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Lesson2Lesson2TheClassificationofHorticulturalPlantsObjectivesoftoday’slectureLearnsomecommontermsusedtogroupplantsLearnthescientificprotocolsusedtonameplantssotheycanbeuniversallyrecognizedLearnabouttheterminologyusedtodistinguishplantswithinaspeciesCategorizingplantsisanancientpracticeTheGreekphilosopherTheophrastus(377-288B.C.)publishedthefirsthorticulturetextbook“HistoriaPlantarum”.Inthistext,plantsaregroupedtogetherbasedonlifespan,growthhabit,retentionofleaves,andothertraitsManyofthesecharacteristicsarestillusedtoclassifyplantsCategorizingplantsThousandsofplantsareusedtodayinvariousareasofhorticultureConvenienttogroupplantstogetherbasedoncommoncharacteristicsLifecycleGrowthhabitEnvironmentaladaptationEnduseorfunctionClassificationbasedonlifecycleAnnualsPlantsthatcompletetheirlifecycle(fromseedtoseed)in1year,e.g.(=exempligratia)petunia,peaspetuniaPeaflowerBiennialsPlantsthatrequireallorpartoftwogrowingseasons;vegetativegrowthinthefirstyear,followedbyoverwintering(lowtemperature);biennialsflowerinthesecondgrowingseason,e.g.hollyhocks,carrotClassificationbasedonlifecycleHollyhocks蜀葵CarrotperennialsPlantsthatpersistformorethantwoseasonsanddonotdieafterflowering,e.g.maple,forsythia,tulips,daylilyClassificationbasedonlifecycleMapleForsythiatulipsDaylilyNotethatmanybiennialsandperennialsaregrownasannualsRootcropssuchascarrotsandbeetsaregrownandharvestedinoneseasonbeforetheyflowerTomatoesandpoinsettiasaregrownintheUSasannuals,butinS.AmericatheygrowasperennialsClassificationbasedonlifecyclePoinsettiasClassificationbasedongrowthhabitNormallyappliedtoperennialplantsWoodyplantsHavepersistentvegetativestructure,e.g.treesandshrubsHerbaceousperennialsDonothavewoodystructureandvegetationdoesnotpersist,e.g.daylily,hostaClassificationbasedongrowthhabitVinesClimbingortrailingplantsthatrequiresupport,e.g.grapes,wisteria(柴藤),clematis(铁线莲)ClassificationbasedongrowthhabitClassificationbasedongrowthhabitDeciduousplantsSh...