The llano alto grasslands and savannas are characterized by grasses and shrubs 30–100 cm high, forming tussocks 10 to 30 cm apart. Soils are typically sandy and nutrient-poor. Llano alto covers approximately two-thirds of the Venezuelan llanos, and is also widespread in the Colombian llanos. Grasses of genus "Trachypogon" are predominant, and species include "Trachypogon plumosus, T. vestitus, Axonopus canescens, A. anceps, Andropogon selloanus, Aristida" spp., "Leptocoryphium lanatum, Paspalum carinatum, Sporobolus indicus", and "S. cubensis", and sedges in the genera "Rhynchospora" and "Bulbostylis". Shrubs and herbs are most commonly legumes in the genera "Mimosa, Cassia, Desmodium, Eriosema, Galactia, Indigofera, Phaseolus, Stylosanthes, Tephrosia", and "Zornia". The trees manteco ("Byrsonima crassifolia"), chaparro ("Curatella americana"), and alcornoque ("Bowdichia virgilioides") are the most common, growing either as scattered trees or in woodland patches known as "matas" which range in area from 12 meters in diameter up to a hectare.