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Dawson, M. Checklist of Leptospermum cultivars: unpublished update in prep.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.