Abstract
Spiradiclis yuanyangensis is described and illustrated from Yunnan Province in southwestern China. It is morphologically most similar to S. petrophila H. S. Lo, but differs from the latter mainly by its stem pubescent, corolla tube 4–5 mm (vs. ca. 2 mm) long, and short-styled corolla inside without a villous ring. A detailed description, line drawings and colour photographs are provided, together with notes on conservation status.
References
<p>Andersson, L. & Rova, J.H. (1999) Therps 16 intron and the phylogeny of the Rubioideae (Rubiaceae). <em>Plant Systematics and Evolution</em> 214: 161–186. https://doi.org/10.1007/BF00985737</p>
<p>Blume, C.L. (1825) <em>Bijdragen tot de flora van Nederlandsch Indië</em>. Lands Drukkerij, Batavia, 975 pp. https://doi.org/10.5962/bhl.title.115427</p>
<p>Bremekamp, C.E.B. (1952) The African species of <em>Oldenlandia</em> L. sensu Hiern et K. Schumann. <em>Verhandelingen Der Koninklijke Nederlandse Akademie Van Wtenshappen, Afd. Natuurkunde, Tweede Reeks</em> 48: 1–297.</p>
<p>Bremer, B. & Manen, J.F. (2000) Phylogeny and classification of the subfamily Rubioideae (Rubiaceae). <em>Plant Systematics and Evolution</em> 225: 43–72. https://doi.org/10.1007/BF00985458</p>
<p>Chen, T. & Taylor, C.M. (2011) <em>Spiradiclis</em>. <em>In</em>: Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) <em>Flora of China</em>, vol. 19. Science Press, Beijing & Missouri Botanical Garden Press, St. Louis, pp. 330–339.</p>
<p>IUCN Standards and Petitions Subcommittee (2019) <em>Guidelines for Using the IUCN Red List Categories and Criteria</em>. Version 14. IUCN Standards and Petitions Subcommittee.</p>
<p>Li, J.L., Yuan, Q., Liu, Y., Song, X.F., Pan, B., Qu, C.H. & Wu, L. (2021) Two new species of <em>Spiradiclis</em> (Rubiaceae) from limestone areas in southwestern China. <em>Nordic Journal of Botany</em> 39: e02979. https://doi.org/10.1111/njb.02979</p>
<p>Linnaeus, C. (1753) <em>Species Plantarum</em>, vol. 1. Laurentii Salvii, Stockholm, 560 pp.</p>
<p>Liu, J., Pan, B., Li, S.W. & Xu, W.B. (2018) <em>Spiradiclis quanzhouensis</em> (Rubiaceae): A new species from limestone area in Guangxi, China. <em>Nordic Journal of Botany</em> 36: 01595. https://doi.org/10.1111/njb.01595</p>
<p>Lo, H. S. (1999) <em>Spiradiclis</em> Bl. <em>In</em>: Lo, H.S. (Ed.) <em>Flora Reipublicae Popularis Sincae</em>, vol. 71 (1). Science Press, Beijing, pp. 86–110.</p>
<p>Lo, H.S. (1998) Materials for Chinese Rubiaceae (IV). <em>Bulletin of Botanical Research, Harbin</em> 18: 275–283.</p>
<p>Lo, H.S., Sha, W.L. & Chen, X.X. (1983) A revision of the genus of <em>Spiradiclis</em> Bl. (Rubiaceae). <em>Acta Botanica Austro Sinica</em> 1: 32–36.</p>
<p>Pan, B., Ma, H.S. & Wang, R.J. (2016) <em>Spiradiclis pengshuiensis </em>(Ophiorrhizeae, Rubioideae), a new species from Chongqing, China. <em>PhytoKeys </em>63: 41–45. https://doi.org/10.3897/phytokeys.63.8016</p>
<p>Pan, B., Tu, R.H., Hareesh, V.S. & Wu, L. (2019) <em>Spiradiclis cavicola </em>(Rubiaceae), a new species from Limestone Caves in Southwestern China. <em>Annales Botanici Fennici </em>56: 1–4. https://doi.org/10.5735/085.056.0101</p>
