Rolling Herb · Volvithamnus erraticus

An annual 8–15 cm tall. When moist it spreads slender silver-green leaves in a radial pattern and blooms small white flowers. When it dries, the whole plant curls inward into a dead ball that rolls in the wind to carry its seeds, opening again when rain comes.

Portrait

Vertical, as filmed / tap to play

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「Traveller of the Wind」

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Narration

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Specimen Plates

8 plates · hover to enlarge

PLATE I

PLATE II

PLATE III

PLATE IV

PLATE V

PLATE VI

PLATE VII

PLATE VIII

ARCHIVAL PRINTThis specimen is available as a printable plate: Illustrated edition — Etsy ↗ · Photographic edition — Etsy ↗

Field Note

Habitat

The bed of a dried-up lake in a Middle Eastern desert. Across the cracked dry mud it curls up when it dies and travels, rolling in the wind.

Local name

Traveller of the Wind

Folklore

Locally, years when many dried balls roll were taken as a sign of a long dry season to come.

Locator

Coordinates

33.3°N 44.4°E

The bed of a dried-up lake in a Middle Eastern desert

Record

When it dies, it rolls away as if alive.

For it sleeps on, year after year, until the rain comes.

A Middle Eastern desert, the bed of a dried-up lake.

On the cracked mud, the Rolling Herb appears.

When moist, it spreads slender silver-green leaves in a fan.

At its centre, a small white flower opens.

MoreFull specimen data — classification, scientific name, etymology▼

Classification

Classification & specimen data

Scientific name

Volvithamnus erraticus C. Iwabuchi, 1996

Taxonomy

Plantae › Angiosperms › Dicotyledons › Volvithamnales › Volvithamnaceae › Volvithamnus › erraticus

Voucher

AVF-018 · Holotype
Archive of Vanished Flora (AVF)

Conservation

✝ EX — Extinct Last seen 1999

Collector

T. Okabe
1994-07-19

Synonym

Volvithamnopsis erraticus A. Reinholt, 1992

Protologue (Latin)

Suffrutex nanus, foliis imbricatis, floribus solitariis nocte apertis. Typus: The bed of a dried-up lake in a Middle Eastern desert. Species iam extincta.

Discovered / Described

1994 / 1996

Height

8〜15cm

Life form

Perennial herb

Phyllotaxy

Alternate

Chromosome

2n = 26

Flowering

A brief flowering (a few days)

Pollination

Mainly self-pollinating

Substrate · pH

Gravelly, near-neutral

Elevation

300〜1,100 m

Etymology

Etymology of the name

VolvithamnusGENUS

volvrolling

erraticusEPITHET

erratwandering

✛

Addenda

later field notes

2026-06-24 · Brief Wet Phase

The lake bed darkens again for only three to five days after hard rain. In that interval, Volvithamnus erraticus spreads its silver-green leaves close to the mud and loosens its white flowers before dawn. By afternoon the perianth collapses, and saline wind erases the evidence. If a collector arrives half a day late, what remains no longer looks like an unnamed herb, but like the dry branchwork of a familiar halophytic annual.

2026-06-24 · Pollination and Selfing

The flowers are inconspicuous, yet on nights after rain, minute dipterans emerging from cracks in the mud seem to visit the damp floral disc. In years when such visits fail, the anthers bend inward against the stigma while still enclosed, completing self-pollination. The colony therefore depends on insects, but not absolutely. The whiteness seen the next morning is less the beginning of reproduction than the last visible trace of an event already ending.

2026-06-24 · Opening of the Dry Ball

The dry ball is not a revived plant. Because the inner and outer tissues of the stems and fruiting branches shrink at different rates, the dead body coils inward like a spring. When moistened again, hygroscopic tissue slowly lengthens, the ball opens shallowly, and seeds fall onto the mud. This sequence, wind transport followed by rain-triggered loosening, probably explains the small arc-shaped colonies found along the lake-bed margin.

Specimens of the same habitat