Schizostachyum chinense Rendle (1904: 448)
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publication ID |
https://doi.org/ 10.11646/phytotaxa.676.3.3 |
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persistent identifier |
https://treatment.plazi.org/id/C7267132-FFCC-FFF4-FF55-F24194014830 |
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treatment provided by |
Felipe |
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scientific name |
Schizostachyum chinense Rendle (1904: 448) |
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(4) Schizostachyum chinense Rendle (1904: 448) View in CoL . Figs. 2I–L View FIGURE 2 . ≡ Leptocanna chinensis (Rendle) L.C.Chia & H.L.Fung (1981: 213) . Type: — CHINA, Yunnan, Mengtze, S.E. mountains forests on cliffs, A. Henry 10420 (lectotype first step designated by Rendle (1904:
449); second step here designated: K [K000912115!]; isolectotypes: K [K000912114!, E00386849, E00386850, HUH00024398,
MO2114854, MO2114855, digital images!])
Description: — Culms erect, 5–10 m high, tips drooping; internodes bright green to yellowish green when young, green to dark green when mature, (30–) 45–80 cm long, 1–3.5(–5) cm in diameter, glabrous; walls (1–) 2–3 mm thick; nodes with slightly raised nodal line, covered with short white to pale hairs around the node. Culm leaves: sheaths initially purplish-green, later straw-colored, 15–30 cm long, apex asymmetrical, concave to nearly truncate, upper most part inflated, base of outer margin with a tiny projection, projection less than 5 mm wide, margins scarious, covered with pale hairs on abaxial side; auricles inconspicuous or narrow rim, oral setae 5–8 mm long; ligules ca. 1 mm high, irregularly toothed, ciliolate; blades erect, initially purplish-green, later straw-colored, narrowly lanceolate, 10–15 cm long, glabrous on both sides. Foliage leaves: auricles and oral setae absent; ligules ca. 1 mm high, irregularly toothed, ciliolate or nearly glabrous; blades 15–26 × 3–5 cm, glabrous on both sides. Pseudospikelets purple to purplish-green, lanceolate, 1.1–1.5 cm long; empty glumes (1–)2–3; rachilla internodes very short; fertile florets 1, 1–1.3 cm long, with terminal rachilla extension, 0.1–0.5 mm long, and with a tiny vestigial floret or absent; lemmas convolute, 1–1.1 cm long, glabrous; paleas convolute, 1–1.2 cm long, slightly keeled to sulcate, hairy near the apex. Lodicules (2)3. Stamens: anthers yellow, 4–6.5 mm long; filaments free.
Distribution and ecology: — Schizostachyum chinense has a restricted distribution at high elevations. It was previously found only in Yunnan, southeastern China, at 1,500 –2,000 m ( Xia & Stapleton 2006; Yang & Li 2007). Here, we report the southernmost distribution of this species on the Tenasserim mountain ranges of Thailand. They exist in montane forests at similar latitudes across populations, 1,300 m for populations in northern Thailand and 1,500 m for populations in southwestern Thailand.
Additional specimens examined: — THAILAND: Northern. Tak, Umphang, 25 December 2013, S. Sungkaew & A. Teerawatananon 1545 (BKF, Thailand Natural History Museum). South-western. Kanchanaburi, Sangkhlaburi, 25 December 2014, S. Sungkaew et al. 1551 ( Thailand Natural History Museum ) ; the same locality, 25 December 2013, S. Sungkaew et al. 1552 ( Thailand Natural History Museum ) ; Prang Phle, 28 January 2023, S. Sungkaew et al. 1772 ( Thailand Natural History Museum ) ; the same locality, 28 January 2023, S. Sungkaew et al. 1773 ( Thailand Natural History Museum ) ; the same locality, 28 January 2023, S. Sungkaew et al. 1774 ( Thailand Natural History Museum ) .
Conservation status: — Schizostachyum chinense has a relatively small EOO of less than 20,000 km 2 (9,659.4 km 2), which places it in the Vulnerable (VU) conservation category while a small AOO of less than 500 km 2 (84.0 km 2) leads to the Endangered (EN) category. There are less than five locations found so far and the populations continue declining due to their monocarpic habit and natural succession. This may lead to a very high risk of extinction in the wild. Based on IUCN (2023), we consider its conservation status Endangered [EN B2ac (iv)].
Vernacular name: —ไผ่ทวน (Phai Tuan).
Notes: —This is a new record of S. chinense for Thailand.
Nomenclatural notes: —The lectotypification of S. chinense was not complete and only had a first-step lectotypification in the previous studies ( Rendle 1904; Chia & Fung 1981; Yang & Li 2007). According to Art. 9.17 by Turland et al. (2018), a further step of lectotypification is required if there is more than one specimen in the same gathering labeled by different barcodes. Here, the S. chinense specimen deposited in the Kew herbarium and collected by A. Henry with barcode K000912115 was selected for this second-step lectotypification. The rest of specimens collected under A. Henry 10420 are treated as isolectotypes.
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