abundant angles appearances castor-beans castor-oil castor-oil-plant castor-seeds cluster clusters common cotyledons Euphorbiaceae fast-growing flower flowers foliage highly-toxic inflorescences invasive large large-leaves leaf leaves medicinal palm-of-Christ palma-Christi poison poisonous ricinus-communis seed-pods seedhead shrub shrubbery spiky-green-seed-capsule spiny surface surfaces textured textures toxic toxins vegetation wasteland-weed weed widespread biohazard danger equipment face filter filtering gas gas mask head mask military pictogram pollution protect safe security sign war ailment ash ashtray cancer cigar cigarette cigars coffebreak death dirty drugs health reek smoke smoke glass smoker smoking tobacco unhealty autumn berries berry bush England english Great Britain natural nature red South Downs Sussex Viburnum Wayfaring tree wild Australia Australian cone cycad cycads firm fronds fruit hardy inedible Macrozamia riedlei seed pod Western Australian zamia palms zamias brown durable furry primitive resistant shape temperate texture unusual black