Abstract
We describe a new section (Astragalus sect. Rupertii A.E. Estrada, Villarreal & A.Delgado) from Mexico, its particular morphological features are, stipules free; calyx suboblong–urceolate to subglobose–urceolate, with subulate to triangular subulate teeth of the same size than tube; ovules 4; and pod 6–8 mm long, concealed by the calyx. The new section includes two endemic species from the state of Coahuila, Astragalus rupertii & A. pomphocalyx.
References
<p>Bagheri, A., Maassoumi, A.A., Rahiminejad, M.R. & Blattner, F.R. (2016) Molecular phylogeny and morphological analysis support a new species and new synonymy in Iranian <em>Astragalus</em> (Leguminosae). <em>PLoS ONE</em> 11 (3): e0149726. https://doi:10.1371/journal.pone.0149726</p>
<p>Bagheri, A., Maassoumi, A.A., Rahiminejad, M.R., Brassac, J. & Blattner, F.R. (2017) Molecular phylogeny and divergence times of Astragalus section Hymenostegis: An analysis of a rapidly diversifying species group in Fabaceae. <em>Scientific Report</em> 7: 14033. https://doi:10.1038/s41598-017-14614-3</p>
<p>Barneby, R.C. (1964) Atlas of North American <em>Astragalus</em>. <em>Memoirs of the New York Botanical Garden</em> 13: 1–1188.</p>
<p>Barneby, R.C. (1976) Dragma hippomanicum II. Astragali novi peninsulares Moraniani. <em>Brittonia</em> 28: 273–280. https://doi.org/10.2307/2805788</p>
<p>Estrada, E., Villarreal, J.A. & Yen, C.M. (2005) <em>Astragalus mario-sousae</em> (Fabaceae: Galegeae) a new species from northeastern Mexico. <em>Brittonia</em> 57 (4): 314–319. https://doi.org/10.1663/0007-196X(2005)057[0314:AMFGAN]2.0.CO;2</p>
<p>Estrada, C.E., González, E.S. & Villareal, Q.J.A. (2016) A new species of <em>Astragalus </em>(Fabaceae: Faboideae) from Durango, Mexico. <em>Phytotaxa </em>288 (1): 91–95. https://doi.org/10.11646/phytotaxa.288.1.10</p>
<p>Estrada, E., Rebman, J.P. & Villarreal, J.A. (2019) <em>Astragalus comonduensis</em> and <em>Calliandra pilocarpa</em> (Fabaceae), two new species from Baja California Sur, Mexico. <em>Phytotaxa</em> 391 (1): 57–68. https://doi.org/10.11646/phytotaxa.391.1.4</p>
<p>Estrada, C.E., Villarreal, Q.J. & Encina, D.J. (2020) A new species and a new section of <em>Astragalus</em> (Fabaceae: Papilionoideae) from Mexico. <em>Phytotaxa</em> 428 (3): 163–172. https://doi.org/10.11646/phytotaxa.428.3.1</p>
<p>Gray, A. (1853) Plantae Wrightianae Texano-Neo-Mexicanae Part II. <em>Smithsonian Contributions to Knowledge</em> 5 (6): 1–119.</p>
<p>Gray, A. (1864) Revision and arrangement (mainly by the fruit) of the North American species of <em>Astragalus</em> and <em>Oxytropis</em>. <em>Proceedings of the American Academy of Arts and Sciences</em> 6: 188–236.</p>
<p>Gray, A. (1868) Characters of new plants of California and elsewhere, principally of those collected by H. N. Berlandier in the State Geological Survey. <em>Proceedings of the American Academy of Arts and Sciences</em> 7: 327–401. https://doi.org/10.2307/20179569</p>
<p>Gray, A. (1878) Contributions to the Botany of North America. <em>Proceedings of the American Academy of Arts and Sciences</em> 13: 361–374. https://doi.org/10.2307/25138500</p>
<p>James, L.E. (1951) Observations on the taxonomy of <em>Astragalus</em>, subgenus <em>Hesprastraglaus. Contributions from the Duddley Herbarium </em>4: 57–72. P. XI.</p>
<p>Jones, M.E. (1923) <em>Revision of North American species of Astragalus. </em>Published by the author, Salt Lake City, Utah. 288 + 119 unnumbered.</p>
<p>Linnaeus, C. (1753) <em>Species plantarum</em>. Vol. 2. Impensis Laurentii Salvii, Holmiae, 639 pp.</p>
