'I'll get it!' Flor said. A tigerfly had killed one of her babes.

Now the creature came in fast and low. Ducking, Flor reached up and seized its shaggy hair, swinging the tigerfly off balance. Quickly she raised her sword. Bringing it down in a mighty sweep, she severed that chitinous and narrow waist.

The tigerfly fell away in two parts. The two women ran on.

The branch, a main one, did not grow thinner. Instead, it ran on and grew into another trunk. The tree, vastly old, the longest lived organism ever to flourish on this little world, had a myriad trunks. Very long ago – two thousand million years past – trees had grown in many kinds, depending on soil, climate, and other conditions. As temperatures climbed, the trees proliferated and came into competition with each other. On this continent, the banyan, thriving in the heat and using its complex system of self-rooting branches, gradually established ascendancy over the other species. Under pressure, it evolved and adapted. Each banyan spread out farther and farther, sometimes doubling back on itself for safety. Always it grew higher and crept wider, protecting its parent stem as its rivals multiplied, dropping down trunk after trunk, throwing out branch after branch, until at last it learnt the trick of growing into its neighbour banyan, forming a thicket against which no other tree could strive. Their complexity became unrivalled, their immortality established.

On the continent where the humans lived, only one banyan tree grew now. It had become first King of the forest, then the forest itself. It had conquered the deserts and the mountains and the swamps. It filled the continent with its interlaced scaffolding. Only before the wider rivers or at the margins of the sea, where the deadly seaweeds would assail it, did the tree not go.

And at the terminator, where all things stopped and night began, there too the tree did not go.

The women climbed slowly now, alert as the odd tigerfly zoomed in their direction. Splashes of colour grew everywhere, attached to the tree, hanging from lines, or drifting free. Lianas and fungi blossomed. Dumblers moved mournfully through the tangle. As they gained height, the air grew fresher and colour rioted, azures and crimsons, yellows and mauves, all the beautifully tinted snares of nature.

A dripperlip sent its scarlet dribbles of gum down the trunk. Several thinpins, with vegetable skill, stalked the drops, pounced, and died. Lily-yo and Flor went by on the other side.

Slashweed met them. They slashed back and climbed on.

Many fantastic plant forms there were, some like birds, some like butterflies. Ever and again, whips and hands shot out, taking them in mid-flight.

'Look!' Flor whispered. She pointed above their heads.

The tree's bark was cracked almost invisibly. Almost invisibly, a part of it moved. Thrusting her stick out at arm's length, Flor eased herself up until stick and crack were touching. Then she prodded.

A section of the bark gaped wide, revealing a pale deadly mouth. An oystermaw, superbly camouflaged, had dug itself into the tree. Jabbing swiftly, Flor thrust her stick into the trap. As the jaws closed, she pulled with all her might, Lily-yo steadying her. The oystermaw, taken by surprise, was wrenched from its socket.

Opening its maw in shock, it sailed outward through the air. A rayplane took it without trying.

Lily-yo and Flor climbed on.

The Tips was a strange world of its own, the vegetable kingdom at its most imperial and most exotic.

If the banyan ruled the forest, was the forest, then the traversers ruled the Tips. The traversers had formed the typical landscape of the Tips. Theirs were the great webs trailing everywhere, theirs the nests built on the tips of the tree.

When the traversers deserted their nests, other creatures built there, other plants grew, spreading their bright colours to the sky. Debris and droppings knitted these nests into solid platforms. Here grew the burnurn plant, which Lily-yo sought for the soul of Clat.

Pushing and climbing, the two women finally emerged on to one of these platforms. They took shelter from the perils of the sky under a great leaf and rested from their exertions. Even in the shade, even for them, the heat of the Tips was formidable. Above them, paralysing half the heaven, burned a great sun. It burnt without cease, always fixed and still at one point in the sky, and so would burn until that day – now no longer impossibly distant – when it burnt itself out.

Here in the Tips, relying on that sun for its strange method of defence, the burnurn ruled among stationary plants. Already its sensitive roots told it that intruders were near. On the leaf above them, Lily-yo and Flor saw a circle of light move; it wandered over the surface, paused, contracted. The leaf smouldered and burst into flames. By focusing one of its urns on them, the plant was fighting them with its terrible weapon – fire.

'Run!' Lily-yo commanded, and they dashed behind the top of a whistlethistle, hiding beneath its thorns, peering out at the burnurn plant.

It was a splendid sight.

High reared the plant, displaying perhaps half a dozen cerise flowers, each flower larger than a human. Other flowers, fertilized, had closed together, forming many-sided urns. Later stages could be seen, where the colour drained from the urns as seed swelled at the base of them. Finally, when the seed was ripe, the urn – now hollow and immensely strong – turned transparent as glass and became a heat weapon the plant could use even after its seeds were scattered.

Every vegetable and creature shrank from fire – except the humans. They alone could deal with the burnurn plant and use it to advantage.

Moving cautiously, Lily-yo stole forth and cut off a big leaf which grew through the platform on which they stood. It was taller than she was. Clutching it to her, she ran straight for the burnurn, hurling herself among its foliage and shinning to the top of it without pause, before it could turn its urn-shaped lenses up to focus on her.

'Now!' she cried to Flor.

Flor was already on the move, sprinting towards her.

Lily-yo raised the leaf above the burnurn, holding it between the plant and the sun, so that the menacing urns were in shadow. As if realizing that this ruined its method of defence, the plant drooped in the shade, a picture of vegetable dejection with its flowers and is urns hanging limply.

With a grunt of approval, Flor darted forward and cut off one of the great transparent urns. They carried it between them as they ran back for the cover of the whistlethistle. As the shadowing leaf fell away from over it, the burnurn came back to furious life, flailing its urns as they sucked in the sun again.

The two women reached cover just in time. A vegbird swooped out of the sky at them – and impaled itself on a thorn.

In no time, a dozen scavengers were fighting for its body. Under cover of the confusion, Lily-yo and Flor attacked the urn they had won. Using both their knives and all their strength, they prised up one side enough to put Clat's soul inside the urn. The side instantly snapped back into place again, an airtight join. The soul stared woodenly out at them through the transparent facets.

'May you Go Up and reach heaven,' Lily-yo said.

It was her business to see the soul stood at least a sporting chance of doing so. With Flor, she carried the urn across to one of the cables spun by a traverser. The top end of the urn, where the seed had been, exuded gum and was enormously sticky. The urn adhered easily to the cable and hung there glittering in the sun.

Next time a traverser climbed up the cable, the urn stood an excellent chance of sticking like a burr to one of its legs. Thus it would be carried away to heaven.

As they finished the work, a shadow fell over them. A mile long body drifted down towards them. A traverser, that gross vegetable equivalent of a spider, was descending to the Tips.