Grewia piscatorum Hance

Lin, Chou-Yi, Chang, Chih-Yi, Wang, Chiu-Mei, Tzeng, Hsy-Yu & Tseng, Yen-Hsueh, 2025, Grewia kentingensis (Malvaceae, Grewioideae), a new species from Taiwan, PhytoKeys 253, pp. 155-176 : 155-176

Grewia piscatorum Hance in Ann. Sci. Nat., Bot., sér. 5, 5. 208. 1866.

Figs 1 B , 2 B , 3 B , 4 , 9

Type.

China • Fokien province: Lamyet island , 1860, Swinhoe s. n. in Herb. Hance 6527 (lectotype, designated here: BM [barcode BM 000795018 as image!]; isolectotype, K [barcode K 000686751 as image!]) .

Notes.

In the protologue, Hance (1866) cited a Swinhoe collection that he assigned one of his own collection numbers (“ Herb. propr., no. 6527 ”). Hance (1866) did not unequivocally state that he based the name on a single specimen and since there are duplicates of this Hance number in BM ( BM 000795018) (Fig. 9 ) and K (K 000686751), we designate a lectotype for Grewia piscatorum . The sheet selected is in Hance’s herbarium ( BM), and it is the duplicate with relatively more leaves and flowers.

Description.

Erect to ascending shrubs, ca. 1–2 m tall; young branchlets scabrous, older branchlets nearly glabrous. Leaf blades elliptic, obovate, ovate to rhomboid-ovate, 0.7–7.8 cm long, 0.5–5.5 cm wide, apex acute, obtuse to rounded, base cuneate to obtuse, 3 - nerved, margin serrulate to biserrulate, nearly glabrous, stellate hairs sparsely distributed along the veins on both surfaces; petioles 1.3–13.4 mm, sparsely stellate hairy; stipules linear, 2.4–5.1 mm long. Inflorescences leaf-opposed or rarely axillary, umbellate; peduncles 3.1–17.2 mm long, 6 to 15 flowers, pedicels 3.5–8.8 mm long; bracts linear, 1.4–2.6 (– 3.0) mm long. Flowers bisexual, functionally unisexual male or functionally unisexual female; bisexual flowers 14.8–18.5 (– 20.2) mm diam.; male flowers 14.2–18.8 mm diam.; female flowers 9.4–14.6 mm diam. Sepals (4) 5 (6), narrowly oblong to oblong, bisexual flowers 7.5–10.8 mm long, 2.4–4.1 mm wide, male flowers 7.3–8.4 mm long, 2.1–3.0 mm wide, female flowers 4.5–5.7 mm long, 1.4–2.0 mm wide, apex acute, abaxial surface yellowish green, stellate – pubescent, adaxial surface white, glabrous. Petals (4) 5 (6), oblong to ovate, apex rounded, bisexual flowers 2.2–3.3 mm long, 0.9–1.2 mm wide, male flowers 2.1–2.9 mm long, 0.9–1.2 mm wide, female flowers 1.5–2.5 mm long, 0.6–1.0 mm wide; nectaries present at the base of adaxial surface, 0.8–1.3 mm diam., surrounded by ciliate hairs. Androgynophore cylindrical, bisexual flowers 1.1–1.6 mm long; male flowers 1.1–1.5 mm long; female flowers 0.9–1.2 mm long, glabrous, ciliate hairs only at the apex. Ovary globose to oblate, pubescent, bisexual flowers 1.2–1.4 mm diam.; male flowers 1.2–1.5 mm diam.; female flowers 0.9–1.3 mm diam. Bisexual flowers with 103–118 stamens, filaments white, glabrous, 2.4–6.8 mm long, anthers dehiscing longitudinally; style 3.6–5.4 mm long, glabrous, stigma 4 - lobed, each lobe dentate at apex. Male flowers with 70–88 stamens, filaments white, glabrous, 2.1–4.7 mm long, anthers dehiscing longitudinally; style 3.1–4.1 mm long, glabrous, stigma 4 - lobed, each lobe dentate at apex. Female flowers with 58–102 stamens, filaments white, glabrous, 0.5–1.5 mm long, anthers white, always indehiscent; style 1.8–2.6 mm long, glabrous, stigma 4 - lobed, each lobe dentate at apex. Fruits drupaceous, usually 4 - lobed, fruit lobe 4.4–6.4 mm diam., globose, puberulent to nearly glabrous, red when mature.

Phenology.

Flowering from May to September and fruiting from June to October.

Distribution and habitat.

Distributed in Fujian Province and Hainan Province in China and in Taiwan on the coastal areas of Kinmen and Lienchiang Counties.

Palynology.

Pollens grains are tricolporate, prolate, 42.8–47.8 × 27.4–31.0 μm. The exine is reticulate, with muri 0.4–0.7 μm wide and lumen size 1.1–4.0 μm. Perforations present in the lumen, 0.04–0.26 μm.

Specimens examined.

