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| The Cycad Pages
| | Dioon sonorense
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- Dioon sonorense (De Luca, Sabato & Vázq. Torres) Chemnick & T.J. Greg. & S. Salas-Mor., Phytologia (July 1997) 83: 1-6 (1998).
Dioon tomasellii var. sonorense De Luca, Sabato & Vázq. Torres, Brittonia 36: 226-227 (1984). H—NAP
- Dioon edule var. sonorense (De Luca, Sabato & Vázq. Torres) R. McVaugh & Perez de la Rosa, in R. McVaugh, Fl. Novo-Galiciana 17: 112 (1992). BAS
- TYPE: Mexico, Sonora, Distrito de Alamos, Barranco Saucito, Sierra de Alamos, 15 Jun 1979, M. Vazquez Torres 2308 (holo NAP, iso ENCB, MEXU, NY, XALUV).
Distribution and habitat: Mexico
Conservation status: 1997 IUCN Red List of Threatened Plants category R.
Description:
Plants arborescent.
Leaves dark grey green, dull, flat (not keeled) in section (opposing
leaflets inserted at 180° on rachis).
Leaflets linear, not falcate, inserted at 90° to rachis, not
overlapping; margins flat, entire; median leaflets 10-18 cm long, 4-7 mm wide.
Pollen cones narrowly ovoid.
Seed cones ovoid.
Seeds ovoid, sarcotesta cream or white.
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