Artabotrys tanaosriensis J. Chen, Chalermglin & R. M. K. Saunders 2018
- Dataset
- 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 tanaosriensis
description
Description. Climbers, to 20 m in height. Twigs drying grey-brown, glabrous to sparsely hairy. Leaf laminas 9.5 - 15.5 cm long, 2.3 - 4.0 cm wide, oblong-elliptic, apex acuminate, base cuneate or decurrent, chartaceous, glabrous both ab- and adaxially; midrib glabrous to sparsely hairy abaxially, glabrous adaxially, prominent and raised on both surfaces; secondary veins 8 - 12 pairs per leaf, visible on both surfaces; tertiary venation reticulate, visible on both surfaces; petioles 2 - 5 mm long, ca. 1 mm in diameter, glabrous to sparsely hairy. Inflorescence hooks recurved, laterally compressed, with 1 - 3 flowers; flowering pedicels 7 - 9 mm long, ca. 1 mm in diameter, glabrous. Sepals ca. 4 mm long, 4 - 6 mm wide, triangular, subglabrous both ab- and adaxially, venation indistinct. Outer petals with externally distinct blades and claws; blades 10 - 12 mm long, 7 - 8 mm wide, deltoid, undulate, sparsely hairy both ab- and adaxially; claws ca. 4 mm long, 6 - 8 mm wide, broadly ovate, densely hairy abaxially, subglabrous adaxially. Inner petals with externally distinct blades and claws; blades 7 - 10 mm long, 4 - 5 mm wide, rhomboid, undulate, sparsely hairy both ab- and adaxially; claws ca. 6 mm long, ca. 4 mm wide, rhomboid, densely hairy abaxially, glabrous adaxially. Stamens ca. 90 per flower, ca. 1 mm long, ca. 1 mm wide; apex of connectives truncate. Carpels 24 - 30 per flower, ca. 1 mm long, ca. 1 mm wide; ovaries ovoid; stigmas ellipsoid, extending centrifugally. Fruiting pedicels 10 - 11 mm long, ca. 2 mm wide, glabrous. Monocarps 8 - 30 per fruit, 15 - 20 mm long, 9 - 13 mm wide, ellipsoid, glabrous, slightly beaked (beak less than 1 mm long), drying with longitudinal ridges, subsessile or with stipes up to ca. 2 mm long. Seeds 2 per monocarp, plano-convex, ca. 16 mm long, ca. 8 mm wide.
diagnosis
Diagnosis. Similar to Artabotrys oblanceolatus Craib except with cuneate or decurrent (vs. rounded) leaf base, symmetrical (vs. asymmetrical) leaf base, externally distinct outer petal blades and claws, deltoid and undulate (vs. ovate and flat) outer petal blades, rhomboid and undulate (vs. ovate and flat) inner petal blades, shorter monocarps (1.5 - 2 cm vs. 2 - 2.5 cm), slightly beaked (vs. sharply beaked) monocarps and monocarps with shorter stipes (ca. 2 mm vs. ca. 4 mm).
distribution
Distribution and habitat. So far only known from Thailand (Fig. 5), but possibly also occurring in the adjacent Tanintharyi National Park in Myanmar. Inhabits tropical rain forests on lateritic soil; 150 - 1000 m elev.
etymology
Etymology. The specific epithet alludes to " Tanao Sri ", the Thai name of the Bilauktaung subrange of the Tenasserim Range where this species occurs.
materials_examined
Additional specimens examined (paratypes). Thailand: Prachuap Khiri Khan Province, Hua Hin District, Huai Sat Yai, Pa La-U Village, 17 Oct 2016, P. Chalermglin 591017 (BKF, HKU, L, QBG); Phetchaburi Province, Kaeng Krachan District, Huai Mae Phriang Village, 14 Feb 2015, P. Chalermglin 580214 (BKF, HKU, L, QBG).
materials_examined
Type. THAILAND: Phetchaburi Province, Kaeng Krachan National Park, Phanoen Thung Ranger Station, 1000 m elev., 25 Aug 2004, I. C. Nielsen 1911 (holotype: L! [barcode L 3729228]; isotype: AAU, n. v.; SING! [barcode SING 0115634]).