Artabotrys crassifolius Hook.f. & Thomson

Chen, Junhao & Eiadthong, Wichan, 2020, New species and new records of Artabotrys (Annonaceae) from peninsular Thailand, PhytoKeys 151, pp. 67-81 : 67

Artabotrys crassifolius Hook.f. & Thomson

Artabotrys crassifolius Hook.f. & Thomson, Fl. Brit. India 1: 54 (1872). Type: Peninsular Malaysia. Malacca, Griffith s.n. [EIC 426] (lectotype: K [K000607645], designated in Sinclair (1955)).

Distribution and habitat.

Singapore, Peninsular Malaysia, peninsular Thailand (Fig. 6 ) and probably Myanmar (see notes), in lowland rain forests.

Specimen examined.

Peninsular Thailand. Trang Province: Palian District, Lam Plok Waterfall, ca. 20 m elev., 4 May 2010, W. Eiadthong 2010-1 (BK, BKF).

Notes.

The protologue for A. crassifolius cites a specimen from Martaban in Myanmar. In addition, a regional checklist ( Kress et al. 2003) and a forest flora ( Kurz 1877) indicate the presence of this species in Tenasserim (Taninthayi), Myanmar. However, Turner (2015) was unable to trace the syntype or any other specimen of this species from Myanmar; our attempts to trace those specimens were likewise in vain. The occurrence of A. crassifolius in Myanmar therefore requires future verification. Artabotrys crassifolius can be distinguished from other species in Thailand as its young twigs, flower pedicels and lower surface of sepals have a dense covering of long appressed hairs that is visible with the naked eye. In Thailand, this species is currently known from a single gathering from Trang, which exhibits the unique indumentum mentioned earlier and has monocarps with shape and size matching A. crassifolius . The specimens of this gathering were previously filed as ' Artabotrys indet’ and only recently identified for the Flora of Thailand project. Outside of Thailand, A. crassifolius is widespread in Peninsular Malaysia but restricted to the Central Catchment Nature Reserve and Bukit Timah Nature Reserve in Singapore.

Figures

Figure 6. Distributions of A. crassifolius, A. insurae, A. longipetalus and A. pleurocarpus in peninsular Thailand. Only the region in peninsular Thailand is shown; adjacent areas in Peninsular Malaysia and Myanmar are removed.