Artabotrys spathulatus J. Chen, Chalermglin & R. M. K. Saunders 2018
- Dataset
- Two new species and two new records of Artabotrys (Annonaceae) from Thailand
- Rank
- SPECIES
- Published in
- Chen, Junhao, Chalermglin, Piya, Saunders, Richard M. K. (2018): Two new species and two new records of Artabotrys (Annonaceae) from Thailand. PhytoKeys 95: 71-81, DOI: http://dx.doi.org/10.3897/phytokeys.95.23434, URL: http://dx.doi.org/10.3897/phytokeys.95.23434
Classification
- kingdom
- Plantae
- phylum
- Tracheophyta
- class
- Magnoliopsida
- order
- Magnoliales
- family
- Annonaceae
- genus
- Artabotrys
- species
- Artabotrys spathulatus
description
Description. Climbers, to 20 m in height. Twigs drying brown, glabrous to sparsely hairy. Leaf laminas 9.6 - 18.1 cm long, 3 - 4.5 cm wide, oblong-elliptic, apex acuminate, base cuneate or decurrent, chartaceous, subglabrous both ab- and adaxially; midrib glabrous to sparsely hairy abaxially, glabrous adaxially, prominent and raised on both surfaces; secondary veins 6 - 14 pairs per leaf, visible on both surfaces; tertiary venation reticulate, visible on both surfaces; petioles 2 - 6 mm long, ca. 1 mm in diameter, glabrous to sparsely hairy. Inflorescence hooks recurved, laterally compressed, with 1 or 2 flowers; flowering pedicels ca. 10 mm long, ca. 1 mm in diameter, subgla brous. Sepals 4 - 5 mm long and wide, triangular, subglabrous both ab- and adaxially, venation indistinct. Outer petals with externally distinct blades and claws; blades 8 - 10 mm long, 7 - 8 mm wide, deltoid, flat, sparsely hairy both ab- and adaxially; claws ca. 5 mm long and wide, broadly rhomboid, densely hairy abaxially, glabrous adaxially. Inner petals with externally distinct blades and claws; blades 6 - 7 mm long, 4 - 5 mm wide, broadly spathulate, strongly concave, sparsely hairy both ab- and adaxially; claws ca. 5 mm long, ca. 3 mm wide, narrowly rhomboid, densely hairy abaxially, glabrous adaxially. Stamens numerous per flower, ca. 1 mm long, ca. 1 mm wide; apex of connectives truncate. Carpels ca. 30 per flower, ca. 1 mm long, ca. 1 mm wide; ovaries ovoid; stigmas ellipsoid, extending centrifugally. Fruiting pedicels unknown. Monocarps (in fresh material) up to 30 per fruit, 19 - 26 mm long, 14 - 18 mm wide, obovoid, strongly beaked (beak ca. 2 mm long), sessile. Seeds 2 per monocarp, plano-convex, 12 - 14 mm long, 9 - 11 mm wide.
diagnosis
Diagnosis. Similar to Artabotrys tanaosriensis J. Chen, Chalermglin & R. M. K. Saunders except with flat (vs. undulate) outer petal blades, broadly rhomboid (vs. broadly ovate) outer petal claws, broadly spathulate and strongly concave (vs. rhomboid and undulate) inner petal blades and strongly beaked monocarps.
distribution
Distribution and habitat. So far only known from Thailand (Fig. 5). Inhabits tropical rain forests at the base of limestone hills; ca. 100 m elev.
etymology
Etymology. The specific epithet reflects the morphology of the inner petals.
materials_examined
Type. THAILAND: Krabi Province, Mueang Krabi District, Phruksa Sawan limestone hill, 100 m elev., 15 Mar 2015, P. Chalermglin 580315 (holotype: BKF!; isotypes: L!, QBG!).