[Botany • 2020] Artabotrys longipetalus & A. insurae (Annonaceae) • New Species and New Records of Artabotrys from peninsular Thailand

 Artabotrys longipetalus J.Chen & Eiadthong, 

 A. insurae J.Chen & Eiadthong, 

in Chen et Eiadthong, 2020. 

 DOI: 10.3897/phytokeys.151.51643

Abstract

Two new species of Artabotrys (Annonaceae) are described from peninsular Thailand. Artabotrys longipetalus J.Chen & Eiadthong, sp. nov., is unique among Artabotrys species in Thailand in having linear petals, relatively long flower pedicels and sessile monocarps. Artabotrys insurae J.Chen & Eiadthong, sp. nov., resembles Artabotrys uniflorus (Griff.) Craib, but can be distinguished by its oblique leaf base, flat petal blades, apiculate anther connective apex and the presence of a monocarp stipe. In addition, two new records for the Flora of Thailand are reported, viz. Artabotrys crassifolius Hook.f. & Thomson and Artabotrys pleurocarpus Maingay ex Hook.f. & Thomson; both species are so far only known from peninsular Thailand. A key to the 20 species of Artabotrys in Thailand is provided.

Keywords: Annonaceae, Artabotrys, new records, new species, peninsular Thailand

Artabotrys insurae sp. nov.
A habit and leaves, showing caudate to acuminate leaf apex (C. Leeratiwong 18-1522) B oblique leaf base and inflorescence with hooked peduncle (C. Leeratiwong 18-1522) C flower, showing oblong-ovate outer petals and oblong-elliptic inner petals (C. Leeratiwong 18-1522) D fruit (C. Leeratiwong 17-1116).

Photos: C. Leeratiwong.

A, B Artabotrys longipetalus sp. nov. A habit and inflorescence (T. Insura 57) B flowers, showing linear petals with acute apex (T. Insura 57)
C, D Artabotrys tipuliferus C flowers, showing short flower pedicel and linear petals (S. Phusomsaeng 272) D fruit, showing short fruit pedicel and stipitate monocarps (T. Insura 56)
E, F Artabotrys multiflorus E flowers, showing lanceolate petals with acute to obtuse apex F hooked inflorescence with many flowers.

Photos: A, B, D T. Insura C Royal Botanic Garden Edinburgh E, F P. Chalermglin.

Junhao Chen and Wichan Eiadthong. 2020. New Species and New Records of Artabotrys (Annonaceae) from peninsular Thailand. PhytoKeys. 151: 67-81. DOI: 10.3897/phytokeys.151.51643