trifoliate orange: small fast-growing spiny deciduous Chinese orange tree bearing sweetly scented flowers and decorative but inedible fruit: used as a stock in grafting and for hedges
vascular plant: green plant having a vascular system: ferns, gymnosperms, angiosperms
phlegm: expectorated matter; saliva mixed with discharges from the respiratory passages; in ancient and medieval physiology it was believed to cause sluggishness