Changes of shoot number and fructification rate of Hemerocallis dumortieri var. esculenta from upper part to lower part on the western slope in Kirigamine heights, central Japan

altitud altitude branching fructification fruiting hemerocallis japan japon plant habit plant response plantas silvestres plante sauvage port de la plante ramification respuesta de la planta sloping land stems tallo terre en pente terreno en declive tige wild plants