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The leaves are arranged in whorls of three to six, lanceolate to obovate or elliptic in shape, 60-300 mm (2+1⁄2-12 in) long and 30-130 mm (1+1⁄8-5+1⁄8 in) broad, with an entire or spiny-serrated margin. The flowers are produced in a long, slender, and simple raceme 50-300 mm (2-12 in) long, the individual flowers 10-15 mm (3⁄8-9⁄16 in) long, white to pink or purple, with four tepals. The fruit is a hard, woody, globose follicle with a pointed apex containing one or two seeds. The nutshell ("coat") is particularly tough and requires around 2000 N to crack. The shell material is five times harder than hazelnut shells and has mechanical properties similar to aluminum. It has a Vickers hardness of 35.[8][9]