Cycadaceae Pers.

First published in Syn. Pl. [Persoon] 2: 630. 1807 (1807)nom. cons.
This family is accepted

Descriptions

Timothy M. A. Utteridge and Laura V. S. Jennings (2022). Trees of New Guinea. Kew Publishing. Royal Botanic Gardens, Kew

Distribution
A single genus, Cycas, comprises this family. With c. 100 species it is the largest genus in the cycads (Cycadales) with the widest distribution, from the east coast of Africa and Madagascar, the Comoro Islands, India and Sri Lanka to Indo-China, China, Japan, Malesia, the Mariana Islands, SW Pacific Islands as far as Tonga, and Australia. There are six species in New Guinea, two of which are also found in the Solomon Islands.
Morphology General Habit
Gymnosperms with palm-like habit and large frond-like leaves.
[TONG]

Cycadaceae, John Lewis. Flora Zambesiaca 1:1. 1960

Morphology General Habit
Dioecious trees or shrubs
Morphology Stem
Trunk simple or sparsely branched, covered with spirally arranged leaf-bases and scale-leaves, either up to 15 m. tall or very short and almost subterranean
Morphology Leaves
Leaves usually long and pinnate, in close spirals, forming an often wide-spreading crown on the trunk and (except in one species of Macrozamia) intercalated with leathery scale-leaves
sex Male
Staminate strobilus forming a terminal cone of leathery scales with numerous pollen-sacs on their abaxial surface
Morphology Reproductive morphology Cones
Female strobilus either a loose apical whorl of fronds bearing erect ovules marginally (Cycas) or a terminal cone of thick and often woody scales bearing a pair of inverted ovules adaxially Staminate strobilus forming a terminal cone of leathery scales with numerous pollen-sacs on their abaxial surface
sex Female
Female strobilus either a loose apical whorl of fronds bearing erect ovules marginally (Cycas) or a terminal cone of thick and often woody scales bearing a pair of inverted ovules adaxially
[FZ]

Cycadaceae, Hutchinson and Dalziel. Flora of West Tropical Africa 1:1. 1954

Morphology General Habit
Shrubs or small trees with thick, usually simple stems and a crown of pinnatisect leaves circinate in bud; leaflets often with spiny teeth
Morphology Reproductive morphology Cones
Cones dioecious Males terminal or subterminal, composed of numerous leathery or fleshy flat or peltate scales bearing on the under-surface numerous pollen-sacs Female cones similar, the scales bearing a pair of inverted nude ovules on the lower side
sex Male
Males terminal or subterminal, composed of numerous leathery or fleshy flat or peltate scales bearing on the under-surface numerous pollen-sacs
sex Female
Female cones similar, the scales bearing a pair of inverted nude ovules on the lower side
Morphology Reproductive morphology Seeds
Seeds large, drupe-like, with copious endosperm; cotyledons 2
[FWTA]

Sources

  • Flora Zambesiaca

    • Flora Zambesiaca
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Flora of West Tropical Africa

    • Flora of West Tropical Africa
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Trees of New Guinea

    • Trees of New Guinea
    • http://creativecommons.org/licenses/by-nc-sa/3.0