Aspidistra xuansonensis N.Vislobokov, 2014

Vislobokov, Nikolay A., Sokoloff, Dmitry D., Degtjareva, Galina V., Valiejo- Roman, Carmen M. & Kuznetsov, Andrey N., 2014, Aspidistra xuansonensis (Asparagaceae), a new species from northern Vietnam, Phytotaxa 173 (3), pp. 226-234 : 227

publication ID	https://doi.org/ 10.11646/phytotaxa.173.3.5
persistent identifier	https://treatment.plazi.org/id/03FE4063-FFA7-FF8E-3DB1-2CC34C817594
treatment provided by	Felipe
scientific name	Aspidistra xuansonensis N.Vislobokov
status	sp. nov.

Treatment

Aspidistra xuansonensis N.Vislobokov View in CoL , sp.nov. ( Fig. 1 View FIGURE 1 , 2 View FIGURE 2 )

Similar to A. lingyunensis Lin & Guo , but leaves longer (petioles 21–67 cm vs. 9–17 cm, lamina 20–46 cm vs. 15–22 cm), perianth wide tubular, anther position lower, stigma wider (4–8.6 mm vs. 3 mm).

Type:— VIETNAM, Phu Tho province, Thanh Son district, Xuan Son National Park, 21° 7.988' N, 104° 56.579' E, alt. 355 m, rainforest, 2 Nov 2013, N. A. Vislobokov 13092 (holotype, MW!), including flowers and fruits in liquid collection at Moscow University; the same locality, 5 Nov 2013, N. A. Vislobokov 13102 (paratype, MW! paratype), living plant from this collection in cultivation ( N. A. Vislobokov XS13AX01).

Herbaceous perennial rhizomatous evergreen plant ( Fig. 1f View FIGURE 1 ). Rhizome creeping, with very short internodes, epigeous, Ø 7.2 –11.2 [8.6] mm, with prop roots. Roots grey, Ø 1.9 –4.2 [2.8] mm, with multilayered velamen and dense hairs persistent up to root base, endoderm two-layered, pericycle of cells with lignified walls. Rhizomes with regularly repeating units, each comprising 7–12 distichously arranged cataphylls followed by a foliage leaf. Cataphylls greenish to reddish-brown, oblong, 3.1–18.5 [8.2] cm long, 14–18 [16] mm wide. Foliage leaves distinctly divided into petiole and lamina. Petiole dark to light green with pale green dots, adaxially sulcate, 18.5–67 [35.8] cm long, Ø 2–4.2 [2.9] mm. Lamina light green with pale green dots, oblong, basally somewhat unequally cuneate and distally acuminate, 19–46.5 [28.2] cm long, 5–9.8 [7.5] cm wide, with 3–5 secondary veins at both sides of the midvein ( Fig. 1g View FIGURE 1 ). The midvein and the secondary veins somewhat prominent at lower surface. Peduncle (specialized reproductive shoot) white to pale green or purple spotted, 1–3.8 [1.8] cm long, Ø 1,4 –2 [1.8] mm, with 3–7 widely ovate, acuminate, 5–12 [9.6] mm long, 4.5–10 [8.5] mm wide distichously arranged scale leaves. Flower solitary at the end of a peduncle. Perianth widely tubular to campanulate, 6.5–19.2 [13.4] mm long, Ø 11.8 –23.1 [17.4] mm; tube white outside, white or partly purple inside (perianth color does not change during anthesis), widened at the base, 5.3–10 [8.3] mm long, Ø 5.8 –9.9 [7.9] mm ( Fig. 1 View FIGURE 1 c-e); lobes 6 (rarely 4, 5, 7), greenish white or purple spotted to completely purple at both sides, widely ovate, obtuse, with extended margins overlying to adjoining in anthetic flowers, 4.6–8 [6.2] mm long, 4.2–9 [6.8] mm wide, lobes with 3-5 shallow longitudinal grooves ( Fig. 2 View FIGURE 2 a-f). Stamens 6 (rarely 4, 5, 7 – in the same number as perianth lobes), inserted at the lower part of the perianth tube, at the radii of tepals; anthers sessile, 2.5–3.4 [3] mm long, 1.3–2.0 [1.7] mm wide, introrse. Pistil suddenly obconic to nearly umbrella-shaped, 5–8 [6.7] mm long ( Fig. 1c, e View FIGURE 1 ). Style white to pale green or purple, cylindrical, 2.1–3 [2.5] mm long, Ø 1.5 mm. Stigma white at the upper side, white or purple at lower and lateral sides, relatively massive, obconic, papillose at the upper surface, somewhat concave, Ø 4–8.6 [6.2] mm, with 2-3-4 radial, bifurcate lines in central part, 4-6-8-lobed at the margin, lobes twice as many as ovary locules, sometimes lower because of low bifurcation rate ( Fig. 2d, e View FIGURE 2 ). Ovary inconspicuous, superior, 3-locular, rarely 2-locular in flowers with 6 tepals (2-locular in flowers with 4 or 5 tepals, 4-locular in a flower with 7 tepals) ( Fig. 2 View FIGURE 2 a-f). Fruits grayish black (young fruits green), subspherical, 6.2–9.5 [7.6] mm long, Ø 6.1 –10.2 [8.3] mm, with short conical protuberances ( Fig. 1h View FIGURE 1 ). A carpophore is absent. Fruiting peduncles 1.2–6.4 [3.9] cm long, Ø 1.1 –2.3 [1.8] mm, with mostly disintegrated and/or abscised scale leaves.