The second largest genus is Asperula, which contains about 200 species.

Some recipes also add cognac or substitute woodruff for the asperula.

There are also records for Asperula species.

The larvae have been recorded on Scabiosa, Cephalaria, and Asperula species.

The larvae feed on Galium and Asperula cynanchica.

It has been sunk into synonymy with x Galiasperula, which is an artificial hybrid of Galium and Asperula.

Species Asclepias asperula (Decne.)

The genus contains only one species, i.e. Galiasperula ferdinandi-coburgii, which is a hybrid of Asperula and Galium.

The larva feed on Asperula and Galium species (including Galium palustre and Galium uliginosum).

The prickly deepsea skate, Brochiraja asperula, is a skate of the genus Brochiraja, found around New Zealand, at depths of from 200 to 1,300 m on the continental shelf.

The larvae feed on various Fabaceae species, including Cytisus scoparius, Genista (mainly Genista tinctoria, Dorycnium, Scabiosa, Rumex, Polygonum, Thymus and Asperula.

The base is made by steeping the fragrant creeping herb sweet woodruff (Galium odoratum, sometimes called Asperula odorata, known in Germany as Waldmeister) that grows in the forests of Northern Europe in a white German wine.

Several localised plant species such as Squinancywort Asperula cynanchica Chalk Eyebright Euphrasia pseudokerneri, Horseshoe Vetch Hippocrepis comosa, Autumn Gentian Gentianella amarella and Clustered Bellflower Campanula glomerata occur.