Trivalvaria, Miquel, 1865

Johnson, David M., Chaowasku, Tanawat, Murray, Nancy A. & Chalermglin, Piya, 2021, Three new species of Trivalvaria (Annonaceae) from Thailand, with a key to the Thai species, Phytotaxa 489 (1), pp. 79-86: 84-85

publication ID

http://doi.org/ 10.11646/phytotaxa.489.1.6

persistent identifier

http://treatment.plazi.org/id/03DB7B3F-037F-F017-C7EB-FE3DFE50050C

treatment provided by

Marcus

scientific name

Trivalvaria
status

 

Trivalvaria   in Thailand

With the addition of these new species, Thailand now appears to be the centre of Trivalvaria species   diversity. The Thai species, along with T. pumila   from Peninsular Malaysia, are distinguished in the following key.

Trivalvaria pumila   occurs throughout Peninsular Malaysia and may be expected in Thailand. Ridley (1915) reported it from Thailand as Ellipeia pumila King (1892: 27)   from the Koh Samui and Koh Pennan [= Pha-ngan] region on the basis of a collection by H.C. Robinson. We cannot locate his specimen. We consider T. pumila   a distinct species, as distinguished in the key, but van Heusden (1997) treated it a synonym of T. dubia   , and Turner (2009) considered T. pumila   a synonym of T. costata   . In the material we studied, T. pumila   was most similar to T. stenopetala   .

Trivalvaria costata   and T. dubia   are treated as distinct species here. Trivalvaria costata   s.str. ( Fig. 3D,E) is widespread in southeastern and Peninsular Thailand. The type of Trivalvaria dubia   is from the Andaman Islands. Specimens resembling the type of T. dubia   in their rounded petals and hairy anther connectives have been collected in Phuket Province in Peninsular Thailand ( Fig. 3F,G); these have slightly different indument and leaf shape from T. dubia   s.str.; additional material is required to determine if they represent a distinct taxon. One of these specimens was used in the molecular phylogenetic analysis by Chaowasku et al. (2020, as “ Trivalvaria sp. 1   ). Both the Andaman and Thai specimens are clearly distinct from T. costata   s.str.

The dome formed by the connivent inner petals in T. costata   has led to confusion of this species with T. macrophylla   ; the latter has larger flowers with dense silky pubescence on the inner petals and a greater number of carpels and monocarps ( Fig. 3A–C).

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Magnoliales

Family

Annonaceae

Loc

Trivalvaria

Johnson, David M., Chaowasku, Tanawat, Murray, Nancy A. & Chalermglin, Piya 2021
2021
Loc

T. stenopetala

Chaowasku & D. M. Johnson 2021
2021
Loc

Trivalvaria costata

Turner 2009
2009
Loc

Trivalvaria costata

Turner 2009
2009
Loc

Trivalvaria costata

Turner 2009
2009
Loc

T. costata

Turner 2009
2009
Loc

Trivalvaria pumila

Sinclair 1953
1953
Loc

T. dubia

Sinclair 1953
1953
Loc

Trivalvaria dubia

Sinclair 1953
1953
Loc

T. dubia

Sinclair 1953
1953
Loc

Trivalvaria dubia

Sinclair 1953
1953
Loc

T. dubia

Sinclair 1953
1953
Loc

T. dubia

Sinclair 1953
1953
Loc

Ellipeia pumila

King 1892: 27
1892
Loc

T. pumila

King 1892
1892
Loc

T. pumila

King 1892
1892
Loc

T. costata

King 1892
1892
Loc

T. pumila

King 1892
1892