citrus: any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds
vascular plant: green plant having a vascular system: ferns, gymnosperms, angiosperms
hemp nettle: coarse bristly Eurasian plant with white or reddish flowers and foliage resembling that of a nettle; common as a weed in United States