arum: any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe
herb: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
tamarisk: any shrub or small tree of the genus Tamarix having small scalelike or needle-shaped leaves and feathery racemes of small white or pinkish flowers; of mostly coastal areas with saline soil