| In agreement with
Rzedowski (1983), the area that understands Sian Ka´they go finds in the
province Peninsula of Yucatán of the region caribe, in the kingdom neotropical.
As for the wealth florística, Durán and Olmsted (1990) registered
a total of 859 species, of the 1,970 reportadas for Yucatán. Medium forest
subperennifolia. It is more abundant of the reservation. The most important species
are: Brosimum alicastrum, Manilkara zapota and Talisia olivaeformis as emergentes
and Nectandra coriacea and Drypetes sp. in the lower canopy, as well as the palm
Chit (Thrinax radiata). Medium forest subcaducifolia. It has an extension approximately
of 12,000 has. In the forest subcaducifolia the palms are presented nakax (Coccothrinax
readii) and the palm kuka (Pseudophoenix sargentii); besides they dominate chaca
(Bursera simaruba) ,
 Caesalpinia
gaumeri y chechén (Metopium brownei).
In the previous types of
vegetation 230 species of trees have been found and bushes of which 14% they are
endémicas to the peninsula and only the 10% has affinity with the islands
of the Caribe. Forest lowers inundable. It is established upon marga and/or rock
calcárea in depressions, distributed in form of mosaic of parches small
inside the forest subperennifolia. For these communities 110 species are cited;
is distinguished for its great abundance of epífitas especially orquídeas
and bromelias. Important species: Erythroxylum sp., Randia aculeata, Byrsonyma
bucidaefolia, Malpighia lundellii, Cameraria latifolia, Eugenia buxifolia, and
Coccoloba floribunda. Besides Dalbergia glabra, Bucida spinosa, Haematoxylum campechianum,
and Bucida buceras, that are species that dominate each one by separated in distinct
communities. Humedales.
In Sian Ka´go they occupy large extensions.
In them distinct communities are found dominated by Typha dominguensis, Cladium
jamaicense, Phrogmites australis, Echinodorus andrieuxii and other species.
Manglar chaparro. Besides Rhizophora mangle, Avicennia germinans, Laguncularia
racemosa and Conocarpus erectus are found also Cladium jamaicensis and Elaocharis
cellulosa.  Manglar
of franja. This swamp forms a franja to every the long thing of the coast of Sian
Ka´they go and reaches heights of until 12 m. The mangles Rhizophora mangle,
Avicennia germinans and Laguncularia racemosa here reach greater size. In higher
areas is found Conocarpus erectus. Tasistal. It is a swamp of palms that reach
heights from 4 to 6 m; occasionally forms manchones small and more commonly a
franja to every the long thing of the coast. It is a community little diverse
where the palm tasiste (Acoellorraphe wrightii) is the dominant species of the
stratum arbóreo and Cladium jamaicensis of the herbaceous one.
Dunes.
The vegetation of these presents affinities with that of the islands
antillanas, for which they are different to the of the remainder of the country;
they register 15 groups of communities among the ones that emphasize, in zones
pioneras, Sesuvium, Ambrosia-Hymenocallis, and in the community of matorral Coccoloba
- Thrinax. Petenes. They are not presented like a strict type of vegetation, but
as very peculiar formations; the of greater extension they present a cenote in
the center. Two types exist: one upon rock calcárea that almost is not
flooded, and another upon marga or mob inundable; the first present vegetation
of forest, and the other of manglar or an association of forest-manglar.
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