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Description
Aciphylla subflabellata is one of the larger species in the genus Aciphylla, and it contains clear exudate. This species is a perennial herb that forms stout rosettes of spiky leaves reaching 50—80 cm. The leaves are distinctive for being fan-like and flattened: the leaf pinnae are set close together, and are roughly in the same plane as the leaf axis. It is a "spear grass" with stems that can grow to 80 cm, producing a dense rosette at the top. These stems are arranged in a subfellate to pinnate shape and tend to be a yellow - green colour. The stems are 25 mm in diameter with a 2 cm sheath that parts into 2–4 ligules. Each ligule then contains leaflets that can grow to 25 cm long and 3 mm thick. The overall plant can grow to 1 metre in height. The flowering stem is up to 1 m tall and 25 mm wide, with a 50–60 cm inflorescence. The yellow flowers appear from December to February, and the wind-dispersed seeds in February to May.

In his description Oliver noted that this species was most similar to A. squarrosa in its narrow leaves and downturned terminal bract segments, but the finely-toothed terminal bracts are much longer (up to 30 cm) and the leaves are always bipinnate. A. subflabellata has more finely-divided and flattened leaves than A. squarrosa, and is usually much smaller.

Taxonomy & naming
Walter Oliver first described the plant in 1956, from a type specimen collected Waiau tussock grassland. Its specific epithet means "somewhat fan-like".

New Zealand range
Aciphylla subflabellata is endemic to New Zealand and only found on the eastern side of the South Island, from south-eastern Marlborough to Southland and from 300 to 1400 m. It prefers dry subalpine sites, and is sometimes found amongst rocks.

There are a few areas within Canterbury where speargrass is found, including the Banks Peninsula. Aciphylla subflabellata has been grown by people from seed and planted on the Banks Peninsula to help restore it

Habitat
Spear grass is usually found in dry climates amongst tussock grasses and rock. Spear grass is well suited to alluvial terraces, basins, or rolling hills, and does not like humid climates or being wet. This makes the east coast a good habitat. Spear grass can be found commonly growing alongside matagouri and Desert Broom.

Aciphylla subflabellata is one of 40 species of the genus Aciphylla, all only found in New Zealand and Australia. With not many populations of this plant left, its status is "at risk". One of the reasons this species is threatened is because of its lowland habitat. It is susceptible to change as the habitat has been modified over time; this includes burning the land many years ago to prepare the pasture for grazing sheep, speargrass is still under threat by grazing sheep.

Life cycle/Phenology
Aciphylla subflabellata produces flowers during the summer months of December–February. These yellow flowers are then pollinated by insects during a synchronised pollination period. Aciphylla subflabellata is a dioecious plant, so there are both male and female plants. Between February and May, after pollination, fruit is produced. When these fruits are dried, they crack and fall apart. The seeds are then dispersed by the wind. Speargrass is easy to grow and grows relatively quickly. Once Aciphylla subflabellata has been planted, it is best not to replant or disturb the roots.

Diet and foraging
Aciphylla subflabellata is found on the eastern side of the southern alps. The soils around this area are much drier and rocky compared to a low lying soil. The land is more exposed to strong winds, meaning Aciphylla subflabellata is suited to this type of environment. Aciphylla subflabellata is located at 300–1400 meters above sea level.

Predators, Parasites, and Diseases
One of the big threats to Aciphylla subflabellata are the predators. Many grazing animals, such as rabbits and livestock, eat spear grass. Rabbits can also dig up smaller speargrasses and kill the whole plant. Insects such as the endangered knobbled weevil also feed on speargrass. The adult weevils eat the leaves, and the larvae feed on the roots. Another threat is the amount of weeds that are overtaking the habitat, causing Aciphylla subflabellata populations to further decrease.

Studies on the endangered weevil have shown that Aciphylla subflabellata is one of the weevil's food sources. These studies also revealed some data about Aciphylla subflabellata such as where the species might be found in some parts of Canterbury. In Porters Pass, Canterbury, New Zealand, one Aciphylla subflabellata was collected. With this information, we can assume that more Aciphylla subflabellata will be present there.

Conservation
This species' status under the Department of Conservation's NZTCS system is "At Risk – Declining" It may be naturally uncommon over most of its range, but much of its habitat has been modified for pastoral farming and like most Aciphylla species it is vulnerable to browsing by stock, rabbits, and hares.

Cultural uses
Māori use species in Aciphylla to make perfumes. Maori collected the resin from the two species that they were able to identify; small and large taramea. Typically, only the larger Taramea would be used to make perfume. The resin collected could also be used as a medical remedy. Taramea is now classified as Taonga under the 1999 Ngi Tahu Treaty of Waitangi.