A new species of Ardisia (Myrsinaceae) is described from the Malaysian state of Sabah in northern Borneo. Ardisia silamensis is a member of subgenus Pimelandra, and has been confused with the Peninsular Malaysian species A. solida, but differs in the indumentum type and distribution on the vegetative and especially on the floral parts, and the inflorescence bracts. The species is currently only known from ultramafic substrates on Mt Silam, and is assessed as Critically Endangered according to the IUCN criteria.

Ardisia silamensis, a new ultramafic species from Borneo; studies in Malaysian Myrsinaceae II

. Ardisia lammersiana (Myrsinaceae) and Psychotria leptothyrsa var. defretesiana (Rubiaceae) are described from the Conservation International Mamberamo River Expedition. The new plants are locally common understory shrubs from tributaries of the lower drainage, occurring primarily in seasonally flooded forest. Among the New Guinea species in subgen. Akosmos, Ardisia lammersiana is easily identified by its long peduncles (7.0–10.5 cm), long pedicels (13–20 mm), and white flowers. The second novelty (Psychotria leptothyrsa var. defretesiana) is distinguished by its architectural form, obtuse leaf-blades, erect panicles, and 3–4-ridged pyrenes.

https://bioone.org/journals/harvard-papers-in-botany/volume-14/issue-2/025.014.0209/New-Taxa-from-the-Mamberamo-River-of-Papua-Province-Indonesia/10.3100/025.014.0209.pdf

New Taxa from the Mamberamo River of Papua Province, Indonesia: Ardisia lammersiana (Myrsinaceae) and Psychotria leptothyrsa Var. Defretesiana (Rubiaceae)

﻿Abstract Ardisiawhitmorei Julius & Utteridge, sp. nov. (Primulaceae-Myrsinoideae), a member of ArdisiasubgenusStylardisia on account of the style protruding from the closed petals prior to anthesis, is herein described and illustrated as a new species. This new species is easily distinguished by the combination of the inflorescences with a slender rachis branched to two orders, the corolla lobes are abaxially glabrous with usually up to only two gland-dots near the apex and the brochidrodromous secondary veins with double loops near the margin.

﻿Ardisiawhitmorei (Primulaceae-Myrsinoideae), a new species from north east of Peninsular Malaysia

Ardisia argentiana and A. nagaensis from subgenus Tetrardisia are herein described and illustrated as new species. They are endemic to Borneo and the Indonesian province of Central Kalimantan and to the Malaysian state of Sarawak, respectively. Ardisia argentiana is unique in its linear-oblong leaves, with a long, acuminate-caudate apex, and finely serrulate margins, while A. nagaensis can be easily recognized by its elliptic-lanceolate leaves.

Two new species of Ardisia subgenus Tetrardisia (Primulaceae-Myrsinoideae) from Borneo.

. Ardisia hymenandroides (Myrsinaceae) is described from the Foja Mountains of Papua Province. The new species is distinguished by its resemblance to Hymenandra, monoaxial habit, apiculate anthers, and long-peduncled racemes.

Ardisia hymenandroides (Myrsinaceae), An Unusual Monoaxial Species from the Foja Mountains of West New Guinea

Twenty-seven new species, one new subspecies and five new varieties of Ardisia are described from the Flora Malesian region.

https://repository.naturalis.nl/pub/524694/BLUM2002047003003.pdf

New species of Ardisia (Myrsinaceae) from Malesia

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New species of Ardisia (Myrsinaceae) from Malesia