<p>Nuttall, T. (1848) <em>Astragalus </em>sect. <em>Microlobium</em>. <em>Journal of the Academy of Natural Sciences of Philadelphia </em>II, 1: 152.</p>
<p>Rzedowski, J. & Calderón de Rzedowski, G. (2015) Seis novedades de Leguminosae-Papilionoideae de México. <em>Acta Botanica Mexicana</em> 110: 1–19. https://doi.org/10.21829/abm110.2015.192</p>
<p>Sanderson, M.J. (1991) Phylogenetic relationships within North American <em>Astragalus</em> L. (Fabaceae). <em>Systematic Botany</em> 16 (3): 414–430. https://doi.org/10.2307/2419334</p>
<p>Sanderson, M.J. & Doyle, J.J. (1993) Phylogenetic Relationships in North American <em>Astragalus</em> (Fabaceae) based on chloroplast DNA restriction site variation. <em>Systematic Botany</em> 18 (3): 395–408. https://doi.org/10.2307/2419416</p>
<p>Schauer, S. (1847) Leguminosae <em>Astragalus hypoleucus</em> S. Schauer. <em>Linnaea</em> 20: 747.</p>
<p>Spellenberg, R., Van Devender, T.R. & Jenkins, P.D. (2014) <em>Astragalus martinii</em> (Fabaceae), a new species from Eastern Sonora and western Chihuahua, Mexico. <em>Phytoneuron</em> 66: 1–8.</p>
<p>Spellenberg, R.W. & Anderson, W.A. (2019) <em>Astragalus pilosior</em> (Fabaceae), a new species from the Sierra Madre Occidental in Chihuahua, Mexico. <em>Journal of the Botanical Research Institute of Texas</em> 13 (1): 131–140.</p>
<p>Villarreal, J.A. & Carranza, M.A. (1994) Two new species of <em>Astragalus</em> (Leguminosae) from northeastern Mexico. <em>Brittonia</em> 46 (4): 335–339. https://doi.org/10.1007/BF02819411</p>
<p>Thiers, B. (2021) [continuously updated] Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium. Available from: http://sweetgum.nybg.org/science/ih/ (accessed 21 June 2021)</p>
<p>Watson, S. (1882) Contributions to American Botany. 1 List of Plants from Southwestern Texas and Northern Mexico, collected chiefly by Dr. E. Palmer in 1879–1880 - I. Polypetalae. <em>Proceedings of the American Academy of Arts and Sciences</em> 17: 316–361. https://doi.org/10.2307/25138655</p>
<p>Zarre, S. & Azani, N. (2012) Perspectives in taxonomy and phylogeny of the genus <em>Astragalus</em> (Fabaceae): a review. <em>Progress in Biological Sciences.</em> [6 pp.]</p>
<p>Bagheri, A., Maassoumi, A.A., Rahiminejad, M.R., Brassac, J. & Blattner, F.R. (2017) Molecular phylogeny and divergence times of Astragalus section Hymenostegis: An analysis of a rapidly diversifying species group in Fabaceae. <em>Scientific Report</em> 7: 14033. https://doi:10.1038/s41598-017-14614-3</p>
<p>Barneby, R.C. (1964) Atlas of North American <em>Astragalus</em>. <em>Memoirs of the New York Botanical Garden</em> 13: 1–1188.</p>
<p>Barneby, R.C. (1976) Dragma hippomanicum II. Astragali novi peninsulares Moraniani. <em>Brittonia</em> 28: 273–280. https://doi.org/10.2307/2805788</p>
<p>Estrada, E., Villarreal, J.A. & Yen, C.M. (2005) <em>Astragalus mario-sousae</em> (Fabaceae: Galegeae) a new species from northeastern Mexico. <em>Brittonia</em> 57 (4): 314–319. https://doi.org/10.1663/0007-196X(2005)057[0314:AMFGAN]2.0.CO;2</p>
<p>Estrada, C.E., González, E.S. & Villareal, Q.J.A. (2016) A new species of <em>Astragalus </em>(Fabaceae: Faboideae) from Durango, Mexico. <em>Phytotaxa </em>288 (1): 91–95. https://doi.org/10.11646/phytotaxa.288.1.10</p>
<p>Estrada, E., Rebman, J.P. & Villarreal, J.A. (2019) <em>Astragalus comonduensis</em> and <em>Calliandra pilocarpa</em> (Fabaceae), two new species from Baja California Sur, Mexico. <em>Phytotaxa</em> 391 (1): 57–68. https://doi.org/10.11646/phytotaxa.391.1.4</p>
