Ecology of alfombrilla.
Alfombrilla (Drymaria arenarioides) is a poisonous plant that has caused severe damage to the cattle industry in Chihuahua, Mexico, and is a potential problem in the USA. It is well adapted to soils and climates within the Bouteloua-Aristida type. Results are given of field and laboratory studies carried out under a joint Mexico-US research programme. Germination of freshly harvested seed was less than 5% but was over 75% for 20-month old seed. Optimum temp. for germination was 18-21 deg C; vegetative growth was greater under alternating day/night temps of 26 deg and 15 deg C than at 32 deg and 21 deg . Under field conditions, D. arenarioides was a strong competitor in the habitat, especially before and after the growing seasons of other plants.