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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Greslania rivularis

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 90–350 cm long; 5–15 mm diam.; woody. Culm-internodes terete; hollow; 10–20 cm long; smooth; distally glabrous. Lateral branches lacking, or sparse. Bud complement 1. Leaves 10–26 per branch. Leaf-sheaths longer than adjacent culm internode; smooth; glabrous on surface. Leaf-sheath oral hairs ciliate; curly and deciduous. Ligule an eciliate membrane. Leaf-blade base broadly rounded, or cordate; with a brief petiole-like connection to sheath; petiole 0.2–0.5 cm long. Leaf-blades deciduous at the ligule; lanceolate, or oblong, or ovate; 7–20 cm long; 20–40 mm wide; coriaceous; stiff. Leaf-blade midrib conspicuous. Leaf-blade venation without cross veins. Leaf-blade surface smooth; glabrous. Leaf-blade apex attenuate; filiform.

INFLORESCENCE Synflorescence bractiferous; paniculate; 10–40 cm long; open; with spathaceous subtending bracts (with dwarf blade), or foliaceous subtending bracts (sparsely); bracts 4–10 mm long; without axillary buds at base of spikelet; prophyllate below lateral spikelets.

Fertile spikelets sessile, or pedicelled. Pedicels 0.5–1.5 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets ovate; laterally compressed; compressed slightly; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 2.5–3 mm long; scarious; without keels; 9 -veined. Lower glume surface glabrous. Lower glume apex truncate, or obtuse. Upper glume oblong, or ovate; 4–5 mm long; scarious; without keels; 11 -veined. Upper glume apex truncate, or obtuse.

FLORETS Fertile lemma oblong, or ovate; 5–6 mm long; chartaceous, or coriaceous; without keel; 9 -veined. Lemma surface glabrous; inner surface pubescent (at apex). Lemma apex obtuse; cucullate. Palea 5.5 mm long; 1 length of lemma; coriaceous; 6 -veined. Palea keels approximate. Rhachilla extension 4 mm long.

FLOWER Lodicules 3; glabrous. Anthers 6. Stigmas 3. Ovary umbonate; glabrous.

FRUIT Caryopsis with adherent pericarp; oblong, or ovoid; 4 mm long.

DISTRIBUTION Pacific: southwestern.

NOTES Bambuseae. WDC 2007.

ADDITIONAL CHARACTERS Synflorescence branches straight.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.