China. Fujian Province • Fuzhou City, Tangyu , 24 May 1964, T. H Chen 493 ( AU) • Fuzhou City, Yemayu , 31 May 1964, T. H Chen 515 ( AU) ; Fuzhou City, Zhuyu , 17 May 1963, T. H Chen 1561 ( AU) • Xiamen City, Nanputuo , 20 Jul 1954, J. C. Lin 3857 ( AU) . Hainan Province • Dongfang City, seacoast of Dingjiao village , 20 Aug 1936, S. K. Lau 27727, 27730 ( IBSC) ; Sanya City, Xigu island , 3 Aug 2018, H. L. Hou 92038 ( AU) . Taiwan. Kinmen County • Brave Fortress , 24 Jun 2017, S. W. Chung 12988 ( TAIF) • Caicuo Trail , 2 Jun 2019, C. T. Lu et al. 2515 ( TNM) • Doumen to Taiwu Mountain , 22 Jul 2007, C. M. Wang 10497 ( TNM) • Fengshang , 20 May 2009, J. S. Shiu & Y. L. Hsueh H 315 ( CHIA) • General’s Spring , 28 May 2023, C. Y. Lin 22 ( TCF) • Jiugong Pier , 25 May 2002, C. M. Wang 5611 ( TNM) • Ibid., 7 Sep 2021, C. Y. Chang et al. 3539 ( TNM) Ibid., 28 May 2023, C. Y. Lin 17 ( TCF) • Jiugong Tunnel to shore-line road , 28 May 2023, C. Y. Lin 20 ( TCF) • Liaoluo , 22 May 2017, T. C. Hsu 9131 ( TAIF) • L 36 Fortress , 25 May 2024, C. Y. Lin et al. 85 ( TCF) • Mashan Observation Post , 26 Aug 2015, C. Y. Chang et al. 724 ( TCF, TNM) • Ibid., 29 May 2023, C. Y. Lin 24 ( TCF) • Paichushan to Huotou , 10 Jun 1999, S. T. Chiu 5386 ( TNM) • Qilinshan , 25 May 2024, C. Y. Lin et al. 86 ( TCF) • Qingyuan Lake , 9 Aug 2002, I. H. Chiang 120 ( TAI) • Shuitou Pier , 28 May 2023, C. Y. Lin 21 ( TCF) • Taiwu Mountain , 27 Jul 2005, K. C. Chen s. n. ( TAIF) • Ibid., 15 Jun 2006, C. H. Chen 7283 ( TNM) • Ibid., 4 Jun 2016, S. W. Chung 12534 ( TAIF) • Taiwu nursery , 22 Jul 2007, C. M. Wang 10519 ( TNM) • Tashan , 14–17 May 2010, F. Y. Lu et al. H 2794 ( CHIA) • Tzuhu , 25 Jul 2005, K. C. Chen s. n. ( TAIF) • Tzuti , 25 Jul 2005, K. C. Chen s. n. ( TAIF) • Wuhu Mountain , 13–16 Jul 2009, F. Y. Lu et al. 1015 ( CHIA) • Xiyuan beach to Chengkung Fortress , 29 May 2023, C. Y. Lin 23 ( TCF) • Zhaishan Tunnel , 25 May 2024, C. Y. Lin 80 ( TCF) . Lienchiang County • Beihai Tunnel , 19 Jul 2008, C. M. Wang 12180 ( TNM) • Chengkungshan , 27 Aug 2007, T. W. Hsu 13020 ( TAIE) • Chiukueishan , 27 Aug 2001, Y. L. Huang et al. 816 ( TAI) • Daping to lighthouse , 30 May 1994, T. Y. Liu & H. L. Ho 653 ( TNM) • Dapu Inscription , 9 Sep 2007, C. M. Wang & C. P. Lu 10690 ( TNM) • Fuzheng , 30 Jul 1999, S. H. Su 624 ( TAI) • Jinsha , 1 Jul 1999, S. H. Su 352 ( TAI) • Dawo Mountain , 16 Sept 2014, S. W. Chung 11782 ( TAIF) • Kunqiu Trail , 17 Oct 2017, C. Y. Chang 1473 ( TCF, TNM) • Leishan , 29 Aug 2007, T. W. Hsu 13079 ( TAIE) .

Figures

Figure 1. Habit of taxa assigned to Grewia sect. Glomeratae Burret in Taiwan. A Grewia kentingensis Y. H. Tseng, Chih Y. Chang & C. Y. Lin B Grewia piscatorum Hance C Grewia rhombifolia Kaneh. & Sasaki D Grewia biloba G. Don var. biloba.

Figure 2. Comparison of morphological characters. A Grewia kentingensis Y. H. Tseng, Chih Y. Chang & C. Y. Lin B Grewia piscatorum Hance 1 leaves 2 bisexual inflorescence 2 ' female inflorescence 3 bisexual flower 3 ' female flower 4 sepal (bisexual) 4 ' sepal (female) 5 petal (bisexual) 5 ' petal (female) 6 bisexual flower (sepals and petals removed) 6 ' female flower (sepals and petals removed) 7 fruit (left: overhead view; right: side view).

Figure 3. Comparison of pollen morphology of four Grewia taxa. A Grewia kentingensis Y. H. Tseng, Chih Y. Chang & C. Y. Lin B Grewia piscatorum Hance C Grewia rhombifolia Kaneh. & Sasaki D Grewia biloba G. Don var. biloba 1 equatorial view 2 colporate view 3 polar view 4 surface sculpture.

Figure 4. Variation in leaf size of Grewia piscatorum Hance. A variation in leaf size at different positions on the same branchlet B leaves near the distal end of a branchlet C leaves near the proximal end of a branchlet.

Figure 9. Lectotype of Grewia piscatorum Hance, Swinhoe s. n. in Herb. Hance 6527 (BM 000795018).