Australia Australian common cone cycad cycads firm fronds fruit hardy inedible large Macrozamia riedlei poisonous seed pod Western Australian widespread zamia palms zamias brown durable furry primitive resistant shape surface temperate texture textures unusual western australia appearance green painted appearance pineapple-shaped strange ancient backgrounds botanic botany Cycadophyta evergreen feather-shaped firm-fronds frond garden gymnosperms living-fossils natural nature palm-like park pinnate plant prehistoric shade shaded undergrowth ancient-plant burrawang dioecious erect glaucous leaves macrozamia-riedlei pineapple-like-cones seed-cones seed-pods toxic toxins waxy-coating Western-Australian zamia-palms