Lovely Lacebarks

Brachychiton discolor
Family: STERCULIACEAE

I photographed this lovely tree in the grounds of the Goombungee town hall last weekend.
This local native species has been planted in a number of sites in our area, notably along the New England Highway at Highfields, and we are now able to appreciate the young trees as they reach flowering age.
Lacebarks (like their relatives the flame trees) tend to have a partial loss of their leaves at flowering time. Trees planted against a background others with dark green canopies are shown off to their best advantage, but the flowers are also quite stunning on a mature tree with fairly complete leaf-drop, against a background of a blue November sky.

As with flame trees, part of their beauty is the scatter of flowers below them.

The colours of the dropped flowers are a stronger shade of pink than the flowers on the tree.

 You'll also notice the rather lovely rusty-hairy buds, and the felty texture of the flowers.


Lacebarks are beautiful in the garden from an early age, because of the attractive shape of their juvenile leaves.  Small trees are sometimes used as potted indoor plants for the beauty of their leaves alone.


As they mature, they develop a trunk which shows their relationship with bottle trees.

This lovely old tree (the one with the white bark)  is a naturally occurring plant, a remnant of long-gone rainforest on Mt. Kynoch.

Lacebarks  get their common name from the attractive bark of the mature trees. In their native rainforest environment (and in gardens on the damp side of town) they attract a garden of beautiful lichens.


See my article, “Beautiful Brachychitons” of December 30, 2008, for more on this outstanding local plant.

Smooth Lolly Bush

Clerodendrum floribundum
Family: LAMIACEAE

I found these plants beside the Acland Silverleigh Road yesterday.
To me, this is a less familiar plant than its hairy cousin Clerodendrum tomentosum, which we see closer to the great Dividing Range. The hairy lolly bush (See article Feb 2009) is not noticeably hairy, but on feeling the leaves you notice the soft, puppy’s ears texture.
The smooth lolly bush, however, has stiff leaves without a hint of hairiness.

 
 
The plant has white flowers, followed by these brilliant, showy red calyces. The fruits in them mature from green to red.
Obviously their appearance has reminded someone of lollies, but please don’t eat them.
These fruits are not edible. I can find no record that they are toxic, but given the use of many other Clerodendrum species for medicinal purposes, they are very likely to be. There is a very fine line between drugs which cure and poisons which kill.



 
The name "Clerodendrum" can be translated as "lottery tree" and they are sometimes called chance trees. They were used as cures for some particularly deadly diseases, so the name is a reference to the chance that they might save a life. (It may also have referred to a chance that the cure was even worse than the disease.)

The fruits ripen from green to black, and were just beginning to turn on these plants.

This would be a very hardy garden plant, tolerating extreme drought and some frost. We can expect them to respond well to pruning, like C. tomentosum.
If you want to grow them, and have young children, you may feel it is better to refer to the plant by the name “chance bush” to discourage unsupervised trialling of the “lollies”.

Greenwattle

Acacia irrorata
Family: MIMOSACEAE
 
Just when we think the local wattle season is over, yet another of our many showy local species bursts into bloom. Than we notice that there are hundreds of them on our roadsides and waste bits of land, in the red soil areas around Toowoomba. They're looking lovely at present, and are part of the distinctive summer character of our own patch of the world.
Greenwattle Street, on the western side of town, was named after them.

Where a fast-growing, pretty, small tree is needed to fill a temporary space, this is one of the best. It has almost reached its full size by the age of about five years, and looks wonderful for the next five.
From there, it’s all downhill, however. The canopy thins out and the plant starts to look shabby. It can go on looking increasing scruffy for another ten or more years, but it might be less painful to get rid of it and fill the space with something else. Like all wattles, it has nitrogen-fixing root nodules, so killing it results in a burst of soil nitrogen becoming available to other plants put in immediately afterwards.
It its glory years, however, it is most attractive, with its dark green, shady canopy and its summer flowers.
It is a particularly good plant for wildlife. Birds like the dense foliage for nesting, and find plenty to eat in the unusually large variety of insects (including some lovely butterflies) that live on this tree.
It’s also a very good windbreak for its first ten years, while the foliage is still dense.
Don’t, however, be deceived into thinking that these wattles could be used as “nurse plants”,  sheltering slower-growing plants until they are established. Part of the secret of the cinnamon greenwattle's fast growth is its mat of shallow, greedy roots. Far from being a nurturing neighbour, it retards the growth of any small-rooted plant close by. Use it on its own, or as a very decorative infill between older plants, such as Eucalypts.

 For more on local wattles, search for Mimosaceae or Acacia using the white search box at top left.

The Ghost Gate Hop Bush

Dodonaea heteromorpha
Family: SAPINDACEAE
Nature has many surprises for those of us who stop and look. A recent surprise, for me, came from a closer look at these two hopbushes.

They were on the roadside by Ghost Gate Road, between Allora and Goomburra (the road with the interesting local legend and owl sculpture). We had stopped on a low ridge to look at the rather lovely view to the west, when the hopbushes attracted our attention with their showy display of bright red hops.
Who would have thought that they would be two different species?
The one on the left is Dodonaea viscosa subsp. angustifolia. (See article below)
The other is Dodonaea heteromorpha.


