Grass leaf shape

Leaf shape (Fig. 5.5). Leaf shape and size can be very different, from short with distinct barge-shaped leaf ends of the meadow-grasses, to long and twisted in the bromes. Ryegrasses have spear shaped leaves and the bent grasses taper to a sharp point. 

Lig ule.—A membranous appendage at the summit of the leaf-sheath in many grasses and cereals a strap shaped corolla of a Composite. 

Sudan grass is an annual grass with stems up to 9 ft tall that branch from the base. Leaf blades are broad to narrow up to 0.5 in. wide and 12 in. long panicles open. The plant flowers in a 12 in. long, erect, loose panicle that is approximately half as wide as it is tall. It also forms a grass or grain-like glume around seed buds with bristle-shaped tips. 

A further series of hydroxyanthraquinones were isolated by Raistrick at the same time from Helminthosporium species. These organisms are found on cereals and grasses. When Helminthosporium gramineum, the causative organisms of a leaf stripe disease of barley, was grown on a Czapek-Dox medium it imparted a deep-red colour to the medium. Under some conditions the underside of the mycelial mat was partially covered with dark-red needle-shaped crystals. The main constituent was a trihydroxyanthraquinone, helminthosporin (7.8). Its structure was... 

Leaves folded in stem Boat-shaped leaf tips No aurioles Small grass... 

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