Poa annua L. Annual Bluegrass Habit: Tufted, bright green, erect to spreading annual, sometimes rooting at the lower nodes. Culms: 5-20 cm. tall, flattened, usually decumbent and branched at the base or erect, forming mats. Blades: Flat or folded, flaccid, 1-10 cm. long, 1.5-5 mm. wide, boat-shaped at the tip. Sheaths: Loose, overlapping. Ligule: Rounded at the apex, 2-3 mm. long, membranous. Inflorescence: Open, terminal panicle; pyramidal, 3-8 cm. long, the branches spreading. Spikelets: Crowded, 3-5 mm. long; 2-6-flowered, flat, the rachis articulate between the flowers, the uppermost floret imperfect or rudimentary. Glumes: 2, keeled, smooth, the first lanceolate, acute, 1.5-2 mm. long, the second obtuse, 2-2.5 mm. long. Lemma: 2.5-3 mm. long, distinctly 5-nerved, the nerves hairy below, the long hairs on the lower part of the keel sometimes resembling a web. Palea: About 2 mm. long, 2-keeled and 2-nerved, pubescent on nerves. Stamens: Anthers 0.5-1 mm. long. Fruit: Grain, about 1.5 mm. long. Habitat: Waste places, lawns, pastures, openings in woods, and cultivated ground. May-October. Kansas Range: Scattered throughout. Remarks: Objectionable in lawns, leaving unsightly patches when it dies in early summer.