Plant / Beast shape question

[Xavram5]

Plant/Beast shape give you different powers/abilities at the different levels, as well as larger shapes you can change into.

But if you had say, Plant Shape III, could you use it to turn into a Large Plant (which is Plant Shape II) but still get the Damage Reduction, Regeneration, and Trample abilities of Plant Shape III?

The spells read...

Plant Shape II
School transmutation (polymorph); Level alchemist 6, sorcerer/wizard 6

DESCRIPTION

This spell functions as plant shape I except that it also allows you to assume the form of a Large creature of the plant type. If the creature has immunity or resistance to any elements, you gain energy resistance 20 to those elements. If the creature has vulnerabilty to an element, you gain that vulnerabilty.

Large plant: If the form you take is that of a Large plant, you gain a +4 size bonus to your Strength, a +2 size bonus to your Constitution, and a +4 natural armor bonus.

Plant Shape III
School transmutation (polymorph); Level sorcerer/wizard 7

DESCRIPTION

This spell functions as plant shape II except that it also allows you to assume the form of a Huge creature of the plant type. If the form you assume has any of the following abilities, you gain the listed ability: Damage Reduction, regeneration 5, and trample.

Huge plant: If the form you take is that of a Huge plant, you gain a +8 size bonus to your Strength, a -2 penalty to your Dexterity, a +4 size bonus to your Constitution, and a +6 natural armor bonus.

It the line that says, "...the form of a Huge creature of the plant type. If the form you assume has any of the following abilities, you gain blah blah blah".

So if there's a Large Plant with Regeneration/DR, do you gain those abilities via Plant Shape III, even though you're going Large instead of Huge?

[WagnerSika]

Yes you do. The "If the form you assume" part of the ability is not restricted to the size of the form, otherwise it would say something like "if you assume a Huge form you gain following abilities"

[Ryze Kuja]

That is correct. If you use Plant Shape III to turn into a Large Plant, and the particular plant that you choose has DR, regen, or trample, then you would also get these abilities, but since you've chosen to become Large rather than Huge you would only gain a "+4 size bonus to your Strength, a +2 size bonus to your Constitution, and a +4 natural armor bonus" per Plant Shape II due to "This spell functions as plant shape II except" from the Plant Shape III text.

[Xavram5]

Thank you!