Melaleuca fulgens R. Br., Hortus Kew. 4: 415 1812. (syn: Melaleuca splendens J.Lee ex J.Kern.; Myrtoleucodendron fulgens (R.Br.) Kuntze);
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SW. & Central Australia as per POWO;
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SK 3502 22 May 2022: 3 very high res. images.
Habit : Cultivated
Leaves look quite linear unlike Callistemon citrinus
https://www.anbg.gov.au/callistemon/
https://xeraplants.com/plants/callistemon-subulatus-dark-red/
https://www.gardeningwithangus.com.au/callistemon-subulatus-brogo-overflow-bottlebrush/
Please look at Melaleuca fulgens
It looks good
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References:
POWO Catalogue of Life The Plant List Ver.1.1 WCSP IPNI Wikipedia
https://www.anbg.gov.au/gnp/gnp7/melaleuca-fulgens.html
https://florabase.dpaw.wa.gov.au/browse/profile/5912
https://anpsa.org.au/plant_profiles/melaleuca-fulgens/
https://www.bgpa.wa.gov.au/about-us/information/our-plants/plants-in-focus/melaleuca-fulgens