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A U S T R AL I A N N A T I V E P L A N T S S O C I E T Y ( A U S T R A L I A ) Isopogon & Petrophile Study Group Newsletter No. 25 November 2019 ISSN 1445-9493 Website http://anpsa.org.au/iso-petSG/ STUDY GROUP LEADERS/NEWSLETTER EDITORS Catriona Bate & Phil Trickett Email: [email protected] Ph: 0409 789 567 Isopogon ‘Coaldale Cracker’ in cultivation, Little Forest NSW. See our articles in this issue. Back issues of the Isopogon & Petrophile Study Group Newsletter are available at http://anpsa.org.au/iso-petSG/IPSG-news.html Isopogon & Petrophile Study Group Newsletter 25, November 2019 1 In this issue Editorial From our members Exchanging cuttings and seed Isopogon uncinatus makes Top 100 Update on current threats to isopogons and petrophiles Petrophile latericola stamp sows the seeds of conservation Introducing a new hybrid Finding ‘Coaldale Cracker’ Isopogons through insect eyes Northern exposure Isopogon profile – Isopogon linearis Petrophile profile – Petrophile axillaris Species that mound – Dryandras, Petrophile filifolia and Isopogon villosus: Margaret Pieroni Species named for people On the Etymology of Petrophile shirleyae (Proteaceae): Peter M. Olde Petrophile shirleyae (conesticks): Allan Carr Interstock grafting WA spring report 2019 Turning heads in the bush In the press Financial report Hi fellow Isophiles, Firstly, we wish to thank everyone for their generous feedback on THE PETROPHILE ISSUE, focusing on the poor relation of I & Ps, the petrophiles. We feel they are very under-appreciated and that once we learn to propagate and successfully grow some of the many spectacular species, that will all change. We had a number of ‘new’ isopogons flowering for the first time for us in our garden this spring, all grafted onto the new hybrid we report on in this issue. I. adenanthoides, I. gardneri and the I. gardneri*I. divergens hybrid all flowered well at two years of age. One ‘new’ petrophile species also flowered for us for the first time – P. filifolia ssp. filifolia. This was grafted onto P. shirleyae. With Spring now coming to an end we hope that your isopogons and petrophiles have given you plenty of Spring joy. Though we have only had 40% of our annual rain here, we have had just enough regular showers to keep the I & Ps ticking over. The petrophiles are just starting to come into their own now. A group of P. sessilis bud flower head clusters is looking good in a vase (pictured, right). However, we know just how dry so many regions of Australia are, notably our members in Armidale and Uralla suffering incredibly from the relentless drought. And now with our bush burning in many states of Australia, urgent action to address our runaway climate change is needed if our beautiful plants are to survive. This message is coming through from multiple sources and we cover them and Isopogon & Petrophile Study Group Newsletter 25, November 2019 2 conservation issues generally in three articles this newsletter. Two species, I. uncinatus and P. latericola, are current conservation flag-bearers. Our feature species this issue include two of the lesser-known western pink species – P. axillaris and I. linearis. They were two of the many species collected by Drummond and examined by Meisner, and both were described in the same year, 1855. Both are highly attractive but little cultivated species from north of Perth towards the coast. Their specific names are confusing, because the same name is used in both genera, and it is the other ones (I. axillaris and P. linearis) which are better-known. Our profiles will set you straight. After much investigation we can report on a new isopogon hybrid and the story of its discovery. We have named it ‘Coaldale Cracker’ in reference to the road near Grafton where it grows alongside its two parents I. mnoraifolius and I. petiolaris. This hybrid has the potential to be very popular. It ticks all the boxes – on the smaller side, lots of brilliant yellow flowers, highly attractive foliage, and very adaptable. Phil’s grafting update explains interstock grafting which is required to successfully graft two of our spectacular isopogons – I. formosus and I. baxteri. Though it adds one more step to the grafting process, Phil explains why success rates are high for this method once compatibility is resolved. It wasn’t the greatest year for wildflowers in the west but there’s always some of the 90 plus WA species to admire. We have an overview of the 2019 spring season for your enjoyment thanks to some of our members. We also look at some interesting aspects of isopogon and petrophile growth habits (aspect, mounding habit) and