<p>Razafimandimbison, S.G. & Rydin, C. (2019) Molecular-based assessments of tribal and generic limits and relationships in Rubiaceae (Gentianales): Polyphyly of Pomazoteae and paraphyly of Ophiorrhizeae and <em>Ophiorrhiza</em>. <em>Taxon</em> 68: 72–91. https://doi.org/10.1002/tax.12023</p>
<p>Robbrecht, E. (1988) Tropical woody Rubiaceae. <em>Opera Botanica Belgica </em>1: 599–602.</p>
<p>Rydin, C., Kainulainen, K., Razafimandimbison, S.G., Smedmark, J.E. & Bremer, B. (2009) Deep divergences in the coffee family and the systematic position of Acranthera. <em>Plant Systematics and Evolution</em> 278: 101–123. https://doi.org/10.1007/s00606-008-0138-4</p>
<p>Thiers, B. (2019) <em>Index herbariorum</em>. New York Botanical Garden’s Virtual Herbarium Database. Available from: http://sweetgum.nybg.org/ih/ (accessed 10 June 2021)</p>
<p>Verdcourt, B. (1958) Remarks on the classification of the Rubiaceae. <em>Bulletin van den Rijksplantentuin, Brussel </em>28: 209–281. https://doi.org/10.2307/3667090</p>
<p>Wang, R.J. (2002) Two New Species of <em>Spiradiclis</em> (Rubiaceae) from China. <em>Novon</em> 12: 420–423. https://doi.org/10.2307/3393092</p>
<p>Wang, R.J. (2016a) <em>Spiradiclis jingxiensis </em>sp. nov. (Rubiaceae) from Guangxi, China. <em>Nordic Journal of Botany </em>34: 550–552. https://doi.org/10.1111/njb.01134</p>
<p>Wang, R.J. (2016b) <em>Spiradiclis yangchunensis </em>(Rubiaceae), a new species from Guangdong, China<em>.</em> <em>Plant Science Journal</em> 34: 13–17.</p>
<p>Wang, R.J., Wen, H.Z., Deng, S.J. & Zhou, L.X. (2015) <em>Spiradiclis danxiashanensis </em>(Rubiaceae), a new species from South China.<em> Phytotaxa</em> 206: 30–36. https://doi.org/10.11646/phytotaxa.206.1.5</p>
<p>Wen, H.Z., Wang, R.J. & Deng, S.J. (2015) <em>Spiradiclis longanensis</em>, a new species of Rubiaceae from China. <em>PhytoKeys </em>55: 113–117. https://doi.org/10.3897/phytokeys.55.4975</p>
<p>Wen, Z.J., Yang, J.C., Xu, Y.F. & Wu, L. (2019) <em>Spiradiclis densa</em> sp. nov. (Rubiaceae) from limestone areas in guangxi, china. <em>Nordic Journal of Botany </em>37: e02190. https://doi.org/10.1111/njb.02190</p>
<p>Wikström, N., Neupane, S., Karehed, J., Motley, T.J. & Bremer, B. (2013) Phylogeny of <em>Hedyotis</em> L. (Rubiaceae: Spermacoceae): Redefining a complex Asian-Pacific assemblage. <em>Taxon </em>62: 357–374. https://doi.org/10.12705/622.2</p>
<p>Wu, L., Li, X., Liu, W.J. & Liu, Q.R. (2019) <em>Spiradiclis karstana </em>(Rubiaceae), a new species from Yunnan, China. <em>PhytoKeys</em> 117: 1–8. https://doi.org/10.3897/phytokeys.117.28281</p>
<p>Wu, L., Tong, Y., Pan, B. & Liu,. Q.R. (2016) <em>Spiradiclis glabra </em>sp. nov. (Rubiaceae) from limestone area in Guangdong, China. <em>Nordic Journal of Botany</em> 34: 718–721. https://doi.org/10.1111/njb.01156</p>
<p>Wu, L., Wang, B.M., Pan, B. & Yu, X.L. (2019) <em>Spiradiclis tubiflora</em> (Rubiaceae), a new cave-dwelling species from southern China. <em>PhytoKeys</em> 130: 217–224. https://doi.org/10.3897/phytokeys.130.34625</p>
<p>Wu, L., Wang, J.L. & Liu, Q.R. (2015a) <em>Spiradiclis pauciflora </em>(Rubiaceae), a new species from limestone areas in Guangxi, China. <em>Annales Botanici Fennici</em> 52: 257–261. https://doi.org/10.5735/085.052.0318</p>
