Posts tagged with weeds

Re-planting New Zealand

Karo (Pittosporum crassifolium), which is native to the northern North Island, smothering the locally-native Melicytus obovatus at Titahi Bay, Wellington.  Photo Leon Perrie. © Te Papa.

In regard to Bob Brockie’s recent article in the Dominion Post (24 June 2013, page A8), here is some rationale for viewpoints about plants that some commentators have teasingly called “eco-fascism”. Instead, they are logical expressions about the conservation of New Zealand’s biota and ecosystems, including their genetic integrity. For any effort claiming to be… Read more »

Plant Conservation Conference and weedy native plants

Pittosporum crassifolium (karo) is native to the northern North Island. However, it has been widely cultivated, and is now spreading aggressively in many places. In Titahi Bay, karo threatens to displace locally-native species, including some of conservation significance. In the photo, karo is overtopping, and will eventually displace, the locally-native Melicytus obovatus. Photo Leon Perrie. © Te Papa

I’m just back from the 2013 conference of the New Zealand Plant Conservation Network, where I presented a talk about weedy native plants. The programme of talks included updates on the conservation status of New Zealand’s plants, and the new system being implemented by the Department of Conservation to prioritise management of ecosystems and species…. Read more »

The small and the weedy: Foxton field trip

  • A huddle of prostrate people peering intently at the ground; can only mean a botanical society has fixated on some small plant. Photo © Leon Perrie.
  • The botanical society did not progress far through the tangled swamp forest vegetation of Round Bush/Omarupapako Scenic Reserve. However, we went far enough to encounter karaka (Corynocarpus laevigatus) and to debate its merits in the southern North Island, where some people consider it to be weedy. The large trunk at centre is a podocarp, while the trunk to the immediate left is a tall and reproducing but not particularly old karaka. Karaka seedlings are evident in the foreground. Photo © Leon Perrie.
  • Arrowgrass, Triglochin striata, is not actually a grass, and belongs to the unusual monocot family Juncaginaceae. The arrangement of the flowers and the narrow leaves are distinctive. Photo © Leon Perrie.
  • Intermixed Selliera rotundifolia, with the round leaves, and Lilaeopsis novae-zelandiae, with the jointed linear leaves. Selliera rotundifolia is only found in the south-west of the North Island. Photo © Leon Perrie.

I spent a couple of days of the long weekend with the Wellington Botanical Society, exploring the Foxton area, between Whanganui and Palmerston North. Much of the first and second days were spent in the sand dunes between Himatangi and Foxton Beach, and at Koitiata near Turakina.  Some surprising things can become weedy in the… Read more »

Help with floating fern

Azolla plants often become red in full sunlight, and they can become so abundant that they carpet ponds, drains, and other still bodies of water. This is Azolla filiculoides in a pond on Mana Island, Wellington. Photo Leon Perrie. © Te Papa.

I’ve recently learnt that the introduced Azolla pinnata (ferny azolla) has been found in the Wellington region. I’m interested in its distribution and would be grateful for help in looking for more. Azolla plants are fairly easy to spot: look for a red plant covering still bodies of water. Azolla are ferns, believe it or… Read more »

Hybrid hunt turns up more weedy natives

Meryta sinclairii, puka.  Self-sown saplings near Porirua.  Photo by Leon Perrie, Curator. © Te Papa.

I was out last week with Tim Park from the regional council looking for Pseudopanax hybrids between lancewood and coastal five-finger near Porirua.    Coastal five-finger and the hybrids are weeds in the Wellington region. Previous post on lancewood and coastal five-finger hybridisation. We spotted a couple of other weedy natives – New Zealand species that… Read more »