upright -
upright in position or posture; "an erect stature"; "erect flower stalks"; "for a dog, an erect tail indicates aggression"; "a column still vertical amid the ruins"; "he sat bolt upright"
erectile filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood; "erectile tissue"; "the penis is an erectile organ"
fastigiate having clusters of erect branches (often appearing to form a single column)
orthostatic pertaining to an upright standing posture; "orthostatic hypotension"
passant in walking position with right foreleg raised
rearing,
rampant (of a plant) having a lush and unchecked growth; "a rampant growth of weeds"