Black-eyed Susan is a low shrub that grows in clumps of single or multiple stems arising from a single rootstock. Stems are up to 1 m long, hairless with minute tubercles, and with two or three narrow wings that give them an angular appearance. The distinctly angular, winged structure distinguishes Black-eyed Susan from other members of the Tetratheca genus. Juvenile plants have alternate narrow lanceolate leaves. Mature plants are usually leafless but if leaves are present they are alternate, hairless, usually reduced to narrow triangular scales up to 3 mm long, or otherwise narrow-elliptic to 20 mm long and approximately 5 mm wide with flat or recurved margins.
Black-eyed Susan |
Status: Vulnerable on the EPBC Act list
Government evidence of impact of climate change:
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Australian Government, Conservation Advice, Tetratheca juncea
The main potential threat is poor recruitment as fresh seed viability is high but fire may be required for germination and seeds are not long lived in the soil (Bellairs et al.; 2006).