Anatomical anomalies in crop formation plants [crop circles]

acorus calamus avena sativa calor cell walls chaleur crecimiento croissance crops cultivos desarrollo embrionario embryonic development germination glycine max graine gramineas graminee grasses growth heat hordeum vulgare nodes noeud nudos pared celular paroi cellulaire plante de culture seeds semilla stems tallo tige triticum aestivum zea mays