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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 napensis
HABIT Perennial; caespitose; clumped densely. Culms 20–60 cm long. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths open for most of their length. Ligule an eciliate membrane; 1 mm long; acute. Leaf-blades filiform; involute; 20–30 cm long; 1.5–2.5 mm wide. Leaf-blade surface scabrous.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; lanceolate; 3–8 cm long. Panicle branches smooth.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 2–4 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 6–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3 mm long; 0.85 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume apex acute. Upper glume elliptic; 3.5 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
FLORETS Fertile lemma ovate; elliptic in profile; 4 mm long; membranous; keeled; 5 -veined. Lemma surface scaberulous, or scabrous; pubescent; hairy on veins. Lemma apex acute. Palea 1 length of lemma. Palea keels ciliolate; adorned above. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 2; membranous. Anthers 3.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform.
DISTRIBUTION North America: southwest USA.
NOTES Poeae. Man Gr US 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.