Pseuduvaria kwangtungensis (P.T.Li) Qing L.Wang & B.Xue, 2021
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publication ID |
https://dx.doi.org/10.3897/phytokeys.172.61025 |
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persistent identifier |
https://treatment.plazi.org/id/4FA7CCE5-DDFC-58B9-857D-84DFAF7252C1 |
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treatment provided by |
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scientific name |
Pseuduvaria kwangtungensis (P.T.Li) Qing L.Wang & B.Xue |
| status |
comb. nov. |
Pseuduvaria kwangtungensis (P.T.Li) Qing L.Wang & B.Xue comb. nov. Figs 1 View Figure 1 , 2 View Figure 2
Chinese name.
hai nan jin gou hua (海南金钩花)
Basionym.
Meiogyne kwangtungensis P.T.Li, Acta Phytotax. Sin. 14(1): 104. 1976.
Type.
China. Hainan: Bao-ting Hisen, Xing-long, 25 Jul. 1935, F. C. How 73305 (holotype: IBSC! [IBSC0003357]; isotypes, A [A00066602, photo!], IBK![IBK00190122], SN!).
Description.
Shrubs to 3-4 m tall, d.b.h. ca. 5 cm. Monoecious. Branches black, densely villous when young, glabrescent (Fig. 1A View Figure 1 ). Petiole 2-3 mm, villous (Figs 1A View Figure 1 , 2A View Figure 2 ); leaf blade oblong to elliptic, 6-18 × 2.5-5.5 cm, papery, adaxially glossy and glabrous except for pubescent midrib (Figs 1A View Figure 1 , 2A View Figure 2 ), abaxially glaucous and villous (Figs 1A View Figure 1 , 2B View Figure 2 ), midvein adaxially impressed, secondary veins ca. 10 on each side of midvein and prominent on both surfaces, base rounded to sometimes shallowly cordate, apex acuminate (Fig. 1A View Figure 1 ). Inflorescences axillary, with up to 2-3 flowers, only one flower at anthesis per inflorescence (Fig. 1A, B View Figure 1 ). Flowering peduncles 3-10 mm long, ca. 1 mm in diameter, villous (Fig. 1A, B View Figure 1 ). Sympodial rachides inconspicuous (often less than 5 mm), internodes poorly developed with several bracts. Flowering pedicels 15-30 mm long, ca. 1 mm in diameter, densely villous with erect hairs (Fig. 1B, C View Figure 1 ). Sepals partially connate, triangular to ovate, ca. 2 mm long, ca. 2 mm wide, glabrous adaxially, densely puberulous with appressed hairs abaxially (Fig. 1C View Figure 1 ). Outer petals ca. 7 mm long, ca. 5 mm wide, thin, broadly circular, glabrous adaxially, puberulous with appressed hairs abaxially and on the edge, cream-colored, without claws, dried with dense tiny golden glands adaxially (Figs 1C-E View Figure 1 , 2C View Figure 2 ). Inner petals ca. 8 mm long, 4 mm wide, rhombic, apex acute, base acute, ca. 1 mm thick, very densely puberulous with appressed hairs adaxially, densely puberulous with appressed hairs abaxially, cream-colored with purple tinge on adaxial surface of the blade in staminate flower (Fig. 1D, E View Figure 1 ), and purple in pistillate flower (Fig. 1F View Figure 1 ); basal claw ca. 3-4 mm long; glands paired on adaxial surface of inner petal, kidney-shaped to ellipsoid, surface smooth, raised (Fig. 1E View Figure 1 ); apical aperture absent. Flowers unisexual. Staminate flowers with androecium ca. 1 mm long, ca. 2 mm wide; stamens ca. 20-30 per flower, ca. 0.9 mm long, ca. 0.7 mm wide (Fig. 2D View Figure 2 ). Pistillate flowers with gynoecium ca. 1.5 mm long, ca. 1.3 mm wide; carpels 3 per flower, ca. 1.2 mm long, ca. 0.5 mm wide (Figs 1F, G View Figure 1 , 2E View Figure 2 ); ovules ca. 6-10 per carpel, bi-seriate; staminodes two (Fig. 1G View Figure 1 ). Fruiting peduncle 5-10 mm long, fruiting pedicel 20-50 mm (Fig. 1H View Figure 1 ). Monocarps 1-3, sessile or stipes to 3 mm long, ovoid, 20-37 cm long, 20-25 cm wide, very shallowly transversely constricted between seed when dry, densely tomentose, base rounded, apex apiculate (Figs 1H View Figure 1 , 2F View Figure 2 ). Seeds 5-10 per monocarp, in 2 series, yellowish, semi-lenticular to ellipsoid, 12 to 14 mm long, 5-8 mm wide, 3-5 mm high, with rugose and pitted testa and a grooved raphe that is more or less straight (Fig. 1I, K View Figure 1 ), endosperm rumination spiniform (Fig. 1L View Figure 1 ).
Distribution and habitat.
Known from several localities in Hainan province: Bai-cha Mountain in San-ya and Xing-long in Bao-ting, growing in rain forests, open woodland in valleys, at low elevations (ca. 600 m a.s.l).
Phenology.
Flowering from March to June; fruiting from June to August.
Additional specimens examined.
China. Hainan: San-ya, Bai-cha Mountain, 13 Aug. 1933, Z. Huang 33693 (IBSC0078951, SN); Bao-ting Hisen, Qi-xian Mountain, on mountain slopes under forest, alt. 549 m, 25 Apr. 2020, Q. L. Wang BT20200425001 (ATCH, IBSC); alt. 584 m, 28 May 2020, Q. L. Wang BT20200528001, BT20200528002 (ATCH, IBSC).
Preliminary IUCN conservation status.
CR D ( IUCN 2012). Pseuduvaria kwangtungensis was assessed as CR D by Qin et al. (2017). Prior to this study, P. kwangtungensis was only represented in herbaria by two collections from Hainan, China, collected in 1933 and 1935 respectively. One of the authors, Dr. Qing-Long Wang, has undertaken extensive field surveys in Hainan, and only found this species again in two localities in Qi-xian Mountain in Bao-ting, with three and four mature individuals respectively. Although it’s possible more individuals may be discovered with more extensive field surveys, we intended to maintain the CR category.
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