Glochidion lanyuense Gang Yao & S.X. Luo, 2020
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publication ID |
https://dx.doi.org/10.3897/phytokeys.159.54839 |
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persistent identifier |
https://treatment.plazi.org/id/4C3E179F-595E-5403-B738-DD639DFE5B8D |
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treatment provided by |
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scientific name |
Glochidion lanyuense Gang Yao & S.X. Luo |
| status |
sp. nov. |
4. Glochidion lanyuense Gang Yao & S.X. Luo sp. nov. Figures 4 View Figure 4 , 5B, D, F, H, J, K, M View Figure 5
Diagnosis.
The species is morphologically similar to G. lanceolatum , but differs by its female flowers usually solitary or rarely two in axillary, pedicel of female flowers and ovaries usually densely strigose, styles ovoid column and strigose at base, and fruits ca. 10 mm in diameter.
Type.
China. Taiwan, Taitung Hien, Lanyu Hsiang, Hongtoucun, on roadsides of broadleaf forest, 22°01'00"N, 121°33'27"E, at an elevation of 1-10 m, 16 September 1998, C.M. Wang 03521 (holotype: IBSC-0330741!).
Description.
Shrubs or treelets, monoecious; branchlets pubescent. Leaf blade oblong ovate, or elliptic, 6-10 × 3-4.5 cm, papery, slightly leathery, with apex acuminate or acute, and base broadly cuneate or rounded, glabrous in both surface; lateral veins 6-7 pairs, prominent beneath. Petiole 4-7 mm long, glabrous. Stipules broadly triangular, 1-1.5 mm long. Flowers in axillary solitarily or two. Male flowers: pedicles ca. 5 mm long, glabrous; sepals 6, oblong or ovate, biseriate, glabrous; stamens 3, 1-1.2 mm long. Female flowers: pedicles ca. 1 mm long, usually densely strigose; sepals 6, ovoid-triangular or ovate, biseriate, sparsely tomentose; ovary depressed globose, 5-6-locular, densely strigose; style connate into a cylindrical column, ca. 0.5 mm long, truncate at apex, densely strigose at base, 5-6-lobed apex, and then shallowly 2-lobed for each lobes. Capsules depressed globose, ca. 10 mm in diameter, sub-glabrous, 5-6-grooved.
Distribution and habitat.
The species is known only from its type locality, Lanyu island of Taiwan, China. It grows on roadsides of broadleaf forest at low altitude.
Etymology.
Glochidion lanyuense is named after its type locality, Lanyu island of Taiwan.
Taxonomic discussion.
Glochidion lanyuense is quite different from all of the other Glochidion species recorded from China, Japan, and the Philippines by its special characters of female flowers. It is similar to G. lanceolatum in habit, but differs (Table 1 View Table 1 ) in its female flowers which are usually solitary or rarely two in axillary (Figure 5J, K View Figure 5 ), pedicel of female flowers and ovaries are usually densely strigose (Figure 5B, D, F View Figure 5 ), style connate into a short cylindrical column (Figure 5D, H View Figure 5 ), stamens 3, capsules ca. 10 mm in diameter and 5-6-grooved (Figure 5M View Figure 5 ). In contrast, the species G. lanceolatum has multiple female flowers (usually 6-15) in supra-axillary cymes (Figures 2F View Figure 2 , 5I View Figure 5 ) or rarely axillary, pedicel of female flowers and ovaries are glabrous (Figure 5A, C, E View Figure 5 ), styles sub-conical Figure 5C, G View Figure 5 ), stamens 4-6, fruits 6-7 mm in diameter and shallowly 4- or 6-grooved or obscurely grooved (Figures 2G View Figure 2 , 5L View Figure 5 ). Additionally, as revealed in our previous palynological study ( Yao and Zhang 2016), pollen grains of G. lanyuense (recorded as Glochidion sp.3 in Yao and Zhang 2016) were much larger in size (P = 21.01 μm, E = 21.12 μm), 4-colporate in aperture system, and rugulate in exine ornamentation. While pollen grains of G. lanceolatum were smaller in size (P = 17.25 μm, E = 15.47 μm), 3-4-colporate, and regular reticulate in exine ornamentation, all of these characters are also consistent with the observation of Deng (1992). The rugulate ornamentation observed in pollen grains of the new species seems to be very different from those of other Taiwanese Glochidion species observed previously ( Deng 1992; Yao and Zhang 2016).
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