Dodson’s Dicliptera was described in 1977, it is known from just four collections that were made in a private forest of the Río Palenque Biological Station in the Los Rios Province of Ecuador.
The species was apparently last found in 1986 or maybe sometimes later, but since it hasn’t been found during any recent search it is now considered possibly extinct.
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edited: 13.11.2021
Inconspicuous Hypoestes (Hypoestes inconspicua)
The Inconspicuous Hypoestes was described in 1877, it was endemic to the island of Rodrigues, Mascarene Islands.
The plant had a trailing habit with very small, indeed inconspicuous leaves.
The Inconspicuous Hypoestes is now considered extinct.
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edited: 03.11.2020
St John’s-Wort-leaved Strobilanthes (Strobilanthes hypericoides)
This species was described in 1995 based on material that had been collected in 1926 in the Kandy District of Sri Lanka, it is still only known from the type material and may well be extinct.
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References:
[1] M. D. Dassanayake; W. D. Clayton: A Revised Handbook to the Flora of Ceylon 12. CRC Press 1998 [2] MOE 2012. The National Red List 2012 of Sri Lanka; Conservation Status of the Fauna and Flora. Ministry of Environment, Colombo, Sri Lanka. VIII + 476 pp
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edited: 23.03.2018
Gardner’s Strobilanthes (Strobilanthes gardneriana)
Gardner’s Strobilanthes was described in 1860, it is, or rather was, endemic to the island of Sri Lanka.
The species is possibly extinct.
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edited: 25.05.2021
The Natal Barleria is known only from the type material that was collected in 1890 at Verulam, a small town in KwaZulu-Natal, South Africa.
The type locality has been completely transformed to commercial sugarcane cultivation; the plant has not been found since the type collection and is most likely extinct now.
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edited: 16.05.2022
Bloodstained Ptysiglottis (Ptyssiglottis sanguinolenta)
The Bloodstained Ptysiglottis was described in the year 1791. The plant occurred in the districts of Colombo, Galle, and Ratnapura in the south of the island of Sri Lanka, where it grew with prostrate stems on wet rocks in several rivers of the rain-soaked lowland forests.
The species was repeatedly searched, but it could never be relocated – it is with nearly absolute certainty extinct.
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References: [1] M. D. Dassanayake; W. D. Clayton: A Revised Handbook to the Flora of Ceylon 12. CRC Press 1998
[2] MOE 2012. The National Red List 2012 of Sri Lanka; Conservation Status of the Fauna and Flora. Ministry of Environment, Colombo, Sri Lanka. VIII + 476 pp
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edited: 16.02.2013
Quito Dicliptera (Dicliptera quitensis)
This terrestrial, herbaceous plant is known only from the type material which was collected in 1933 on a river bank in the vicinity of the city of Quito, the capital of Ecuador.
The species was never found again since and is almost for certain extinct.
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edited: 19.06.2020
Caudated Strobilanthes (Strobilanthes caudata)
This species is, or maybe was, endemic to the island of Sri Lanka; it is now, however, considered extinct.
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edited: 25.05.2021
Rodrigues Hypoestes (Hypoestes rodriguesiana)
The Rodrigues Hypoestes was described in 1877, it was endemic to the island of Rodrigues in the Mascarene Islands, where it apparently was restricted to Mont Malartic, the island’s highest mountain.
The species is now extinct.
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edited: 03.11.2020
Clavate Dicliptera (Dicliptera clavata)
The genus Dicliptera contains about 300 species, two of which occurred on the Society Islands in French Polynesia
One of these two species, Forster’s Dicliptera (Dicliptera forsteriana Nees) (see depiction below) is more widely distributed along the Society Islands and apparently can still be found today on the islands of Bora Bora, Huahine, Ra’iatea, and Taha’a, while it appears to be extinct on Tahiti and Mo’orea. It apparently did furthermore occur on the island of Rapa in the Austral Islands.
The second species, the Clavate Dicliptera, was restricted to the island of Tahiti and is considered globally extinct.
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edited: 19.06.2020
Psychotria-like Justicia (Justicia psychotrioides)
The Psychotria-like Justicia was described in 1822, as far as I’m aware based on a herbarium specimen, the species was endemic to the island of Mauritius, Mascarene Islands.
The species is now considered extinct.
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edited: 07.05.2019