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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 douglasii
HABIT Perennial. Rhizomes elongated. Butt sheaths papery. Culms geniculately ascending, or decumbent; 15–30 cm long. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; truncate. Leaf-blades filiform; involute; 5–15 cm long; 1 mm wide.
INFLORESCENCE Dioecious. Inflorescence a panicle.
Panicle contracted, or spiciform; oblong, or ovate; 2–5 cm long; 1–2 cm wide. Panicle branches scabrous.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 5 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 6–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus woolly.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 4–6 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume apex acute. Upper glume ovate; 4–6 mm long; 0.66–0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
FLORETS Fertile florets female. Fertile lemma ovate; elliptic in profile; 6–7 mm long; membranous; keeled; 5–7 -veined. Lemma midvein scaberulous (above); pubescent; hairy below. Lemma surface pubescent; hairy on veins. Lemma margins pubescent. Lemma apex acute. Palea 1 length of lemma. Palea keels ciliolate; adorned all along. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 2; membranous. Anthers 3.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform.
MALE Male inflorescence similar to female. Male spikelets resembling female.
DISTRIBUTION North America: southwest USA.
NOTES Poeae. Man US Gr 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.