sansevieria: grown as a houseplant for its mottled fleshy sword-shaped leaves or as a source of fiber
agave: tropical American plants with basal rosettes of fibrous sword-shaped leaves and flowers in tall spikes; some cultivated for ornament or for fiber
incompatibility: (immunology) the degree to which the body's immune system will try to reject foreign material (as transfused blood or transplanted tissue)