D³ database

Diaspore Form

Summary

 

The DIASPORE FORM is a categorical trait which describes the form of the diaspore in four categories: spherical, elongated, flat and elongated & flat.

 

 

Trait description

 

DIASPORE FORM (column code: DIA_FORM) is a categorical trait which describes the form of the diaspore as one of the following categories (Tab. 1). In contrast to the diaspore shape, it allows distinguishing between flat and elongated forms.

 

Tab. 1. Categorization of DIASPORE FORM

Form

Examples

Constraints

spherical

Glycine max

(length/width < 3)

and

(width/height < 3)

and

(length/width + width/height < 4.5)

 

flat

Oxyria digyna

(width/height 3)

and

(length/width < 3)

 

elongated

Festuca rubra

(length/width ≥ 3)

and

(width/height < 3)

elongated & flat

Pinus nigra

(length/width + width/height 4.5)

OR

(length/width ≥ 3)

and

(width/height 3)

Data sources

 

DIASPORE FORM is calculated from all information on diaspore size that was available. For each taxon the mean values of the size measurements were used if more than one measurement was available. Accordingly, it cannot be directly calculated from the presented information on diaspore size in some species.