Zamia roezlii

{{Short description|Species of cycad}}

{{Speciesbox

| image = Zamia Roezlii 550 DSC 0158 - young plant leave.jpg

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Lopez-Gallego, C. |author2=Calonje, M. |year=2022 |errata=2023 |title=Zamia roezlii |volume=2022 |page=e.T42178A243411399 |doi=10.2305/IUCN.UK.2022-1.RLTS.T42178A243411399.en |access-date=12 November 2024}}

| genus = Zamia

| species = roezlii

| authority = Linden

| synonyms =

}}

Zamia roezlii (chigua{{Cite web |title=Zamia roezlii (Chigua) description |url=https://www.conifers.org/za/Zamia_roezlii.php |access-date=2024-10-23 |website=www.conifers.org}}) is a species of cycad, a palm-like pachycaulous plant in the family Zamiaceae. It is found in Colombia (Choco, Nariño, Valle del Cauca, and Amazonas departments) and the Pacific coast of Ecuador. It is named for the Czech botanist Benedikt Roezl. A single sperm cell from Zamia roezlii is about 0.4{{nbsp}}mm in length and is visible to the unaided eye, being the world's largest plant sperm cell. Drosophila bifurca, a species of fruit fly, has sperm that are 5.8{{nbsp}}cm long, albeit mostly coiled tail.{{cite journal | last1 = Pitnick | first1 = S. | last2 = Spicer | first2 = G.S. | last3 = Markow | first3 = T.A. | year = 1995 | title = How long is a giant sperm? | journal = Nature | volume = 375 | issue = 6527| page = 109 | pmid = 7753164 | doi = 10.1038/375109a0 | bibcode = 1995Natur.375Q.109P | s2cid = 4368953 | doi-access = free }} The tree is up to 22 feet (seven meters) in height with fronds up to {{convert|10|ft|m|0|spell=on}} long bearing leaflets up to {{convert|20|in|cm|0|spell=on}} long and {{convert|6|in|cm|spell=on}} wide.{{cite journal | last= Stevenson | first= Dennis | date= April–June 2004 | title= Cycads of Colombia | journal= Bot. Rev. | volume= 70 | issue= 2 | page= 228 | doi= 10.1663/0006-8101(2004)070[0194:COC]2.0.CO;2 | s2cid= 27405158 }}