No other taxa included here.
Full conservation status analysis:
Psychotria birkishawiana is known from 23 specimen collections representing 19 unique occurrences in perhumid evergreen forest at 0--400 m elevation. The Extent of Occurrence (EOO) of the species is 7,290 km2, within the limits for Vulnerable under IUCN Red List Criterion B1; and the Area of Occupancy (AOO) is 68 km2, within the limits for Endangered under Criterion B2 (IUCN, 2012). Four of the 19 occurrences are within the well-protected Masoala National Park. The remaining fifteen occurrences are in unprotected areas. Two of the collection sites have degraded or disturbed forest habitats. Forested areas without formal protection in the vicinity of Masoala National Park are subject to degradation by small-scale slash and burn agriculture and resource exploitation, including logging, hunting and mining (Goodman et al., 2018). Five collection sites indicate watershed/headwaters/river basin drainages as habitat; two sites have coastal habitat. The four occurrences within Masoala National Park can be counted as one protected “location” (sensu IUCN, 2012, IUCN Standards and Petitions Committee, 2019), and the remaining, unprotected occurrences can be grouped into nine additional locations based on geographic clustering relative to the scale of threats, some of them at high risk for further disturbance and exploitation due to their water resources. With ten locations and given general habitat degradation in unprotected sites, the sensitive nature of watershed areas, and with no reason to assume that any of the unprotected sites is more likely to disappear than the others, the Red List status of Psychotria birkishawiana is assessed as Vulnerable, VU B1ab(iii)+2ab(iii).