The chief modifications are the articulation of the deciduous blade on to the sheath, which occurs in all the Bambuseae (except Planotia) and in Spartina stricta; and the interposition of a petiole between the sheath and the blade, as in bamboos, Leptaspis, Pharus, Pariana, Lophatherum and others.
Some species, such as Poa stricta, are known only in this viviparous condition; others, like our British species Festuca ovina, and Poa alpina, become viviparous under the special climatic. conditions.
Nardus stricta (matweed), found on heaths and dry pastures, is a small perennial with slender rigid stem and leaves, it is a useless grass, crowding out better sorts.
It is now filled with the smooth sumach (Rhus glabra), and one of the earliest species of goldenrod (Solidago stricta) grows there luxuriantly.