Polygonatum arisanense Hayata var. chingshuishanianum (S. S. Ying) C. T. Chao & Y. H. Tseng, 2019

Chien-Ti, Chao & Yen-Hsueh, Tseng, 2019, Revision of Polygonatum (Asparagaceae, Nolinoideae, Polygonateae) of Taiwan, PhytoKeys 117, pp. 99-118 : 108-109

2. Polygonatum arisanense Hayata var. chingshuishanianum (S. S. Ying) C. T. Chao & Y. H. Tseng comb. nov. Fig. 7 清水山黃精

Polygonatum chingshuishanianum S. S. Ying in Memoirs of the College of Agriculture, National Taiwan University 28(2): 42. 1988. Ying, Fl. Taiwan 5:61, 2000; Boufford et al., Fl. Taiwan 6:112, 2003. Type: Hualien county, Hsiulin township, Chingshuishan, 2300 m, 26 Jun 1988, S. S. Ying s.n. (holotype: NTUF!), syn. nov.

Polygonatum altelobatum sensu auct. Wang non Hayata, Icones Plantarum Formosanarum 5:229. 1915.

Perennial herbs.

Rhizome tuberous, 1.5-1.8 cm in diam. Stem straight, 10-30 cm long, purplish-green, base covered with scale leaf, caducous. Leaves deciduous, alternate, chartaceous to thinly coriaceous, 3-nerved, lanceolate to oblong-lanceolate, 5.5-7.5 cm long, 1.5-2.5 cm wide, apex obtuse, base obtuse and decurrent to the petiole base, entire, glabrous on both surfaces, petiole ca. 3 mm long, glabrous. Inflorescences solitary or two flowers, peduncle ca. 1.3 cm long. Flowers pendulous, pedicels 5.0-6.5 mm long, glabrous, articulated close to the flower, perianth tube 1-1.5 cm long, ca. 8 mm wide, base flattened, perianth segments 6, arranged into 2 whorled, each 3, triangular, ca. 5 mm long, ca. 5 mm wide, green with dark green strip, apex obtuse, floccose. Stamens 6, base expansion and flattened, inserted at middle of perianth, filaments 5.5-6.5 mm long, anthers oblong-lanceolate, 1.5-2.0 mm long, ca. 1 mm wide. Ovary superior, globose, 4.5-5.5 mm long, 3.5-4.5 mm in diam., glabrous, style filiform, ca. 1 cm long, glabrous, stigma entire, pubescent. Fruits berry, globose, glabrous. 2n=22.

Endemic.

Known only from the summit of Mt. Chingshuishan, ca. 2300-2400 m, on exposed limestone slopes (Fig. 4 ).

Specimen examined.

Hualien county: Hsiulin township, Mt. Chingshuishan, on the way from the entrance to the mountain peak, 2000-2400 m, 9 May 1997, C. H. Chen & S. D. Shen 2066 (TNM; TNU); Mt. Chingshuishan, near the summit, ca. 2200 m, 2 Jun 2010, C. T. Chao 1424 (TCF); same loc., 17 May 2014, C. T. Chao 3396 (TCF); same loc., 17 May 2015, C. T. Chao 3767 (TCF); same loc., 1 May 2016, C. T. Chao 4128 (TCF); Hsiulin township, 2400 m, 22 Aug 1996, C. H. Chen & C. T. Lu 64 (TNU).

Figures

Figure 4. Distribution map of Polygonatum arisanense var. chingshuishanianum.

Figure 7. Polygonatum arisanense var. chingshuishanianum. A habit B rhizome C leaf adaxial surface D leaf abaxial surface E inflorescence F expanded perianth with stamens G pistil.