The first two images are of a ground growing orchid I purchased from a greenhouse. It doesnīt care for my cool climate but is plugging along. In warmer climbs it seems to be quite hardy and is used in landscaping in shopping centers here.
The second is a wild orchid growing near my house (2100m, Western Cordillera, Colombia).
Thank you. I see that Arundina graminifolia is an Asian species.
Other images of Oncidium sphacelatum certainly look like my plant. In a brief look on google I didnīt see Colombia mentioned but it is stated to be in Venzuela close by.