If you are unable to observe
a plant in situ, you may be able to infer whether elongate stems
were creeping along the substrate; roots at nodes near a stem's apexapex:
(n) the point farthest from the point of attachment; the tip (often pointed)
may
indicate the plant had a creeping habit.
Note that stems floating on or near the water surface or in mid-water, may be erect, ascending, or creeping horizontally.