裸子植物门分种检索表

裸子植物门分种检索表

1. 落叶 ···························································2 1常绿 ··························································5

2. 叶扇形，在长枝上螺旋状排列，，短枝上簇生；雌雄异株···············银杏

2. 叶条形，在长枝上螺旋状互生，短枝上簇生；雌雄同株················3

3. 种鳞木质，球果成熟后脱落·······································金钱松 3种鳞革质，宿存··················································4

4. 种鳞上部边缘不反曲；1年生枝色浅，不为红褐色，无白粉············华北落叶松

4. 种鳞上部边缘显著向外反曲；1年生枝红褐色，被白粉················日本落叶松

5. 灌木····························································6

5. 乔木····························································7

6. 匍匐灌木；具二型叶；种子近球形··································叉子圆柏

6. 灌木或小乔木；无二型叶；种子近卵圆形····························杜松

7. 枝无长短枝之分··················································8

7. 枝具长短枝之分··················································17

8. 枝具特化短枝····················································9

8. 枝仅具长枝······················································12

9. 叶3~5针一束；叶内有一条维管束；鳞脊顶生························10

9. 叶2~3针一束；叶内有两条维管束；鳞脊背生························11

10. 叶3针一束；种鳞鳞脊背生，有刺；球果卵圆形，形小···············白皮松

10. 叶5针一束；种鳞鳞脊顶生，无刺；球果卵状圆锥形，较大···········华山松

11. 叶长；鳞脊有刺·················································油松

11. 叶短；鳞脊凹下，无刺···········································樟子松

12. 种鳞脱落；球果腋生，直立；枝上无叶枕···························辽东冷杉

12. 种鳞宿存；球果顶生，下垂；枝上有叶枕···························13

13. 基部宿存芽鳞不反曲·············································青杄

13. 基部宿存芽鳞反曲···············································14

14.1年生嫩枝淡绿黄色，2年生枝淡粉红色····························青海云杉 14.1年生小枝红褐色或黄褐色·······································15

15. 叶先端钝；小枝无白粉···········································白杄

15. 叶先端尖或锐尖·················································16

16.1年生小枝无白粉；球果种鳞露出部平滑无纵纹·····················红皮云杉 16.1年生小枝有白粉；球果种鳞露出部有纵纹·························云杉

17. 球果当年成熟···················································18

17. 球果翌年成熟···················································21

18. 叶鳞与种均为螺旋状互生；叶基部下延；种鳞扁平，苞鳞革质·········杉木

18. 叶鳞与叶均交互对生或轮生；种鳞木质·····························19

19. 叶条形，排成两列；叶基部下延；球果具长梗，两侧有翅·············水杉

19. 叶鳞形或刺形；叶基部不下延；球果具短梗，两侧具窄翅或无翅········20

20. 种鳞木质，背部有勾状尖头；种子无翅·····························侧柏

20. 种鳞革质，顶端具突起小尖头；种子两侧具翅·······················北美香柏

21. 叶基部下延·····················································南洋杉

21. 叶基部不下延···················································22

22. 叶三棱针形；雌雄异株，球花单生枝顶；种翅膜质···················雪松

22. 叶鳞形或刺形；雌雄同株，球花单生枝顶；种子具窄翅或无翅········23

23. 成熟球果的种鳞木质，盾形，熟时张开····························柏木 23成熟球果的种鳞肉质，成浆果状，熟时不张开或微张开··············刺柏