ation um ▁Color ad ens ium ▁( 1 9 0 5 – 1 9 0 8 ; ▁with ▁Freder ic ▁Clement s ; ▁issued ▁in ▁print ▁in ▁ 1 9 7 2 ) ▁Her bar ia ▁Form ation um ▁Color ad ens ium ▁( 1 9 0 3 ; ▁with ▁Freder ic ▁Clement s ) ▁ ▁References ▁ ▁Category : 1 8 7 4 ▁birth s ▁Category : 1 9 7 1 ▁death s ▁Category : American ▁botan ists ▁Category : American ▁e colog ists ▁Category : Univers ity ▁of ▁Neb r aska ▁al umn i ▁Category : Pe ople ▁from ▁Alb any , ▁New ▁York ▁Category : B ot an ical ▁ill ust rat ors ▁Category : American ▁mem oir ists ▁Category : 2 0 th - century ▁American ▁women ▁scient ists ▁Category : 2 0 th - century ▁American ▁scient ists ▁Category : S cient ists ▁from ▁New ▁York ▁( state ) ▁Category : W omen ▁mem oir ists <0x0A> </s> ▁C ress ida ▁Cow ell ▁( born ▁ 1 5 ▁April ▁ 1 9 6 6 ) ▁is ▁an ▁English ▁children ' s ▁author , ▁popular ly ▁known ▁for ▁the ▁book ▁series , ▁How ▁to ▁Train ▁Your ▁Dragon , ▁which ▁has ▁subsequently ▁become ▁an ▁award - win ning ▁franch ise ▁as ▁adapted ▁for ▁the ▁screen ▁by ▁Dream Work s ▁An imation . ▁As ▁of ▁ 2 0 1 5 , ▁the ▁series ▁has ▁sold ▁more ▁than ▁seven ▁million ▁copies ▁around ▁the ▁world . ▁ ▁In ▁addition ▁to ▁her ▁other ▁publications