资源描述：
《十字花科Brassicaceae》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、十字花科Brassicaceae1-FloralformulaHereisthefloralfortheBrassicaceae.Theflowersareusuallyperfect.Thereare4sepals,4petals,6(SIX!)stamensthataretetradynamous,andasyncarpousgynoeciumof2carpels.2-IntroductionTheBrassicaceae(orCruciferae)isfoundnearlyworldwide,butisparticularlydiversei
2、ntemperateandcoolregionsoftheNorthernHemisphere,intheMediterraneanregion,andinsouthwesternandcentralAsia.3-Cross-likeflowersTheBrassicaceaeoftenhas"cross-like"flowerswith4petals.Thetraditionalnameforthisfamily,Cruciferae,referstothiskindofflower.4-BrassicahabitAlmostallmembers
3、oftheBrassicaceaeareherbaceousplants(annual,biennial,orperennial).Theleavesareoftenpinnatelylobedorcompound.Manyhavemustardoilglucosides.Thisisafieldofcanola(Brassicarapa)growinginMasonCounty,Illinois.5-BrassicaracemesTheinflorescencetypeintheBrassicaceaeisusuallyabractlessrac
4、eme.Thisiscanola(Brassicarapa)growinginMasonCounty,Illinois.6-Brassicaflowersl.s.FlowerofBrassicarapawithonesepal,2petals,and2stamensremoved.Thecompleteflowerhas4distinctsepals,4distinctpetals,6stamens(tetradynamouswith4longand2short),andasyncarpousgynoeciumof2carpelsandasuper
5、iorovary.Thisexampleiscanola(Brassicarapa).7-DevelopingfruitsDevelopingfruitsofHesperismatronalis,Dame'srocket.Theselongandsleekfruitsaresiliques,whichdehisceintotwoparts,leavingareplumbehind(notshown).8-ExplodedflowerAn"exploded"flowerofBarbareavulgaris,Wintercress.9-Cardamin
6、eAracemeofCardaminebulbosa,Bittercress,withflowersatthetopanddevelopingSILIQUESbelow.10-CapsellaAracemeofCapsellabursa-pastoris,Shepherd'spurse,withflowersatthetopanddevelopingSILICLESbelow.11-LepidiumAracemeofLepidiumcampestre,Peppergrass,withflowersatthetopanddevelopingSILIC
7、LESbelow.12-BrassicaoleraceaAfieldofbroccolithathasgonetoflower.ThespeciesBrassicaoleraceahasgivenrisetomanyvegetablecrops:broccoli,cabbage,cauliflower,Brusselssprouts,andkale.13-BrassicaoleraceaYoungcabbages,anothertypeofBrassicaoleracea,plantedinagardenatCarter'sPlantation,n
8、earWilliamsburg,Virginia.
