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 above aerial agricultural agriculture appearance arial Australia below buildings country side developed development distance distant expanse farm farm buildings farming farmland farms flat flying formations from above height high landscape lined lines looking down movement moving northern Northern Australia outback panoramic views plantations river riverflats riverland rows rugged rural scenery scenic shadows sightseeing sparse speed sunlight sunshine travel travelling undulating valleys