Note that the leaf in the photo has six pairs of leaflets. This tended to vary considerably from leaf to leaf with some having as few as one leaflet, but six was fairly typical. The leaves were shiny, as shown, and close examination with a magnifying glass revealed that they were covered quite densely with white hairs.
The leaves were mostly 5-6cm long (including the petiole). They all have that rather large terminal leaflet, which seems to rather unusual for a Dodonaea.
The long-lasting, pretty, rose-pink, seed capsules of this plant have four wings, in contrast to the nearby D. viscosa subsp. angustifolia, plant whose capsules have three wings.

The plant has a neat growth habit, about 3m high, and with a trunk 60cm in diameter. It is a female plant (of course, as the male plants don't have seeds). We couldn't find any nearby plants, but there must be some, as the capsules, which are ripening this week (23 October) have seed in them. I collected some to be grown in the Crows Nest Community Nursery.
They were planted today, so you can look for them there in a few months' time.

Narrow-leaf Hop Bush

Dodonaea viscosa subsp. angustifolia
Family: SAPINDACEAE

This sturdy plant is looking pretty in the wild, at present, with its coloured hop-like seed capsules. We find it in on ridges and hillsides in our local black soil areas.
Dodonaea viscosa is a large and very variable genus with seven subspecies, at least three of which grow on the Darling Downs. The various subspecies occur naturally from Africa (where it is known as “sand olive”) through India, Australia and many Pacific islands, to tropical America. The one most often sold in nurseries (often incorrectly labelled “native”) is a purple leaved variety of Dodonaea viscosa subsp. viscosa from New Zealand.
We have three subspecies on the Darling Downs, and they all have the typical “viscose” (shiny-sticky) leaves of the species.

This narrow-leafed subspecies is one of the hardiest to drought, and makes a good garden plant. The showy hops  grow only on the female plants, and many growers prefer to produce their plants from cuttings so as to be sure of having females. They are wind pollinated, and female plants have been known to receive pollen from male plants as much as two kilometres away. They do produce capsules even if not pollinated, but of course in that case they are empty of seeds.
If grown as seedlings, these rather slender plants might be best planted in close groups, which can be thinned down as they mature to flowering age and reveal their sex.
Some growers consider that putting a little mother soil from around a parent plant produces healthier plants. This practice inoculates the soil with soil fungus, and it may be that hop bushes, like many other Australian plants, grow better in association with their favourite fungus. This is something to consider if you are collecting seed, which can be done over the next month or so.


(For more on Dodonaea species, use the white search box at top left of page.)

Getting Bugs

Insect Study at Franke Scrub, Highfields
Saturday 12 October, 9.30am to 5.30pm.

Members of the public are invited to participate in this event, whose aim is to survey the insect population in this remnant of local dry rainforest.


No specialist qualifications or knowledge are needed - just an interest in insects and how they interact with the environment.



Scientists from the Queensland Museum will guide the participants in using various scientific methods of collection, and then (once again with plenty of expert help), we will spend the afternoon in a local hall, sorting the catch into orders.

(This is an activity for adults, though older school students with a particular interest in biology will be considered.)






REGISTRATION IS ESSENTIAL.
To register, please email me (address at right). Only a few places remain, so register soon to be sure of a place.




For more information, see the Franke Scrub Blog at http://frankescrub.blogspot.com.au/

Dogwood

Jacksonia scoparia
Family: FABACEAE
 
I wrote about this plant four years ago, so we don’t really need another blog about it. However, it’s looking so lovely that I couldn’t resist it, and perhaps it’s interesting to compare the present plant with its own self in the older photo.
I love these elegant plants, which light up the bush so reliably at this time every year with their little pea flowers.
 
Note the very obvious red "nectar guides". It is rather curious that they are red, as the most obvious insects using the plant are bees, both native and European. Bees can't see red, but love bright yellow flowers.  Perhaps they see something else in those red streaks, that human eyes miss.
I had some difficulty cultivating my row of them, in a narrow strip between the drive and the property boundary. Young dogwoods are rather whippy and blow about in the wind, so it took a long time for the trunks to become sturdy enough to stop injuring themselves on the fence.
I had to tie and pad them. I don’t like staking plants, as it allows them to grow too tall for the structural strength of their roots. If you look back at the older photo (use the white search box at the top left of this page) you will notice I have lost one of my row of dogwoods since then. It was always weaker than the others, but last year it had reached a level of sturdiness which I thought would let me remove its tie. It might have survived, but the site is at the top of a very windy hill and a storm took it out. This would probably not have happened if the weather had allowed it to sway gently on those roots for another few months, encouraging them develop the strength they needed.
A row of identical plants can be a garden design mistake. There is always the “Alas poor Yorick” element when the row develops a gap.
However, I do enjoy the remaining dogwoods, and look forward to the time when the gaps will be filled with the  a suitable climber.