Polyalthiopsis Chaowasku, Ann. Bot. Fennici 55: 130. 2018.

Xue, Bine, Ding, Hong-Bo, Yao, Gang, Shao, Yun-Yun, Fan, Xiao-Jing & Tan, Yun-Hong, 2020, From Polyalthia to Polyalthiopsis (Annonaceae): transfer of species enlarges a previously monotypic genus, PhytoKeys 148, pp. 71-91 : 71

Polyalthiopsis Chaowasku, Ann. Bot. Fennici 55: 130. 2018. Figs 2 , 3 , 4 , 5

Type species.

Polyalthiopsis floribunda (Jovet-Ast) Chaowasku - Polyalthia floribunda Jovet-Ast, Notul. Syst. 9: 75. 1940. - Huberantha floribunda (Jovet-Ast) I.M.Turner, Webbia 71: 229. 2016. - Type: Vietnam. Phanrang Prov., Tra Ca, 10 March 1924, Poilane 10052 (holotype P [barcode no. P00411080]; isotypes A[barcode no. A00351290], BO?, CMUB, HN, K[barcode no. K000608178], L[barcode no. L3728819], P [barcode no. P00411081; P00411082]), in flower.

Description.

Medium-sized to large trees. Young twigs glabrous. Leaves petiolate, blade elliptic, with glandular dots observable when dry, base cuneate, apex acute to bluntly (caudate-)acuminate; petiole with transverse striations when dry; upper surface of midrib raised in living plants, becoming slightly sunken when dry, lower surface of midrib raised; secondary veins rather faint in living plants, becoming slightly raised on both sides when dry, leaf venation brochidodromous; tertiary veins reticulate. Flower(s) in 1- to 5-flowered inflorescences, bisexual, pedicellate; inflorescences axillary, peduncle inconspicuous, bracts present. Sepals broadly ovate-triangular. Petals membranous-papyraceous to leathery. Outer petals elliptic-ovate or linear-lanceolate. Inner petals (narrowly) elliptic-ovate or linear-lanceolate. Stamens numerous per flower, connective truncate, covering thecae. Carpels numerous per flower; ovaries with 1 or more line(s) of hairs; stigma terete; ovule(s) 1 or 2 per ovary, sub-basal or lateral. Monocarps oblong to rhomboidal or cylindrical, stipitate, glabrous. Seed(s) 1or 2 per monocarp, cylindrical, surface smooth, raphe broadly sunken and partially slightly raised in middle, endosperm ruminations lamelliform.

Distribution.

Three species, known from Xizang, Yunnan Provinces of China and Thừa Thiên-Hu, Ninh Thuận Provinces of Vietnam (Fig. 5 ).

Figures

Figure 2. Morphological comparison between Polyalthiopsis chinensis and P. verrucipes A type specimen of P. chinensis (Qinghai-Xizang Exped. 74 - 4451, PE) B infloresence of P. chinensis (Qinghai-Xizang Exped. 74 - 4451, PE) C type specimen of P. verrucipes (C. W. Wang 76321, A) D inflorescence of P. verrucipes (B. Xue & H. B. Ding 311, IBSC) E adaxial leaf surface of P. chinensis (Qinghai-Xizang Exped. 74 - 4451, KUN) F abaxial leaf surface of P. chinensis (Qinghai-Xizang Exped. 74 - 4451, KUN) G adaxial leaf surface of P. verrucipes (Yunnan Exped. 9527, KUN) H abaxial leaf surface of P. verrucipes (Yunnan Exped. 9527, KUN).

Figure 3. Morphology of Polyalthiopsis verrucipes comb. nov. A trunk, showing greyish bark B a branch, showing the leaf lamina C adaxial leaf surface, showing the raised midrib D close-up of the abaxial surface of dried leaf, showing glands E petiole with transverse striations when dried F lateral view of the flower G top view of the flower H bottom view of the flower I adaxial and abaxial view of the stamen J carpel K longitudinal section of a developing carpel, showing two developing ovules L developing young fruits M single dried monocarp, showing the two seeds 01187409 (C. W. Wang 76321, PE) N cylindrical seed, showing longitudinal groove around circumference (C. W. Wang 76321, PE). - Photos: A, C-E, I-N, by Bine Xue; B, by Yun-Hong Tan; G-H by Hong-Bo Ding.

Figure 4. Polyalthiopsis verrucipes comb. nov. A flowering branch B close-up of adaxial surface of leaf, showing glands C close-up of leaf petiole, showing the transverse striations on dried petiole D lateral view of the flower E adaxial view of the flower F sepal G outer petal H inner petal I stamen J carpel K longitudinal section of the developing carpel, showing two lateral ovules L a dried monocarp M a seed. Drawn by Ding-Han Cui. (A-K from B. Xue & H. B. Ding XB 311, IBSC; L, M from C. W. Wang 76321, PE)

Figure 5. Distribution of Polyalthopsis chinensis, P. floribunda and P. verrucipes.