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The Cycad Pages
Dioon holmgrenii

Dioon holmgrenii "De Luca, Sabato & Vásq. Torres", Brittonia 33(4): 552-554 (1981).
"TYPE: Mexico, Oaxaca, 15 km S of San Gabriel, along road from Puerto Escondido to Oaxaca, 21 Mar 1980, M. Vazquez Torres 2304 (holo XALUV, iso ENCB, FI, MEXU, NAP, NY)."[NY][NY][NY][NY][NY]


Distribution and habitat: Mexico - Oaxaca

Conservation status: 1997 IUCN Red List of Threatened Plants category V.

Description:

Plants arborescent. Stem 6 m tall, 40 cm diam.

Leaves dark green, semiglossy, 130-150 cm long, flat (not keeled) in section (opposing leaflets inserted at 180° on rachis), with 230-260 leaflets; basal leaflets not reducing to spines, petiole spine-free for 13-15 cm.

Leaflets linear, not falcate, inserted at 60° to rachis, not overlapping; margins flat, dentate; median leaflets 10-12 cm long, 7-9 mm wide.

Pollen cones fusiform, pale brown, 30-40 cm long, 6-8 cm diam.

Seed cones ovoid, pale brown, 30-50 cm long, 20-30 cm diam.

Seeds subglobose, 25-30 mm long, 25-30 mm wide, sarcotesta cream or white.


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