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Descriptions

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

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

Poa porphyroclados

HABIT Perennial; caespitose. Cataphylls evident. Butt sheaths herbaceous; pallid. Basal innovations extravaginal. Culms 45–90 cm long; 1–2 -noded. Culm-internodes terete; smooth. Culm-nodes glabrous. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths scaberulous; glabrous on surface. Ligule an eciliate membrane; 0.5 mm long; scaberulous on abaxial surface; truncate. Leaf-blades filiform; involute; 13–40 cm long; 0.3–0.4 mm wide. Leaf-blade surface smooth; glabrous.

INFLORESCENCE Inflorescence a panicle. Peduncle scaberulous above.

Panicle open; ovate; effuse; 10–22 cm long. Primary panicle branches spreading; 4 -nate. Panicle branches capillary; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 4–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 0.9 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scaberulous. Lower glume apex acute. Upper glume oblong; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex acute.

FLORETS Fertile lemma oblong; elliptic in profile; 3.2–3.75 mm long; membranous; keeled; 5 -veined. Lemma midvein ciliate. Lemma surface pubescent; hairy on veins. Lemma margins eciliate, or ciliate; hairy at base. Lemma apex obtuse. Palea 0.9 length of lemma. Palea keels scaberulous; adorned above. Palea surface smooth, or scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 2.2 mm long; yellow, or purple.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Australasia: Australia.

NOTES Poeae. Vickery.

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