A small, single-stemmed tree with trunk-like branches each with a rounded crown of dark green branchlets which leave the stem at right angles and then curve sharply to grow upwards. The branchlets are usually 4-winged constricted into segments. Each bears stout grey spines along its length. It bears greenish-yellow flowers which are produced above the spines. The fruit is a 3-lobed capsule about 7mm in diameter.