lecture #11- Basal Angiosperms Flashcards
When were the earliest angiosperm fossils found?
130MYA
What are Gigantopterids?
They could be the common ancestor of the Angiosperms and Gnetales
- have primitive vessels
- Eusteles
- thought to be a seed fern by some
How would Gigantopterids help Darwins mystery?
The abominable mystery, gigantopterids would help like the “sudden appearance of angiosperms”
-have morphological similarities but molecularly not similar
Did basal angiosperms have flowers?
No, not what we would consider flowers
What is a carpel?
The female reproductive untie of angiosperms
-derived from a leaf
What was characteristics about carpels when they were first invented?
They were imperfectly fused
Where are the ovaries in a carpel?
In the bottom part
What is a fruit?
Matured ovary that contains the seed
What kind of pollen did early anglos have?
Pollen grains with one pore
-monocolpate
What was the purpose of the pore of the pollen?
Pore is where the pollen would germinate
What kind of pollen do more advanced anglos have?
Pollen grains with 3 pores
- tricolpate
- 127MYA
What were the 2 competing hypotheses for the origin of angios based on morphology?
- Paleoherb
2. Woody Magnolid
What is the Paleoherb hypothesis?
Suggests the earliest angios were a groups of tropical flowering plants with uncomplicated flower
-mix of monocot and dicot features
What is a Paleoherb?
Polyphyletic group of non-woody basal angiosperms
What is the Woody Magnolid Hypothesis?
Suggests that early angios had a morphology similar to loving members of the the Magnolids and Lavales
- plants had medium sized trees awith long branched leaves and large flowers
- carpel imperfectly fused
- was the closest hypothesis
