Pollen - City

Species - Poaceae


Spring - Fall
Grasses can be annual or perennial plants, usually with the following characteristics (an image gallery can be used as a link): Weed branches, called stems, are usually cylindrical (rarely flat but not triangular) and hollow, to attached nodes to which leaves are attached . The leaves of the grass are almost always alternate and distichous (in the plane), and have the same roots. Each leaf is separated by a lower sheath that surrounds the stem and a leaf with round (ie smooth) edges. The leaves of many grasses are hardened by siliceous phytolites, which discourage grazing animals; others, such as grass swords, can sharply cut human skin. A membranous pendant or fringe of hair called a ligule lies at the junction between the sheath and the leaf and prevents water or insects from entering the sheath. Poaceae flowers have a natural arrangement of spikelets, each with one or more flowers. The spikelets are further grouped into laths or spikes. The part of the spikelet that bears flowers is called the rachilla. The spikelet consists of two (or sometimes smaller) leaves at the base, called plows, followed by one or more flowers. The flower consists of a flower surrounded by two bracts, one on the outside - the lemma - and one on the inside - the floor. The flowers are usually hermaphroditic - corn is the main exception - and are often anemophilic or wind-pollinated, although insects sometimes play a role. The fruiting body shrinks in two scales, called lodicules, which expand and contract to disperse the lemma and palea; these are often translated as modified sepals. The weed fruit is karyopsis, in which the weed seed mixes with the weed wall. The cane of a helmet is more like a leaf branch unlike the first branch made of seed.
Read more about Poaceae at Wikipedia:
Image from Wikipedia