十字花科Brassicaceae文档格式.docx

十字花科Brassicaceae文档格式.docx

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）stamensthataretetradynamous,andasyncarpousgynoeciumof2carpels.

2-Introduction

TheBrassicaceae（orCruciferae）isfoundnearlyworldwide,butisparticularlydiverseintemperateandcoolregionsoftheNorthernHemisphere,intheMediterraneanregion,andinsouthwesternandcentralAsia.

3-Cross-likeflowers

TheBrassicaceaeoftenhas"

cross-like"

flowerswith4petals.Thetraditionalnameforthisfamily,Cruciferae,referstothiskindofflower.

4-Brassicahabit

AlmostallmembersoftheBrassicaceaeareherbaceousplants（annual,biennial,orperennial）.Theleavesareoftenpinnatelylobedorcompound.Manyhavemustardoilglucosides.Thisisafieldofcanola（Brassicarapa）growinginMasonCounty,Illinois.

5-Brassicaracemes

TheinflorescencetypeintheBrassicaceaeisusuallyabractlessraceme.Thisiscanola（Brassicarapa）growinginMasonCounty,Illinois.

6-Brassicaflowersl.s.

FlowerofBrassicarapawithonesepal,2petals,and2stamensremoved.Thecompleteflowerhas4distinctsepals,4distinctpetals,6stamens（tetradynamouswith4longand2short）,andasyncarpousgynoeciumof2carpelsandasuperiorovary.Thisexampleiscanola（Brassicarapa）.

7-Developingfruits

DevelopingfruitsofHesperismatronalis,Dame'

srocket.Theselongandsleekfruitsaresiliques,whichdehisceintotwoparts,leavingareplumbehind（notshown）.

8-Explodedflower

An"

exploded"

flowerofBarbareavulgaris,Wintercress.

9-Cardamine

AracemeofCardaminebulbosa,Bittercress,withflowersatthetopanddevelopingSILIQUESbelow.

10-Capsella

AracemeofCapsellabursa-pastoris,Shepherd'

spurse,withflowersatthetopanddevelopingSILICLESbelow.

11-Lepidium

AracemeofLepidiumcampestre,Peppergrass,withflowersatthetopanddevelopingSILICLESbelow.

12-Brassicaoleracea

Afieldofbroccolithathasgonetoflower.ThespeciesBrassicaoleraceahasgivenrisetomanyvegetablecrops:

broccoli,cabbage,cauliflower,Brusselssprouts,andkale.

13-Brassicaoleracea

Youngcabbages,anothertypeofBrassicaoleracea,plantedinagardenatCarter'

sPlantation,nearWilliamsburg,Virginia.