This rare species was first collected in 1986 and none of the known populations can be reached by road. <I>A. praemorsa</I> is an unusual species with its seemingly veinless truncated phyllodes. In the field it bears a striking resemblance to <I>Senna artemisioides</I> ssp. <I>petiolaris</I> (=<I>Cassia nemophila</I> var. <I>platypoda</I>) that have shed their terminal leaflets as often happens under harsh conditions. Despite a superficial resemblance to <I>A. nematophylla</I> (sp. 22) and <I>A. calarnifolia</I> (sp. 21) <I>A. praemorsa</I> belongs to the <I>A. microcarpa</I> (sp. 17) complex, i.e. A, acinacea (sp. 6), <I>A. irnbricata</I> (sp. 1 O) and <I>A. triquetra</I> (sp. 11). However it differs from members of the <I>A. microcarpa</I> complex in its linear to narrow linear phyllodes, submerged vein, raceme axes to 3.5 mm, more numerous flowers per head and punctulate seeds. A distinctive feature is the minute claw-like appendages flanking the terminal gland which has now been found on <I>A. microcarpa</I> in young growths from which they are often lost as the phyllode expands. Terminal glands are also uncommon in this section of Acacia but do occur in <I>A. victoriae</I> (sp. 13) and a few other species.