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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 mathewsii

HABIT Perennial; caespitose; clumped loosely. Stolons present. Basal innovations extravaginal. Culms geniculately ascending; slender; 25–50 cm long. Lateral branches lacking. Leaf-sheaths antrorsely scabrous (on margins); glabrous on surface; outer margin hairy. Ligule an eciliate membrane; 0.7–1.5 mm long; scaberulous on abaxial surface; entire; truncate. Leaf-blades 10–17 cm long; 1–2 mm wide. Leaf-blade surface puberulous; hairy adaxially. Leaf-blade margins ciliate; hairy at base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth, or scaberulous above.

Panicle open; ovate; 10–25 cm long. Primary panicle branches spreading. Panicle axis scaberulous. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 3.5–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.5–1 mm long; smooth; glabrous, or sparsely hairy. Floret callus glabrous, or sparsely hairy.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 0.8–1.5 mm long; 0.5–0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume lanceolate; 1.5–2 mm long; 0.66–0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex obtuse.

FLORETS Fertile lemma lanceolate; elliptic in profile; 2–3 mm long; membranous; keeled; 5 -veined. Lemma surface scaberulous; rough above and on veins; glabrous. Lemma apex obtuse. Palea 1.5–2 mm long. Palea keels ciliate; adorned above. Palea surface pubescent; hairy on back.

FLOWER Lodicules 2; 0.2–0.4 mm long; membranous. Anthers 3; 0.3–0.5 mm long.

FRUIT Caryopsis with adherent pericarp; 1 mm long. Hilum punctiform.

DISTRIBUTION Australasia: New Zealand.

NOTES Poeae. Edgar 1995.

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