1 . ▁Man ual ▁of ▁v asc ular ▁plants ▁of ▁n ort he astern ▁United ▁States ▁and ▁adjacent ▁Canada , ▁ed . ▁ 2 . ▁God f rey , ▁R . ▁K . ▁& ▁J . ▁W . ▁W oot en . ▁ 1 9 7 9 – 1 9 8 1 . ▁Aqu atic ▁and ▁wet land ▁plants ▁of ▁sout he astern ▁United ▁States , ▁ 2 ▁vol . ▁Mat hew , ▁B . ▁ 1 9 8 1 . ▁The ▁I ris . ▁ 1 0 7 . ▁Moh len bro ck , ▁R . ▁H . ▁& ▁D . ▁M . ▁L add . ▁ 1 9 7 8 . ▁Distribution ▁of ▁Illinois ▁v asc ular ▁plants . ▁Thomas , ▁R . ▁D . ▁& ▁C . ▁M . ▁Allen . ▁ 1 9 9 3 – . ▁Atlas ▁of ▁the ▁v asc ular ▁fl ora ▁of ▁Louisiana . ▁W under lin , ▁R . ▁& ▁B . ▁Hans en . ▁Atlas ▁of ▁Florida ▁v asc ular ▁plants ▁( on - line ▁resource ). ▁W under lin , ▁R . ▁P . ▁ 1 9 9 8 . ▁Guide ▁to ▁the ▁v asc ular ▁plants ▁of ▁Florida . ▁Y at skie v ych , ▁G . ▁ 1 9 9 9 – . ▁Ste y erm ark ' s ▁Flora ▁of ▁Missouri , ▁re vised ▁edition . ▁ ▁External ▁links ▁ ▁ful va ▁Category : Pl ants ▁described ▁in ▁ 1 8 1 2 ▁Category : Fl ora ▁of ▁the