Styrax zhejiangensis Hwang (Hwang 1983: 75)

Ruan, Yu-Qing, Yu, Yu-Long, Yu, Fen, Deng, Guo-Xing, Liu, Yu-Lin, Wu, Xue-Hui & Tang, Ming, 2019, Reinstatement of the Chinese endemic species Styrax zhejiangensis, PhytoKeys 133, pp. 105-113 : 105

Styrax zhejiangensis Hwang (Hwang 1983: 75) Fig. 1A , 3 , 5A1, B1, C1, D1

Type.

CHINA. Zhejiang: Jiande, northeast of Long River, along stream, 27 June 1958, X. Y. He 29344 (lectotype, here designated, IBSC0002732!; isolectotype IBSC0497542!; isolectotype HHBG-HZ044271!; isolectotype NAS00072216!).

Description.

Shrubs, 1.5 –3(– 7) m tall, often branched at base, deciduous. Branchlets subterete, brown to grayish brown, glabrous. Leaves alternate but subopposite on basal part of branchlet; leaf blade broadly elliptic to ovate-oblong, 2.5-8.0 × 2.0-5.0 cm, papery, adaxially glabrous, abaxially glabrous but veins sparsely stellate-villous, base broadly cuneate to rounded, margin denticulate to subentire, apex acute, secondary veins 5 to 10 pairs, tertiary veins reticulate; adaxially plane or slightly sunken, abaxially raised. Petiole: those of upper leaves 1-3 mm, those of middle nearly sessile. Pedicel 7-13 mm long, densely white-stellate-tomentose; Flowers solitary, axillary, opening simultaneously with leaves. Calyx 5-8 × 5-10 mm, membranaceous; teeth 5 or 6, deltoid, unequal, 1.0-2.5 mm, apex white-glandular-dotted. Corolla diameter 4.0-5.5 cm, white, tube 3-4 mm long; lobes 6 to 8, elliptic-obovate, 1.8-2.7 × 1.0-1.6 cm. Stamens 13 to 16, 10-12 mm long, shorter than corolla; filaments 5-8 mm long, basally densely white-stellate-pubescent; anthers 4-5 mm long. Fruit solitary, axillary, ovoid, 1.8-2.0 × 1.0-1.2 cm, densely gray-stellate-pubescent, apex shortly pointed. Seeds ovoid-ellipsoid, irregularly rugose, sparsely or densely white-stellate-pubescent.

Distribution and habitat.

Styrax zhejiangensis is only found in Jiande, Zhejiang Province, distributed in Taohuawu, Long River Forest Area ( Fig. 2 ). It grows in sparse forests or at forest margins at elevations between 130 and 230 m a.s.l.

Phenology.

Flowering in early April and fruiting in August and September.

Additional specimens examined.

CHINA. Zhejiang: Jiande, G.Y. Li et al. L 0150 (PE); G.Y. Li et al. L 0154 (PE); Y.Q. Ruan & Y.L. Liu RL 31 (JXAU); Y.Q. Ruan & Y.L. Liu RL 46 (JXAU).

Figures

Figure 1. Lectotype sheet of Styrax zhejiangensis, China, Zhejiang, Jiande, X. Y. He 29344 (IBSC) (A) and holotype sheet of S. macrocarpus, China, Hunan, Yizhang, Mang mountain, W. C. Cheng s. n. (PE) (B).

Figure 2. Distribution map of Styrax zhejiangensis ([INSERT FIGURE 003]) and S. macrocarpus.

Figure 3. Styrax zhejiangensis (Jiande, Zhejiang, China) A habitat and habit B inflorescence C leaf blades D flower (top view) E flower (back view) F flower (side view) G opened flower H corolla lobes I sepals (two sepals pulled apart at the lobe margins of one calyx) J stamens. Photographed by Yu-Qing Ruan and Ming Tang.

Figure 5. Morphological comparison between Styrax zhejiangensis (A 1, B 1, C 1, D 1) and S. macrocarpus (A 2, B 2, C 2, D 2). A 1, A 2 Flower B 1, B 2 corolla lobes C 1, C 2 stamens D 1, D 2 seed (Note the enlarged stellate trichomes in the red circle in figure D 1). Photographed by Yu-Qing Ruan and Ming Tang.