中国农业大学东校区春季开花植物花器官分类检索表1草本 (2)1 木本 (4)2 雄蕊背部具细管状距···················································紫花地丁2 花不具距 (3)3 头状花序·······························································蒲公英3 总状花序·······························································二月兰4 花瓣合生 (5)4 花瓣离生 (7)5 花瓣颜色为紫色或白色·····················································丁香5 花瓣颜色为黄色 (6)6 花冠通常6裂···························································迎春花6 花冠通常4裂·····························································连翘7 假蝶形花冠 (8)7 非假蝶形花冠 (9)8 单叶互生，心形，全缘（叶缘有增厚的透明边），光滑无毛·····················紫荆8 成下垂的总状花序，叶广卵圆形，先端急尖，基部截形或浅心形，背面有短绒毛，脉上毛较多·································································垂丝紫荆9 花叶同放···································································桃9 花叶不同放 (10)10 先花后叶 (11)10 先叶后花 (17)11 雄蕊和雌蕊均多数，分离，螺旋状排列于柱状花托上 (12)11 无柱状花托 (14)12 花大，花萼、花瓣相似，共9片，纯白色····································玉兰12 花大，花瓣6片，萼片3 (13)13 花瓣外面紫色，里面近白色··············································紫玉兰13 花瓣外面多淡紫色，基部色较深，里面白色······························二乔玉兰14 花单生 (15)14 花簇生 (16)15 萼筒广钟状，长3—5mm,微被毛或无毛···································榆叶梅15 萼筒圆筒状，外面基部被短柔毛···············································杏16 伞房花序································································樱桃16 短总状花序······························································樱花17 花单生，粉红色··························································木瓜17 花簇生 (18)18 萼筒外面无毛或有白色绒毛，萼片三角卵形，比萼筒短或近等长，先端急尖，全缘，外面无毛或偶有稀疏绒毛，内面密被白色绒毛·································海棠花18 萼筒钟状，外面无毛；萼片直立，半圆形稀卵形·························贴梗海棠。