Zamia nesophila

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Zamia nesophila
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnospermae
Division: Cycadophyta
Class: Cycadopsida
Order: Cycadales
Family: Zamiaceae
Genus: Zamia
Species:
Z. nesophila
Binomial name
Zamia nesophila
A.S.Taylor, J.L.Haynes & Holzman

Zamia nesophila, common name "guade teet", [1] is a species of cycad in the family Zamiaceae. It is endemic to several islands in northwestern Panama. Most plants grow on sandy beachs close to the sea, although some grow inland in forests. The species is critically endangered due to seaside development.

Contents

Classification

Taylor B. et al. (2008) described Z. nesophila based on specimens from the type locality in Bocas del Toro Province, Panama. The population had previously been regarded as part of the highly variable species Z. skinneri. It remains part of the Zamia skinneri species complex. [2] Taylor B. et al. (2012) proposed that Z. nesiphila evolved from Z. skinneri or its predecessor as a result of being isolated on islands. [3]

Description

Z. nesophila is a shrub or small tree, with a stem growing up to 2.8 metres (9 ft 2 in) tall and 6 to 24 centimetres (2.4 to 9.4 in) in diameter. The stem may branch at the base or the top, sometimes both. There are up to 20 leaves per crown, the average number is about 11. The leaves are 116 to 239 centimetres (46 to 94 in) long, with 5 to 12 pairs of leaflets. Leaflets are elliptic, acuminate, and plicate (pleated) between veins, and with serrated edges. Leaflets along the middle of the stem are 25 to 38 centimetres (9.8 to 15.0 in) long and 6.5 to 10.5 centimetres (2.6 to 4.1 in) wide. The leaves are bright green when they emerge. They mature to a glossy medium green. [2]

Reproduction

Like all Zamias, Z. nesophila is dioecious, with individual plants bearing either male or female stroboli or cones, but not both. [4] Microstrobili, male cones, are 8 to 16 centimetres (3.1 to 6.3 in) long and 2 to 2.5 centimetres (0.79 to 0.98 in) wide, conical-cylindrical or elongated conical-cylindrical. The microstrobili occur singly or in groups of 2 to 5, and are reddish-golden to brownish-yellow. The megastrobili, female cones, are 15 to 39 centimetres (5.9 to 15.4 in) long and 4.5 to 10.4 centimetres (1.8 to 4.1 in) wide. They are cylindrical-globose, usually with a single megastrobolus per plant. The megastrobili emerge covered with yellow-brown to tan hairs which mature to green or greyish-green with tan to brown hairs. Seeds are 1.9 to 2.8 centimetres (0.75 to 1.10 in) long and 1.1 to 1.8 centimetres (0.43 to 0.71 in) wide. There are 400 or more seeds in a mature cone. The sarcotesta (seed coat) is bright red on a mature seed. Pollination has observed to occur three times in a year. [2] While a pollination agent has not been definitely identified, beetles of the genus Pharaxonotha have been observed in male cones, and species of that genus are known pollinators of some other species of Zamia. [5]

Habitat

Z. nesophila is endemic to a few islands in the Bocas del Toro Archipelago. The primary habitat of Z. nesophila is sandy soil among vegetation on beaches. The largest populations are just above the high tide line on beaches where they are subject to salt water spray and flooding. A secondary habitat is acidic soil with humus on low hills in tropical forests on some of the islands. A population of about 15,000 plants along a beach has been largely destroyed by development since 2007. Another population of at least 10,000 plants was largely destroyed by the development of a beach resort. Smaller populations have also been destroyed by seaside development. [5]

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References

  1. 1 2 Taylor-Blake, A. & Haynes, J. & Holzman, G. (2023) [errata version of 2022 assessment]. "Zamia nesophila". IUCN Red List of Threatened Species . 2024 (2): e.T187842A243408381. Retrieved 7 November 2024.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  2. 1 2 3 Taylor B., Haynes & Holzman 2008, p. 420.
  3. ↑ Taylor B. et al. 2012, p. 90, 93.
  4. ↑ Stevenson, Dennis Wm. (April 2004). "Cycads of Colombia". The Botanical Review. 70 (2): 203. doi:10.1663/0006-8101(2004)070[0194:COC]2.0.CO;2. ISSN   1874-9372.
  5. 1 2 Taylor B., Haynes & Holzman 2008, p. 421.

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