Species of flowering plant
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Acaena microphylla, the bidibid or piripiri, and outside New Zealand, New Zealand-bur, is a small herbaceous, prostrate perennial flowering plant in the rose family Rosaceae, native to both the North and South Islands of New Zealand. There are two varieties:
There are no synonyms.
Description.
Hooker describes it as "a very small and glabrous species; the leaflets not 1/4 in. long. "Capitula" very large for the size of the plant, upwards of an inch across, including the spines, which are not barbate, and distinguish it as a species."
Taxonomy and naming.
"Acaena microphylla" was first formally described in 1852 by Joseph Dalton Hooker. The genus name "Acaena" is derived from the ancient Greek word "akaina", meaning "thorn" or "spine", referring to the spiny calyx of many species of "Acaena". The specific epithet "microphylla" derives from the Greek words, (small) and (leaf), to give an adjective meaning "small-leaved".
Distribution.
It is found on both the North Island and South Island of New Zealand.
Conservation status.
In 2013, the variety "Acaena microphylla" var. "pauciglochidiata" was classified as "At Risk - Naturally Uncommon" under the New Zealand Threat Classification System. By 2018, due to an actual decline, the status changed to "At Risk - Declining". (The area of occupancy had decreased to 100 km2 or less, and the predicted decline was 10 to 50%). However, the variety "Acaena microphylla" var. "microphylla" was classified as "Not Threatened" in 2004, 2009 and 2012, and again in 2018.
References.
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