Genus Galium
Madder Family (Rubiaceae)

Galium plant growing against a fallen log

(Galium aparine)

Bedstraw grows alongside trails and roads, usually where it is somewhat shady. It is also called catchweed or cleavers because the stems and leaves are covered with tiny barbs which cling to just about anything. When growing in cultivated fields, it is very difficult to separate it from the crops during harvest.

When used as a mattress filling, it would tend to keep its springiness by remaining in place rather than shifting and settling.

A bed of Galium plants

The plant has stems which are square in cross-section, and leaves which occur in whorls of six or more at the stem axils.
The white flowers are very tiny, and also grow from the stem axils.