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Table 1.

Taxon sampling information and DNA sequences used for phylogenetic analysis.

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Fig 1.

The ML consensus tree of seven taxa based on two molecular markers (ITS1-5.8S-ITS2 and rps16).

Numbers at the nodes are ML bootstrap values from 1000 replicates. Red filled round bullets indicate new species in the current study, and blue filled round bullets indicate previously recorded species.

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Fig 2.

Comparison of reproductive characters.

Ovaries: A1. P. gaudichaudii; A2. P. arenaria. A3. P. vanphongensis; A4. P. phuquocensis; A5. P. chungana; A6. P. lignosa; A7. P. stylosa. Stipules: B1. P. gaudichaudii; B2. P. arenaria; B3. P. phuquocensis; B4. P. vanphongensis; B5. P. chungana; B6. P. lignosa; B7. P. stylosa. Photographs by V.T. Tran, T.T. Vinh.

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Fig 3.

Field photos of Polycarpaea vanphongensis V.T. Tran, H.T. Truong, N.V. Binh sp. nov.

A. Habit. B. Section of the stem with pseudoverticillate leaves. C. Internode with stipules. D. Leaves. E. Inflorescence. F, H. Bracts. G. Flower cluster. I. Sepal. J. Petal with stamen. K. Gynoecium. L. Capsule. Photo by V. T. Tran, H. T. Truong.

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Fig 4.

Holotype of Polycarpaea vanphongensis V.T. Tran, H.T. Truong, N.V. Binh.

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Fig 5.

Field photos of Polycarpaea phuquocensis V.T. Tran, H.T. Truong, N.V. Binh sp. nov.

A. Habit; B. Section of the stem with pseudoverticillate leaves; C. Stipule; D. Inflorescence. E. Bracts; F. Opening Flower; G Sepal; H. Petal; I. Dry Gynoecium; L. Capsule. Photo by V. T. Tran, T. T. Vinh.

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Fig 6.

Holotype of Polycarpaea phuquocensis V.T. Tran, H.T. Truong, N.V. Binh.

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Fig 7.

Field photos of Polycarpaea chungana V.T. Tran, H.T. Truong, N.V. Binh sp. nov.

A. Habit; B. Section of the stem with pseudoverticillate leaves; C. Flowers; D-E. Bracts; F. Stipule; G. Sepal; H. Petal; I. Fresh gynoecium; J. Dry Gynoecium. Photo by V. T. Tran, T. T. Vinh.

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Fig 8.

Holotype of Polycarpaea chungana V.T. Tran, H.T. Truong, N.V. Binh.

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Table 2.

Morphological comparison between Polycarpaea vanphongensis sp. nov., Polycarpaea phuquocensis sp. nov. and P. gaudichaudii, P. arenaria.

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Table 2 Expand

Table 3.

Morphological comparison between Polycarpaea chungana sp. nov. and P. lignosa.

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