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Descriptions

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

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

Heteropholis pilosa

HABIT Annual. Culms erect; 25–30 cm long. Culm-nodes pubescent. Lateral branches sparse. Ligule a ciliate membrane; 1 mm long. Leaf-blades 3–6 cm long; 1–3 mm wide.

INFLORESCENCE Inflorescence composed of racemes; subtended by an inflated leaf-sheath; exserted, or embraced at base by subtending leaf. Peduncle 0.2–0.3 cm long; glabrous.

Racemes 1; single; smoothly terete; unilateral; 1–4 cm long; bearing 5–10 fertile spikelets on each. Rhachis fragile at the nodes; subcylindrical and excavated; glabrous on surface. Rhachis internodes columnar; 3–5 mm long. Rhachis internode tip transverse; crateriform; with simple rim.

Spikelets sunken; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels fused to internode; united below; linear; flattened; 3–5 mm long; glabrous; tip rectangular.

STERILE SPIKELETS Companion sterile spikelets represented by single glumes; lanceolate, or ovate; 0.5 mm long; shorter than fertile. Companion sterile spikelet glumes membranous; glabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 2–3.5 mm long; 1.3–2 mm wide; falling entire; deciduous with accessory branch structures. Spikelet callus base truncate; with central peg; attached transversely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume ovate; 1 length of spikelet; indurate; 2-keeled; keeled laterally; 11 -veined. Lower glume lateral veins obscure. Lower glume surface smooth; pilose; hairy in lines. Upper glume ovate; membranous; without keels; 5 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; hyaline. Fertile lemma elliptic; 2–3 mm long; hyaline; without keel.

FLOWER Anthers 3; 1 mm long.

DISTRIBUTION Australasia: Australia.

NOTES Andropogoneae. Simon 1994.

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