The grass family Poaceae is the largest group of flowering plants present on the island of Puerto Rico. With 258 species, it represents 9% of all Angiosperms and 33% of all Monocots.
The following is a list of grass species known to exist in Puerto Rico, separated by genus:
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Agrostis hyemalis
Andropogon bicornis
Andropogon gracilis
Aristida refracta
Aristida spiciformis
Aristida suringarii
Aristida swartziana
Arthraxon castratus
Arundinella hispida
Axonopus aureus
Bouteloua americana
Bouteloua juncea
Cenchrus brownii
Cenchrus gracillimus
Cenchrus myosuroides
Chloris ciliata
Chloris radiata
Chloris sagraeana
Chusquea abietifolia
Dichanthelium aciculare
Dichanthelium dichotomum
Dichanthelium leucothrix
Dichanthelium sabulorum
Dichanthelium strigosum
Diectomis argillacea
Diectomis bicornis
Diectomis ciliaris
Diectomis dolichophylla
Diectomis eriantha
Diectomis horizontalis
Diectomis insularis
Diectomis ischaemum
Diectomis longiflora
Diectomis nuda
Diectomis panicea
Diectomis sanguinalis
Diectomis setigera
Diectomis similis
Diectomis villosa
Diectomis violascens
Eragrostis barrelieri
Eragrostis elliottii
Eragrostis glutinosa
Eragrostis urbaniana
Eriochloa punctata
Eriochrysis cayennensis
Euclasta condylotricha
Eustachys petraea
Gymnopogon foliosus
Homolepis glutinosa
Hypogynium virgatum
Ichnanthus nemorosus
Ichnanthus pallens
Ichnanthus tenuis
Imperata brasiliensis
Imperata contracta
Isachne angustifolia
Lasiacis divaricata
Lasiacis grisebachii
Lasiacis sloanei
Lasiacis sorghoidea
Leersia monandra
Leptochloa nealleyi
Leptochloa panicea
Leptochloa panicoides
Leptochloa scabra
Leptochloa virgata
Leptochloopsis virgata
Leptocoryphium lanatum
Lithachne pauciflora
Panicum diffusum
Panicum elephantipes
Panicum ghiesbreghtii
Panicum laxum
Panicum parvifolium
Panicum rigidulum
Panicum schiffneri
Panicum stenodes
Panicum stevensianum
Panicum tenerum
Panicum trichanthum
Panicum trichoides
Panicum venezuelae
Pappophorum pappiferum
Paspalum arundinaceum
Paspalum bakeri
Paspalum blodgettii
Paspalum boscianum
Paspalum caespitosum
Paspalum clavuliferum
Paspalum convexum
Paspalum decumbens
Paspalum densum
Paspalum dispar
Paspalum fasciculatum
Paspalum fimbriatum
Paspalum laxum
Paspalum macrophyllum
Paspalum maritimum
Paspalum millegrana
Paspalum minus
Paspalum molle
Paspalum orbiculatum
Paspalum paniculatum
Paspalum parviflorum
Paspalum paucispicatum
Paspalum pleostachyum
Paspalum pulchellum
Paspalum rupestre
Paspalum secans
Paspalum virgatum
Pharus lappulaceus
Pharus latifolius
Pharus parvifolius
Sacciolepis indica
Sacciolepis striata
Schizachyrium brevifolium
Schizachyrium sanguineum
Setaria chapmanii, syn. Paspalidium chapmanii
Setaria geminata, syn. Paspalidium geminatum
Setaria magna
Setaria pradana
Setaria rariflora
Setaria setosa
Setaria tenacissima
Setaria utowanaea
Sorghastrum setosum
Sorghastrum stipoides
Sporobolus cubensis
Sporobolus domingensis
Sporobolus pyramidatus
Sporobolus tenuissimus
Tragus berteronianus
Tripsacum fasciculatum
Tripsacum latifolium
Urochloa adspersa
Urochloa arrecta
Urochloa decumbens
Urochloa distachya
Urochloa fuscata
Urochloa plantaginea
Urochloa reptans