dogtail cacti growing on the trunk of a tree, with cereus cacti and trees, lining a path in koko crater botanical garden,

horticulture conservation selenicereus environment sylindrical dendrology botanical landscape exploring honolulu columnar outdoors epiphyte dogtail growing america texture twisted testudo tourism therapy cereus lining crater garden hawaii hiking botany nature spines ridged cactus spring united states travel cacti trunk trees oxide trail green short sight tree path koko oahu dirt iron tail usa red dog