awn arising from the sinus of the lobes, ca 2 cm long, reddish-brown, stout, scaberulous all over, geniculate, the column and apical portion of about equal length. Palea a short hyaline membrane ca 1 x 1 mm, with a very erose apical margin. Anthers 3, 1.5-2 mm long. Lodicules cuneate, hyaline, ca 1 mm long, with branching nerves. Grain ca 3 x 1 mm, reddish brown, embryo ca 0.4 mm long. Pedicelled spikelet consisting of a subulate lower glume with inrolled scabrous margins, 1 2-1 3 mm long, 7-nerved (Fig. 32).