Cyanothamnus inflexus is an erect, woody shrub that grows to a height of about 2 m (7 ft) and a width of about 3 m (10 ft). The leaves are pinnate, 6–25 mm (0.2–1 in) long and 6–35 mm (0.2–1 in) wide in outline on a petiole 3–10 mm (0.1–0.4 in) long. The end leaflet is linear, 1–16 mm (0.04–0.6 in) long and 0.5–2.5 mm (0.02–0.1 in) wide, the side leaflets similar or longer. Up to three, sometimes up to seven white to pink flowers are arranged on a stalk 0.5–9 mm (0.020–0.35 in) long. The four sepals are triangular, mostly glabrous, 1.5–3 mm (0.059–0.12 in) long and 1–2 mm (0.039–0.079 in) wide. The four petals are 2.5–7.5 mm (0.098–0.30 in) long, sometimes with a few hairs. The eight stamens are hairy and the stigma is about the same width as the style. Flowering occurs from June to December and the fruit are 3–3.5 mm (0.12–0.14 in) long and 1–2 mm (0.039–0.079 in) wide.[2][3][4]
In the same 2003 paper, Duretto described four new subspecies.[2] The names have subsequently been changed to reflect the change in the genus name:
Cyanothamnus inflexus Duretto subsp. inflexus (the autonym) has its branches and leaves covered with minute, soft hairs, and petals 2–3.5 mm (0.079–0.14 in) long;
Cyanothamnus inflexus subsp. montiazureus is glabrous with the end leaflet 3–7 mm (0.12–0.28 in) long and 0.5–1 mm (0.020–0.039 in) wide;[7]
Cyanothamnus inflexus subsp. grandiflorus has its branches and leaves covered with minute, soft hairs, and petals 6.5–7 mm (0.26–0.28 in) long;[8]
Cyanothamnus inflexus subsp. torringtonensis is glabrous with the end leaflet 10–16 mm (0.39–0.63 in) long and 1–1.5 mm (0.039–0.059 in) wide.[9]
Distribution and habitat
Cyanothamnus inflexus grows in heath, woodland and forest on granite and in soils derived from granite. Subspecies inflexus occurs between Stanthorpe and the Girraween National Park and disjunctly in the Gibraltar Range National Park and subspecies montiazureus on a small hill near Applethorpe north of Stanthorpe. Subspecies grandiflorus occurs near Amiens and Lyra and subspecies torringtonensis is restricted to the Torrington area in New South Wales.[2][4]
Conservation
Cyanothamnus inflexus subsp. montiazureus (as Boronia inflexa subsp. montiazura is classed as "least concern" under the Queensland Government Nature Conservation Act 1992.[10]
^Duretto, Marco F.; Wilson, Paul G.; Ladiges, Pauline Y. "Boronia inflexa". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 22 March 2019.
^ abDuretto, Marco F. "Boronia inflexa". Royal Botanic Garden Sydney. Retrieved 22 March 2019.
^Duretto, Marco F.; Heslewood, Margaret M.; Bayly, Michael J. (2020). "Boronia (Rutaceae) is polyphyletic: Reinstating Cyanothamnus and the problems associated with inappropriately defined outgroups". Taxon. 69 (3): 481–499. doi:10.1002/tax.12242.