<p>Estrada, C.E., Villarreal, Q.J. & Encina, D.J. (2020) A new species and a new section of <em>Astragalus</em> (Fabaceae: Papilionoideae) from Mexico. <em>Phytotaxa</em> 428 (3): 163–172. https://doi.org/10.11646/phytotaxa.428.3.1</p>
<p>Gray, A. (1853) Plantae Wrightianae Texano-Neo-Mexicanae Part II. <em>Smithsonian Contributions to Knowledge</em> 5 (6): 1–119.</p>
<p>Gray, A. (1864) Revision and arrangement (mainly by the fruit) of the North American species of <em>Astragalus</em> and <em>Oxytropis</em>. <em>Proceedings of the American Academy of Arts and Sciences</em> 6: 188–236.</p>
<p>Gray, A. (1868) Characters of new plants of California and elsewhere, principally of those collected by H. N. Berlandier in the State Geological Survey. <em>Proceedings of the American Academy of Arts and Sciences</em> 7: 327–401. https://doi.org/10.2307/20179569</p>
<p>Gray, A. (1878) Contributions to the Botany of North America. <em>Proceedings of the American Academy of Arts and Sciences</em> 13: 361–374. https://doi.org/10.2307/25138500</p>
<p>James, L.E. (1951) Observations on the taxonomy of <em>Astragalus</em>, subgenus <em>Hesprastraglaus. Contributions from the Duddley Herbarium </em>4: 57–72. P. XI.</p>
<p>Jones, M.E. (1923) <em>Revision of North American species of Astragalus. </em>Published by the author, Salt Lake City, Utah. 288 + 119 unnumbered.</p>
<p>Linnaeus, C. (1753) <em>Species plantarum</em>. Vol. 2. Impensis Laurentii Salvii, Holmiae, 639 pp.</p>
<p>Nuttall, T. (1848) <em>Astragalus </em>sect. <em>Microlobium</em>. <em>Journal of the Academy of Natural Sciences of Philadelphia </em>II, 1: 152.</p>
<p>Rzedowski, J. & Calderón de Rzedowski, G. (2015) Seis novedades de Leguminosae-Papilionoideae de México. <em>Acta Botanica Mexicana</em> 110: 1–19. https://doi.org/10.21829/abm110.2015.192</p>
<p>Sanderson, M.J. (1991) Phylogenetic relationships within North American <em>Astragalus</em> L. (Fabaceae). <em>Systematic Botany</em> 16 (3): 414–430. https://doi.org/10.2307/2419334</p>
<p>Sanderson, M.J. & Doyle, J.J. (1993) Phylogenetic Relationships in North American <em>Astragalus</em> (Fabaceae) based on chloroplast DNA restriction site variation. <em>Systematic Botany</em> 18 (3): 395–408. https://doi.org/10.2307/2419416</p>
<p>Schauer, S. (1847) Leguminosae <em>Astragalus hypoleucus</em> S. Schauer. <em>Linnaea</em> 20: 747.</p>
<p>Spellenberg, R., Van Devender, T.R. & Jenkins, P.D. (2014) <em>Astragalus martinii</em> (Fabaceae), a new species from Eastern Sonora and western Chihuahua, Mexico. <em>Phytoneuron</em> 66: 1–8.</p>
<p>Spellenberg, R.W. & Anderson, W.A. (2019) <em>Astragalus pilosior</em> (Fabaceae), a new species from the Sierra Madre Occidental in Chihuahua, Mexico. <em>Journal of the Botanical Research Institute of Texas</em> 13 (1): 131–140.</p>
<p>Villarreal, J.A. & Carranza, M.A. (1994) Two new species of <em>Astragalus</em> (Leguminosae) from northeastern Mexico. <em>Brittonia</em> 46 (4): 335–339. https://doi.org/10.1007/BF02819411</p>
<p>Thiers, B. (2021) [continuously updated] Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium. Available from: http://sweetgum.nybg.org/science/ih/ (accessed 21 June 2021)</p>
<p>Watson, S. (1882) Contributions to American Botany. 1 List of Plants from Southwestern Texas and Northern Mexico, collected chiefly by Dr. E. Palmer in 1879–1880 - I. Polypetalae. <em>Proceedings of the American Academy of Arts and Sciences</em> 17: 316–361. https://doi.org/10.2307/25138655</p>
<p>Zarre, S. & Azani, N. (2012) Perspectives in taxonomy and phylogeny of the genus <em>Astragalus</em> (Fabaceae): a review. <em>Progress in Biological Sciences.</em> [6 pp.]</p>