<p>Wu, L., Wang, J.L., Mo, S.S. & Liu, Q.R. (2015b) <em>Spiradiclis glandulosa </em>sp. nov. (Rubiaceae) from limestone areas in southern China. <em>Nordic Journal of Botany</em> 33: 79–82. https://doi.org/10.1111/njb.00577</p>
<p>Zhang, F., Liu, Y., Wen, Z.J. & Wu, L. (2018) <em>Spiradiclis lui,</em> a new species of Rubiaceae from Guangxi, China. <em>Nordic Journal of Botany</em> 2018: e01786. https://doi.org/10.1111/njb.01786</p>
<p>Blume, C.L. (1825) <em>Bijdragen tot de flora van Nederlandsch Indië</em>. Lands Drukkerij, Batavia, 975 pp. https://doi.org/10.5962/bhl.title.115427</p>
<p>Bremekamp, C.E.B. (1952) The African species of <em>Oldenlandia</em> L. sensu Hiern et K. Schumann. <em>Verhandelingen Der Koninklijke Nederlandse Akademie Van Wtenshappen, Afd. Natuurkunde, Tweede Reeks</em> 48: 1–297.</p>
<p>Bremer, B. & Manen, J.F. (2000) Phylogeny and classification of the subfamily Rubioideae (Rubiaceae). <em>Plant Systematics and Evolution</em> 225: 43–72. https://doi.org/10.1007/BF00985458</p>
<p>Chen, T. & Taylor, C.M. (2011) <em>Spiradiclis</em>. <em>In</em>: Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) <em>Flora of China</em>, vol. 19. Science Press, Beijing & Missouri Botanical Garden Press, St. Louis, pp. 330–339.</p>
<p>IUCN Standards and Petitions Subcommittee (2019) <em>Guidelines for Using the IUCN Red List Categories and Criteria</em>. Version 14. IUCN Standards and Petitions Subcommittee.</p>
<p>Li, J.L., Yuan, Q., Liu, Y., Song, X.F., Pan, B., Qu, C.H. & Wu, L. (2021) Two new species of <em>Spiradiclis</em> (Rubiaceae) from limestone areas in southwestern China. <em>Nordic Journal of Botany</em> 39: e02979. https://doi.org/10.1111/njb.02979</p>
<p>Linnaeus, C. (1753) <em>Species Plantarum</em>, vol. 1. Laurentii Salvii, Stockholm, 560 pp.</p>
<p>Liu, J., Pan, B., Li, S.W. & Xu, W.B. (2018) <em>Spiradiclis quanzhouensis</em> (Rubiaceae): A new species from limestone area in Guangxi, China. <em>Nordic Journal of Botany</em> 36: 01595. https://doi.org/10.1111/njb.01595</p>
<p>Lo, H. S. (1999) <em>Spiradiclis</em> Bl. <em>In</em>: Lo, H.S. (Ed.) <em>Flora Reipublicae Popularis Sincae</em>, vol. 71 (1). Science Press, Beijing, pp. 86–110.</p>
<p>Lo, H.S. (1998) Materials for Chinese Rubiaceae (IV). <em>Bulletin of Botanical Research, Harbin</em> 18: 275–283.</p>
<p>Lo, H.S., Sha, W.L. & Chen, X.X. (1983) A revision of the genus of <em>Spiradiclis</em> Bl. (Rubiaceae). <em>Acta Botanica Austro Sinica</em> 1: 32–36.</p>
<p>Pan, B., Ma, H.S. & Wang, R.J. (2016) <em>Spiradiclis pengshuiensis </em>(Ophiorrhizeae, Rubioideae), a new species from Chongqing, China. <em>PhytoKeys </em>63: 41–45. https://doi.org/10.3897/phytokeys.63.8016</p>
<p>Pan, B., Tu, R.H., Hareesh, V.S. & Wu, L. (2019) <em>Spiradiclis cavicola </em>(Rubiaceae), a new species from Limestone Caves in Southwestern China. <em>Annales Botanici Fennici </em>56: 1–4. https://doi.org/10.5735/085.056.0101</p>
<p>Razafimandimbison, S.G. & Rydin, C. (2019) Molecular-based assessments of tribal and generic limits and relationships in Rubiaceae (Gentianales): Polyphyly of Pomazoteae and paraphyly of Ophiorrhizeae and <em>Ophiorrhiza</em>. <em>Taxon</em> 68: 72–91. https://doi.org/10.1002/tax.12023</p>
<p>Robbrecht, E. (1988) Tropical woody Rubiaceae. <em>Opera Botanica Belgica </em>1: 599–602.</p>
