ley . ▁Ed gar ▁Th ur ston ▁and ▁Ch amb ré ▁C . ▁V ig urs ▁published ▁a ▁supp lement ▁to ▁the ▁fl ora ▁in ▁ 1 9 2 2 ▁and ▁in ▁ 1 9 8 1 ▁L . ▁J . ▁Mar get ts ▁and ▁R . ▁W . ▁David ▁published ▁A ▁Review ▁of ▁the ▁Corn ish ▁Flora . ▁ 1 9 8 0 ▁Pool : ▁Institute ▁of ▁Corn ish ▁Studies ▁. ▁A ▁supp lement ▁to ▁this ▁for ▁ 1 9 8 0 – 1 9 9 1 ▁by ▁Mar get ts ▁and ▁K . ▁L . ▁Sp urg in ▁appeared ▁in ▁ 1 9 9 1 . ▁ ▁Another ▁useful ▁source ▁of ▁botan ical ▁information ▁is ▁The ▁Flow ers ▁of ▁the ▁Field , ▁by ▁C . ▁A . ▁Joh ns ▁( 1 8 5 3 ): ▁it ▁tre ats ▁the ▁country ▁as ▁a ▁whole ▁( with ▁a ▁supp lement ▁on ▁grass es ), ▁but ▁Joh ns ▁was ▁a ▁Corn ish man ▁and ▁very ▁knowledge able ▁about ▁its ▁fl ora ▁and ▁fa una . ▁The ▁Rev ▁Charles ▁Alexander ▁Joh ns , ▁F . L . S . ▁( 1 8 1 1 – 1 9 7 4 ) ▁is ▁also ▁responsible ▁for ▁calling ▁the ▁attention ▁of ▁botan ists ▁to ▁the ▁very ▁special ised ▁fl ora ▁of ▁the ▁L izard ▁in ▁A ▁Week ▁at ▁the ▁L izard , ▁ 1 8 4 8 , ▁written ▁when ▁he ▁was ▁a ▁teacher ▁at ▁Hel ston ▁Gram mar ▁School . ▁ ▁Pl ants ▁of ▁the ▁en vir