Cordyline

• Heenan, P. (1991). A cultivar checklist for the New Zealand species of Cordyline (Asphodelaceae). Horticulture in New Zealand 2(1): 8–12.

Also see:

• Heenan, P. (1991). Cordyline cultivar names – three new combinations. Horticulture in New Zealand 2(1): 6–7.
• Heenan, P. (1994). Cordyline australis ‘Karo Kiri’ (Asteliaceae): a new dwarf cabbage tree cultivar from New Zealand. New Zealand Garden Journal 5(2): 2–3.

Hebe

• Metcalf, L.J. (2001). International register of hebe cultivars. Royal New Zealand Institute of Horticulture. 232 pp.

Hardcopy available for sale

Leptospermum

• Metcalf, L.J. (1963). Check list of Leptospermum cultivars. Royal New Zealand Institute of Horticulture (RNZIH) Journal 5: 224–230.
• Dawson, M. Checklist of Leptospermum cultivars: unpublished update in prep.

Also see:

• Dawson, M.I. (1990). Leptospermum scoparium (manuka) – chromosome variation of cultivars. Horticulture in New Zealand 1(2): 15–19.
• Harris, W.; Dawson, M.; Heenan, P. (1995). Opportunities for Leptospermum hybrid ornamental cultivars and a new ornamental cultivar Leptospermum ×violipurpureum ‘Karo Spectrobay’. New Zealand Garden Journal 6(1): 3–8.
• Dawson, M. (2009). A history of Leptospermum scoparium in cultivation: Discoveries from the wild. The first of a two-part series. New Zealand Garden Journal 12(2): 21–25.
• Dawson, M. (2010). A history of Leptospermum scoparium in cultivation: Garden selections. The second of a two-part series. New Zealand Garden Journal 13(1): 2–9.
• Dawson, M. (2012). Australian Leptospermum in cultivation: Species and cultivars. The first of a two-part series. New Zealand Garden Journal 15(2): 14–22.
• Dawson, M. (2013). Australian Leptospermum in cultivation: Interspecific hybrids. The second of a two-part series. New Zealand Garden Journal 16(1): 2–15.
• Bicknell, R.; Boase, M.; Morgan, E. (2018). Rediscovery of the tetraploid manuka cultivar Leptospermum scoparium ‘Keatleyi’. New Zealand Garden Journal 21(2) 10–12.

Metrosideros

• Dawson, M. and Heenan, P. (2010). Checklist of Metrosideros cultivars. New Zealand Garden Journal 13(2): 24–27.

Also see:

• Dawson, M.; Hobbs, J.; Platt, G.; Rumbal J. (2010). Metrosideros in cultivation: Pohutukawa. The first of a two-part series. New Zealand Garden Journal 13(1): 10–22.
• Dawson, M.; Hobbs, J.; Platt, G.; Rumbal J. (2010). Metrosideros in cultivation: Rata and other species. The second of a two-part series. New Zealand Garden Journal 13(2): 10–23.
• Dawson, M. (2011). Origins of pohutukawa cultivars in Australia. New Zealand Garden Journal 14(2): 2–3.
• Dawson, M. (2011). The origin of Metrosideros ‘Spring Fire’? New Zealand Garden Journal 14(2): 4–7.

Phormium

• Heenan, P.B. (1991). Checklist of Phormium cultivars. Royal New Zealand Institute of Horticulture, Lincoln, New Zealand.

List of cultivars in the Manaaki Whenua - Landcare Research flax/harakeke collection at Lincoln (those in bold are newer than Heenan 1991):

• ‘Alf’
• ‘Alison Blackman’
• ‘Black Adder’
• ‘Black Rage’
• ‘Blondie’
• ‘Chocolate Cookie’
• ‘Chocomint’
• ‘Crimson Devil’
• ‘Golden Ray’
• ‘Green Dwarf’
• ‘Hazy Dayz’
• ‘Jester’
• ‘Joker’
• ‘Liquorice and Lime’
• ‘Margaret Jones’
• ‘Mellow Yellow’
• ‘Merlot’
• ‘Moonraker’
• ‘Pizazz’
• ‘Purple Haze’
• ‘Royal Flush’ (‘Ruby’)
• ‘Ruby Tuesday’
• ‘Stormy Port’
• ‘Sunset Dreams’
• ‘Taya’
• ‘Veneer’
• (Phos 3)
• Phos 4 (‘Chocomint Mist’)
• ‘Apricot Queen’
• ‘Aurora’
• ‘Bobby Dazzler’
• ‘Bronze Baby’
• ‘Bronze Elf’
• ‘Bronze Tongue’
• ‘Burgundy’
• ‘Co-ordination’
• ‘Cream Delight’
• ‘Dark Delight’
• ‘Dazzler’ ‘Duet’
• ‘Dusky Chief’
• ‘Elfin’
• ‘Emerald Green’
• ‘Evening Glow’
• ‘Fountain City’
• ‘Gold Spike’
• ‘Green Fingers’
• ‘Guardsman’
• ‘Jack Spratt’
• ‘Levels Gold’
• ‘Maori Chief’
• ‘Maori Maiden’
• ‘Maori Queen’
• ‘Maori Sunrise’
• ‘Needles’
• ‘Platt’s Black’
• ‘Purpureum’
• ‘Radiance’
• ‘Rainbow’
• ‘Rubrum’
• ‘Smiling Morn’
• ‘Sundowner’
• ‘Surf Rider’
• ‘Surfer Boy’
• ‘Surfer’
• ‘Thumbelina’
• ‘Tricolor’
• ‘Twister’
• ‘Yellow Wave’.

Sophora

• Heenan, P. (1992). Appendix 1: Checklist of Sophora cultivars. In: The origin of Sophora ‘Gnome’ and the growth habit of Sophora ‘Earlygold’. Horticulture in New Zealand 3(1): 2–6.