Thai Forest Bulletin (Botany)

Thaigardenia (Rubiaceae: Gardenieae), a new genus distributed from Thailand to South China

Sarawood Sungkaew — 2024-04-17

Identified as Gardenia over a century ago, three known species from Thailand to south China differ considerably from typical members of that genus, from which growth habits, aspects of branch architecture and corolla shape set them apart. They form a new genus, here named Thaigardenia, the species of which are scrambling to thicket-forming shrubs to sometimes treelets or small trees. They have typically unequal (asymmetric) development of each internode that offsets what began as opposite pairs of axillary buds (and potential axillary branches) from subtending leaf axils at the same level, and small infundibular corollas with insignificant tubular bases. In contrast, typical Gardenia are non-scrambling shrubs or trees, often have extra-axillary buds or branches that consistently continue to develop at the same level (i.e., remaining opposite); and showy hypocrateriform (salverform) corollas with elongate tubular bases. The unequal development of different sides of an internode that brings an initially opposite pair of axillary buds (branches) to different levels, so that they do not appear paired subsequently, is, as far as is known, unique and unknown in other Rubiaceae or opposite-leaved plants; this shared feature is a key synapomorphic character for species of the newly recognised genus.

Re-discovery of Fimbristylis tenera (Cyperaceae) in Thailand

Khanit Wangwasit — 2024-04-12

Fimbristylis tenera is re-discovered in Thailand and is described and illustrated. Part of the Fimbristylis key in the Flora of Thailand Cyperaceae account is emended to include F. tenera.

Apocynaceae of continental South-East Asia: new species, new records and new combinations

Michele Rodda — 2024-01-18

This paper makes necessary taxonomic and nomenclatural adjustments prior to publication of accounts of Apocynaceae (Asclepiadoideae, Periplocoideae, Secamonoideae) for the Floras of Thailand, Peninsular Malaysia, and Cambodia, Laos and Vietnam. It includes the publication of two new species, Gymnemopsis krabiensis and Gymnemopsis thailandica; new country records of Dolichopetalum kwangsiense, Dischidia antennifera, Gongreos curtisii and Vincetoxicum cissoides for Thailand and of Gongronema napalense for both Thailand and Myanmar; two new combinations in Gongreos; 10 new combinations and four new names in Secamone; three new combinations in Stephanotis; one new combination in Pseudosarcolobus; and 11 typifications.

Diplospora siamica (Rubiaceae) - a new record for the Flora of Vietnam

Trang Thanh Pham — 2024-01-08

Diplospora siamica is newly recorded for the flora of Vietnam. It was found in Muong La Nature Reserve, Son La Province, northern Vietnam. A description and colour photos of the species are provided. A key to Diplospora species in Vietnam is also given.