An added difficulty in botany', wrote Pliny some nineteen hundred years ago, 'is the variety of names given to the same plant in different districts.' The more 'strange' the herb, the more noteworthy its characteristics, the greater the number of folk-names. Dioscorides, for instance, gives some two-score names to the Mandrake, that famous aphrodisiac with which Leah purchased a night of connubial bliss with Jacob (Gen 30:14ff), and whose narcotic properties could not suffice to give poor Othello 'that sweet sleep which thou owedst yesterday'. \r\nUntil comparatively recently, botanists lacked adequate methods of classification, so that plants tended to be grouped together on the basis of what we nowadays would consider secondary characteristics. Thus speaking of the Ground-pine, Pliny records that 'a third variety has the same smell and therefore the same name.' Even now, the inexactitude of local plant names is the despair of field botanists. Pliny felt as sorely frustrated: 'The reason why more herbs are not familiar,' he writes, 'is because experience of them is confined to illiterate country-folk, who form the only class of people living among them. Moreover, when crowds of medical men are to be met everywhere, nobody wants to look for them. Many simples, also, lack names, though their properties are known...The most disgraceful reason for this scanty knowledge is that even those who possess it refuse to teach it, just as though they would themselves lose what they have imparted to others.

• classification
• plants
• experience
• knowledge
• herbology
• education
• reason
• sleep
• poor