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Descriptions

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

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

Pseudoraphis brunoniana

HABIT Perennial; mat forming. Stolons present. Culms prostrate; 15–30 cm long; rooting from lower nodes. Culm-nodes pubescent. Ligule a ciliolate membrane. Leaf-blades floating; 4–6 cm long; 2–4 mm wide. Leaf-blade surface scaberulous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 15–20; borne along a central axis; ascending, or spreading; 2.5–3 cm long; bearing 1 spikelet, or few fertile spikelets; bearing 1–3 fertile spikelets on each. Central inflorescence axis 5–12 cm long. Rhachis angular; scabrous on margins; terminating in a barren extension; extension bristle-like; extension 10–15 mm long. Spikelet packing abaxial.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 8–10 mm long; falling entire.

GLUMES Glumes dissimilar; exceeding apex of florets; thinner than fertile lemma. Lower glume oblate; 1 mm long; 0.1 length of spikelet; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume elliptic; 1 length of spikelet; membranous; without keels; 7–9 -veined. Upper glume surface scabrous. Upper glume margins eciliate, or ciliolate. Upper glume apex attenuate; awned; 1 -awned. Upper glume awn 1–10 mm long.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret elliptic; 7–8 mm long; 0.8 length of spikelet; membranous; attenuate; awned. Awn of lower sterile floret 1–5 mm long. Palea of lower sterile floret 0.5 length of lemma. Fertile lemma oblong; 2.5–3 mm long; cartilaginous; without keel. Lemma margins flat. Lemma apex acute. Palea 1 length of lemma; cartilaginous; without keels.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp; ovoid; 1.5 mm long.

DISTRIBUTION Asia-temperate: China and eastern Asia. Asia-tropical: India, Indo-China, and Papuasia.

NOTES Paniceae. Fl Assam 1993.

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