Archive of Vanished Flora
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First-frost Flower Pruinanthus alpinus
Specimen · N°008 · Ice · ▶ Film

Pruinanthus alpinus

It blooms just once a year, for only half a day.

FOUND 36.3°N 137.6°E · Alpine zone of the Japanese Alps  ·  ✝ EX · Last seen 1999

A small perennial about 6–10 cm tall. It lays dark-green slender leaves flat to the ground against the cold. The flowers are pale lilac and crocus-like, wilting by late morning as the frost melts. It opens for only half a day in the whole year.

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Moving Image

Vertical, as filmed / tap to play
MOTION CLIP

It blooms just once a year, for only half a day.

This footage was made vertical (9:16) and is also published on social media. The archive keeps it in its original ratio.

9:16 VERTICALCLIPSOUND ON
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Specimen Plates

8 plates · click to play
First-frost Flower plate 1PLATE I
First-frost Flower plate 2PLATE II
First-frost Flower plate 3PLATE III
First-frost Flower plate 4PLATE IV
First-frost Flower plate 5PLATE V
First-frost Flower plate 6PLATE VI
First-frost Flower plate 7PLATE VII
First-frost Flower plate 8PLATE VIII
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Field Note

Habitat
Alpine zone of the Japanese Alps. In autumn it appears on granite gravel only the morning after the first frost.
Local name
Messenger of Frost
Folklore
Locally, the morning it blooms was said to bring the year's first true cold.
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Locator

Coordinates
36.3°N 137.6°E
Alpine zone of the Japanese Alps
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Record

Narration
0:00 / --:--

It blooms only the morning after the first frost.

And so it can be seen but once a year.

The alpine gravel of the Japanese Alps.

In autumn, the morning after the first frost, the First-frost Flower appears.

Its slender dark-green leaves lie flat to the ground against the cold.

From among frost-wet gravel, a pale lilac flower quietly rises.

More分類・学名・語源などの詳しい標本データ
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Classification

Classification & specimen data
Scientific name
Pruinanthus alpinus  C. Iwabuchi, 1996
Taxonomy
Plantae › Angiosperms › Dicotyledons › PruinanthalesPruinanthaceaePruinanthus › alpinus
Voucher
AVF-008 · Holotype
Archive of Vanished Flora (AVF)
Conservation
✝ EX — Extinct Last seen 1999
Collector
E. Mori
1996-09-03
Synonym
Pruinopsis alpinus A. Reinholt, 1994
Protologue (Latin)
Herba parva rosulata, foliis crassis glaberrimis, floribus parvis stellatis. Typus: Alpine zone of the Japanese Alps. Species iam extincta.
Discovered / Described
1996 / 1996
Height
6〜10cm
Life form
Perennial herb
Phyllotaxy
Alternate
Chromosome
2n = 30
Flowering
Half a day after the first frost
Pollination
Small flies and wasps
Substrate · pH
Gravelly, near-neutral
Elevation
2,400〜3,000 m
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Etymology

Etymology of the name
PruinanthusGENUS
pruinfrost
anthflower
alpinusEPITHET
alpinalpine
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Related

Specimens of the same habitat
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