文档介绍：植物界分类检索表及种子植物分科检索表一、、茎、叶的分化;雌性***官由单细胞构成。.....................................................................1)......................................................................2)................................................................................................3)、茎、叶分化(苔藓除外);雌性***官由多细胞构成。.................................................................................................4)...................................................................................................5).........................................................................6).........................................................................7)被子植物二、,不包于子房内;种子裸露,不包于果实内.......…...…....…..,胚珠无细长的珠被管。,集生于常不分枝的树干顶部或块状茎上.......…,树干多分枝。,具多数2叉状细脉,叶柄长..........................……...,无柄或有短柄。;种子无肉质假种皮。,稀同株,雄蕊具4~20个悬垂的花药,苞鳞腹面仅l粒种子.......…….................................................................,稀异株;雄蕊具2~9个背腹面排列的花药,种鳞腹面有1至多粒种子。,每种鳞具2粒种子..........................;每种鳞具1至多粒种子。,稀交互对生(水杉属),每种鳞有2~9粒种子....................................................................………….;每种鳞有1至多粒种子…….....…....….....................................................................…………;种子有肉质假种皮。;胚珠倒生或半倒生......................-8个花药;胚珠直生。,种子核果状.............................,种子坚果状或核果状.......…….;胚珠珠被顶端伸长成细长的珠被管。;球花短缩,具交互对生或轮生的苞片........;球花伸长成细长穗状,具多轮环状总苞..;种子包被于子房内............................…;叶具网状脉;花常为5或4基数......................................................................