Wednesday, October 6, 2010

Lab 3 - Eurosids I: Fabaceae

 FABACEAE (LEGUMINOSAE) - Legume/Pea family

A variety of beans from the from the Fabaceae family.

A common trait of the Fabaceae family is its compound leaves. This leaf ends with a single leaflet, we call this "odd-pinnate" leaf.

...and what is odd without even
An "even-pinnate" leaf ends with 2 opposite leaflets...

and sometimes with some tendrils as well.

Halfway down the page is a labeled picture of a compound leaf; try labeling these terms before looking at that: stipule, leaflet, petiole, petiolule, and rachis.

A "palmate" leaf. Note that all the leaflets are attached to a common centre.

A "palmately trifoliolate" leaf. Again, the attachment of the leaflets are to a common centre.

A "pinnately trifoliolate" leaf. Two leaflets are attached to a centre and the third is extended.

Another pinnately trifoliolate leaf.

The labeled compound leaf.

A flowering stem of Lupinus. What is the inflorescence type; raceme or spike?
highlight to see the answer: RACEME, because the flowers are not attached directly to the stem. They are attached to the pedicels which are attached to the stem.

Banner, Wings and Keel. How many petal(s) are contained in each of the structures?

Here's similar flower (also from Fabaceae); this one has a better view of the wings and keel.

Monadelphous - all 10 stamens fused into a tube.

One free and 9 fused stamens - Diadelphous

A section through the ovary.

Edamame - the tasty immature soy bean that bears the typical fruit type of the Fabaceae, a legume.

The soy bean splits along two sutures revealing 3 ovules.

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