get a taste of what isopogons look like to pollinators (isopogons in ultraviolet light). We all try to learn and retain species names but it’s not easy, especially when they occur across genera. Catriona looks at isopogons and petrophiles named for people and who those people were. A very special example is P. shirleyae. There has been something of a mystery over exactly who it was named for which has now been solved. Peter Olde documents its etymology properly for the first time and Allan Carr gives us an overview of this excellent species. We understand that it’s a difficult time to keep plants growing, but why not propagate a few species for when the rains come, hopefully early next year. New species are in the process of being added to the list of species that members can access from our garden. A priority for you all must be our new hybrid I. ‘Coaldale Cracker’ which is incredibly easy to strike from cuttings and will make a wonderful garden plant. Why not check out the guidelines for exchanging cuttings and seed and give it a go? If you’re already growing it, send us your feedback. Catriona and Phil From our members Margaret Pieroni, Denmark WA [April 2019] Thank you for your wonderful Petrophile newsletter. I was interested to know that P. filifolia is so popular. My plant of P. filifolia only lived for 5 years and died suddenly. It would be interesting to learn whether other members had plants for longer. [It could behave like] …Dryandra nivea [which has a similar mounding habit and in the wild] tends to become top-heavy and collapse in the centre. [November 2019] …I spent most of the conference week at the exhibition which was very successful. [Margaret was one of five artists featured in the exhibition ‘True to Nature: A Celebration of Western Australia’s Wildflowers’ in Albany. She had twenty watercolours on display, including Rose coneflower Isopogon formosus.] …Peter Walmsley’s nursery has closed recently. That is a pity because I was looking forward to taking you there and maybe picking his brains about the Bluff Creek form of I formosus. Isopogon & Petrophile Study Group Newsletter 25, November 2019 3 Karlo Taliana, Georges Hall, south-western Sydney Attached are a couple of pics of my Petrophile teretifolia in my home garden. It was grafted by Tony Henderson several years ago. This year it produced over 20 heads. It is probably one of my most valued plants due to the amazing colours. Liesbeth Uijtewaal, The Netherlands Just a short note to send you a pic I took this afternoon, not sure whether I’ve sent you a photo of the bud (scales) of I. divergens before. It’s a very interesting one with the tuft of bracts(?) on top! Last year you said you were interested in pics of the bud scales, not sure that you’ve a complete collection yet. BTW lovely surprise in the propagator today: roots on P. ericifolia, propagated 23 Sep which isn’t bad is it. There’s 7 cuttings, I feel that 2 have struck already since it looked like the 2nd rootlet came from a different direction. Time will tell. ….I’m so pleased with the P. ericifolia cuttings! Since I’ve only got the one plant I thought I’d better try and get back-up plants. There’s three cuttings in the one little pot, it seems like two of them have struck roots. I’m not sure what to do: check them and separate if there’s two indeed or just keep them in the one pot? Now that I’m writing this I think I’d go for the safe solution and keep the lot together, no harm in having two plants in the one pot. It might be nice to have a surplus one to give to someone else but at the moment I’d rather make sure I’m not losing any of this precious species! I took 7 cuttings in total, planted them into two pots so chances are the other cuttings might strike roots too so then I might have my give-away plant. Kevin Collins, Mount Barker WA I & Ps cutting grown that have flowered this season, most for the first time: Isopogons attenuatus, scabriusculus, polycephalus, trilobus, buxifolius (linearis), buxifolius (obovatus), spathulatus; Petrophiles rigida, brevifolia, diversifolia (see photo, left), diversifolia X serruriae, squamata. New cuttings that have struck: Isopogons cuneatus, formosus, fine lobed trilobus variant; P. teretifolia and P. helicophylla grown from underground stem piece. P. diversifolia spent cones Isopogon & Petrophile Study Group Newsletter 25, November 2019 4 Patrick Laher, Uralla NSW On the Northern Tablelands of NSW during the winter of 2018, we only had a week of heavy frosts, but a -10°C polished off all of my WA petrophiles and left me with one Isopogon formosus and one I. Stuckeys Hybrid.
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