| |
[這篇文章最後由光山在 2010/07/21 10:49pm 第 1 次編輯]^
這部份其實不是tcf的內容，和仙人掌型態有關所以也放進來。{m&
http://www.sbs.utexas.edu/mauseth/researchoncacti/Flowers.htm^mmS7
©台灣仙人掌與多肉植物協會 -- 台灣仙人掌與多肉植物協會論壇 '
Although axillary buds produce flowers, they always produce a bit of stem tissue first: the very first appendage primordia are leaf primordia, not sepal primordia. In most cacti, the axillary bud apical meristem actually produces 20 or 30 or more leaf primordia before it actually switches over to producing floral appendage primordia. The noteworthy thing is that these leaf primordia typically develop much more than do other leaf primordia on the same plant, and they mature into large scales that may be a centimeter or more long and have a thin, flat lamina-like region. People typically do not realize that these cactus leaves are true leaves but they are indeed. They are usually called “scales” or “bracts” but that does not matter: they are leaves. The problem is that the ovary is so deeply inferior that these leaves appear to be part of a flower rather than part of a vegetative stem.}Kvo
©台灣仙人掌與多肉植物協會 -- 台灣仙人掌與多肉植物協會論壇 Azu
光山的摘錄：j[{E
仙人掌刺座在生成花的時候，會先生成一小段莖組織，然後先產生葉原體再來則是花瓣原體。所以那些花朵下半部的鱗片，根本就是葉子，只有上半部的有色物體才是真正的花瓣。OknPu
©台灣仙人掌與多肉植物協會 -- 台灣仙人掌與多肉植物協會論壇 ,<VL|
仙人掌的子房屬於子房下位型，而且是超級下位，一般下位子房只會低過花辮，仙人掌的子房根本凹陷到莖的裡面了(前面提到的一小段莖組織)。仙人掌的子房因而被一層莖的組織包圍起來。9
©台灣仙人掌與多肉植物協會 -- 台灣仙人掌與多肉植物協會論壇 tj81
結論：仙人掌的子房被一圈莖組織圍繞著，所以有刺座也有葉子也有刺。mib*
仙人掌的"花"其實是花和莖的混合體。Jx
| | |
|
|
|
按這裡註冊 
頂端 
加到"我的最愛"
主題管理：
總固頂 
短訊息
查看
搜尋
通訊錄
引用
回覆
只看我
此主題相關圖片如下：.P
按此查看圖片詳細資料
2010/07/08 10:48pm 
IP: 已設定保密