<p>Rydin, C., Kainulainen, K., Razafimandimbison, S.G., Smedmark, J.E. & Bremer, B. (2009) Deep divergences in the coffee family and the systematic position of Acranthera. <em>Plant Systematics and Evolution</em> 278: 101–123. https://doi.org/10.1007/s00606-008-0138-4</p>
<p>Thiers, B. (2019) <em>Index herbariorum</em>. New York Botanical Garden’s Virtual Herbarium Database. Available from: http://sweetgum.nybg.org/ih/ (accessed 10 June 2021)</p>
<p>Verdcourt, B. (1958) Remarks on the classification of the Rubiaceae. <em>Bulletin van den Rijksplantentuin, Brussel </em>28: 209–281. https://doi.org/10.2307/3667090</p>
<p>Wang, R.J. (2002) Two New Species of <em>Spiradiclis</em> (Rubiaceae) from China. <em>Novon</em> 12: 420–423. https://doi.org/10.2307/3393092</p>
<p>Wang, R.J. (2016a) <em>Spiradiclis jingxiensis </em>sp. nov. (Rubiaceae) from Guangxi, China. <em>Nordic Journal of Botany </em>34: 550–552. https://doi.org/10.1111/njb.01134</p>
<p>Wang, R.J. (2016b) <em>Spiradiclis yangchunensis </em>(Rubiaceae), a new species from Guangdong, China<em>.</em> <em>Plant Science Journal</em> 34: 13–17.</p>
<p>Wang, R.J., Wen, H.Z., Deng, S.J. & Zhou, L.X. (2015) <em>Spiradiclis danxiashanensis </em>(Rubiaceae), a new species from South China.<em> Phytotaxa</em> 206: 30–36. https://doi.org/10.11646/phytotaxa.206.1.5</p>
<p>Wen, H.Z., Wang, R.J. & Deng, S.J. (2015) <em>Spiradiclis longanensis</em>, a new species of Rubiaceae from China. <em>PhytoKeys </em>55: 113–117. https://doi.org/10.3897/phytokeys.55.4975</p>
<p>Wen, Z.J., Yang, J.C., Xu, Y.F. & Wu, L. (2019) <em>Spiradiclis densa</em> sp. nov. (Rubiaceae) from limestone areas in guangxi, china. <em>Nordic Journal of Botany </em>37: e02190. https://doi.org/10.1111/njb.02190</p>
<p>Wikström, N., Neupane, S., Karehed, J., Motley, T.J. & Bremer, B. (2013) Phylogeny of <em>Hedyotis</em> L. (Rubiaceae: Spermacoceae): Redefining a complex Asian-Pacific assemblage. <em>Taxon </em>62: 357–374. https://doi.org/10.12705/622.2</p>
<p>Wu, L., Li, X., Liu, W.J. & Liu, Q.R. (2019) <em>Spiradiclis karstana </em>(Rubiaceae), a new species from Yunnan, China. <em>PhytoKeys</em> 117: 1–8. https://doi.org/10.3897/phytokeys.117.28281</p>
<p>Wu, L., Tong, Y., Pan, B. & Liu,. Q.R. (2016) <em>Spiradiclis glabra </em>sp. nov. (Rubiaceae) from limestone area in Guangdong, China. <em>Nordic Journal of Botany</em> 34: 718–721. https://doi.org/10.1111/njb.01156</p>
<p>Wu, L., Wang, B.M., Pan, B. & Yu, X.L. (2019) <em>Spiradiclis tubiflora</em> (Rubiaceae), a new cave-dwelling species from southern China. <em>PhytoKeys</em> 130: 217–224. https://doi.org/10.3897/phytokeys.130.34625</p>
<p>Wu, L., Wang, J.L. & Liu, Q.R. (2015a) <em>Spiradiclis pauciflora </em>(Rubiaceae), a new species from limestone areas in Guangxi, China. <em>Annales Botanici Fennici</em> 52: 257–261. https://doi.org/10.5735/085.052.0318</p>
<p>Wu, L., Wang, J.L., Mo, S.S. & Liu, Q.R. (2015b) <em>Spiradiclis glandulosa </em>sp. nov. (Rubiaceae) from limestone areas in southern China. <em>Nordic Journal of Botany</em> 33: 79–82. https://doi.org/10.1111/njb.00577</p>
<p>Zhang, F., Liu, Y., Wen, Z.J. & Wu, L. (2018) <em>Spiradiclis lui,</em> a new species of Rubiaceae from Guangxi, China. <em>Nordic Journal of Botany</em> 2018: e01786. https://doi.org/10.1111/njb.01786</p>