black bryony climber Dioscorea communis Dioscoreaceae heart-shaped leaves natural nature wild berries berry bush green juniper Juniperus communis plant shrub Spain autumn climbing communis England fruits poisonous red Sussex Tamus woodland black bryony danger dangerous deadly fall poison Tamus communis toxic countryside english fruit Great Britain hawthorn ripening Surrey branch clematis hedgerow native plants seedheads traveller's joy winter hanging pendulant 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 medicinal palm-of-Christ palma-Christi ricinus-communis seed-pods seedhead shrubbery spiky-green-seed-capsule spiny surface surfaces textured textures toxins vegetation wasteland-weed weed widespread