Dioon, Lindley, 1843
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publication ID |
https://doi.org/ 10.11646/phytotaxa.528.2.3 |
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DOI |
https://doi.org/10.5281/zenodo.5780059 |
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persistent identifier |
https://treatment.plazi.org/id/2A13879B-FFCB-FF8F-15A5-B990FA2A5185 |
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treatment provided by |
Plazi |
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scientific name |
Dioon |
| status |
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Key to the Dioon View in CoL View at ENA species in the Purpusii clade
Dioon salas-moralesae , Dioon merolae and Dioon oaxacensis belong to the Purpusii clade, as determined in previous phylogenetic studies ( Gutiérrez-Ortega et al., 2018b, 2018c; Dorsey et al. 2018). The other species in this clade are Dioon argenteum , Dioon califanoi De Luca & Sabato (1979: 170–172) , Dioon caputoi De Luca, Sabato & Vázquez Torres (1980: 44–46) , Dioon holmgrenii (1981b: 552–554), Dioon planifolium , and Dioon purpusii Rose (1909: 260– 261) . A key for the species of the Purpusii clade is here provided.
1a. Leaves green when emerging .............................................................................................................................................................2
1b. Leaves silver when emerging ......................................................................................................................................... D. argenteum View in CoL
2a. Leaflets strongly curved downward in the apical portion .................................................................................................. D. merolae View in CoL
2b. Leaflets not or slightly curved downward in the apical portion.........................................................................................................3
3a. Leaflets strongly imbricated...............................................................................................................................................................4 3b. Leaflets not imbricated.......................................................................................................................................................................6
4a. Leaflets inserted obliquely on the rachis, leaf strongly keeled ......................................................................................... D. califanoi View in CoL
4b. Leaflets not obliquely inserted on the rachis......................................................................................................................................5
5a. Leaflets flat, leaf frequently moderately keeled............................................................................................................ D. oaxacensis
5b. Leaflets slightly curved downward in the apical portion ...................................................................................... D. salas-moralesae View in CoL
6a. Leaves moderately keeled ................................................................................................................................................. D. purpusii View in CoL
6b. Leaves not keeled ...............................................................................................................................................................................7
7a. Leaflets 4–5 mm wide, widely spaced along the rachis ...................................................................................................... D. caputoi View in CoL
7b. Leaflets> 5 mm wide, slightly spaced along the rachis......................................................................................................................8
8a. Leaflets with 3–4 long spines on the upper margin and slightly decurved ................................................................... D. holmgrenii View in CoL
8b. Leaflets flat with 0–2 long spines on the upper margin ............................................................................................... D. planifolium View in CoL
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