Abstract
Stachys siirtensis (Lamiaceae), a new endemic species from Botan Valley of Siirt province in Turkey, is here described. The species is characterized by having congested verticillasters. Hairiness, calyx and corolla length, as well as nutlet and the arrangement of verticillasters, have been used to distinguish Stachys species. Stachys siirtensis is morphologically similar to S. ballotiformis and S. kurdica. The new species resembles S. ballotiformis, but it can be distinguished by flowering stems with glabrous to sparsely and retrorsely pubescence, longer calyx (8–10 mm long) and corolla (13–15 mm long). It also differs from S. kurdica by stalked glandular flowering stems, congested verticillasters, having pilose and sessile glands on calyx, and oblong-obovoid nutlets.
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<p>Celep, F., Dirmenci, T. & Güner, Ö. (2015) <em>Salvia hasankeyfense</em> (Lamiaceae), a new species from Hasankeyf (Batman, South-eastern Turkey).<em> Phytotaxa </em>227 (3): 289–294. https://doi.org/10.11646/phytotaxa.227.3.9</p>
<p>Celep F., Karaer F. & Duman, H. (2021) Resurrection of <em>Lamium ponticum</em> (Lamiaceae) with a new subspecies, <em>Lamium ponticum</em> subsp. <em>anatolicum</em>, from Turkey. <em>Phytotaxa</em> 511 (1): 71–76. https://doi.org/10.11646/phytotaxa.511.1.6</p>
<p>Condé, S. (2008) <em>Biogeographical regions in Europe: The Anatolian region–</em>the biogeographical transition to Asia. European Environment Agency.</p>
<p>Davis, P.H. (1951). Three new species from Nearer East. <em>Notes from the Royal Botanic Garden</em>. 21: 46.</p>
<p>Davis, P.H., Mill, R.R. & Tan, K. (1988) <em>Flora of Turkey and East Aegean Islands</em>, vol. 10. Edinburgh University Press, Edinburgh pp. 204–206.</p>
<p>Duman, H. (2000) <em>Stachys</em> L. <em>In</em>: Güner, A., Özhatay, N., Ekim, T. & Başer, K.H.C. (Eds.) <em>Flora of Turkey and the East Aegean Islands</em>, vol. 11. Edinburgh University Press, Edinburgh. pp. 204–206.</p>
<p>Fidan, M. (2019) <em>Bellevalia sasonii</em> (Asparagaceae): a new species from Turkey. <em>Phytotaxa</em> 394 (2): 126–132. https://doi.org/10.11646/phytotaxa.394.2.1</p>
<p>Fırat, M. (2019) <em>Gundelia siirtica</em> (Asteraceae), a new lactiferous species from Siirt (South eastern Anatolia), <em>Phytotaxa</em> 394 (4): 276–284. https://doi.org/10.11646/phytotaxa.394.4.5</p>
<p>Fırat M. (2021) <em>Stachys semsurensis</em> (Lamiaceae), a new species from Adıyaman province (Turkey) belonging to section <em>Infrarosularis</em>. <em>Phytotaxa</em> 511 (3): 275–282. https://doi.org/10.11646/phytotaxa.511.3.6</p>
<p>García, M.B. (2003) Demographic viability of a relict population of the critically endangered plant <em>Borderea chouardii</em>. <em>Conservation Biology</em> 17: 1672–1680. https://doi.org/10.1111/j.1523-1739.2003.00030.x</p>
<p>Gören, A.C., Piozzi, F., Akçiçek, E., Kılıç, T., Çarıkcı, S., Mozioğlu, E. & Setzer, W.N. (2011) Essential oil composition of twenty-two <em>Stachys</em> species (mountain tea) and their biological activities. <em>Phytochemistry Letters</em> 4: 448–453. https://doi.org/10.1016/j.phytol.2011.04.013</p>
<p>Govaerts, R., Paton, A., Harvey, Y., Navarro, T. & Pena, M.R.G. (2021) (continuously updated). <em>World Checklist of Lamiaceae</em>. Facilitated by the Royal Botanic Gardens, Kew.</p>
<p>Güner, Ö. & Akçiçek, E. (2015) A new record for flora of Turkey: <em>Stachys megalodonta</em> Hausskn. & Bornm. ex P.H.Davis subsp. <em>megalodonta</em> (Lamiaceae). <em>Bağbahçe Bilim Dergisi</em> 2: 27–32. [in Turkish with an abstract in English]</p>
<p>Güner, Ö. & Ferrer-Galego, P.P. (2021) Nomenclatural and taxonomic notes on some <em>Stachys</em> taxa (Lamiaceae). <em>Turkish Journal of Botany</em> 45: 69–82. https://doi.org/10.3906/bot-2010-12</p>
<p>Güner, Ö., Selvi, S., Altınordu, F. & Martin, E. (2019) The analysis of some biological data on <em>Stachys kurdica</em> (Lamiaceae) in Turkey. <em>Phytologia Balcanica</em> 25 (3): 271–280.</p>
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