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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:
- Agrostis hyemalis
- Andropogon bicornis
- Andropogon glomeratus
- Andropogon gracilis
- Andropogon leucostachyus
- Andropogon virginicus
- Aristida adscensionis
- Aristida chaseae
- Aristida portoricensis
- Aristida refracta
- Aristida spiciformis
- Aristida suringarii
- Aristida swartziana
- Arthraxon castratus
- Arundinella hispida
- Axonopus aureus
- Axonopus compressus
- Axonopus fissifolius
- Bouteloua americana
- Bouteloua juncea
- Bouteloua repens
- Cenchrus brownii
- Cenchrus echinatus
- Cenchrus gracillimus
- Cenchrus myosuroides
- Cenchrus spinifex
- Chloris barbata
- Chloris ciliata
- Chloris cubensis
- Chloris elata
- Chloris radiata
- Chloris sagraeana
- Chusquea abietifolia
- Dichanthelium aciculare
- Dichanthelium acuminatum
- Dichanthelium dichotomum
- Dichanthelium leucothrix
- Dichanthelium ovale
- Dichanthelium sabulorum
- Dichanthelium scoparium
- Dichanthelium strigosum
- Diectomis fastigiata
- 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 amabilis
- Eragrostis barrelieri
- Eragrostis ciliaris
- Eragrostis curvula
- Eragrostis elliottii
- Eragrostis glutinosa
- Eragrostis hypnoides
- Eragrostis pectinacea
- Eragrostis pilosa
- Eragrostis urbaniana
- Eriochloa polystachya
- 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 ligulata
- Lasiacis sloanei
- Lasiacis sorghoidea
- Leersia hexandra
- Leersia monandra
- Leptochloa fusca
- Leptochloa nealleyi
- Leptochloa panicea
- Leptochloa panicoides
- Leptochloa scabra
- Leptochloa virgata
- Leptochloopsis virgata
- Leptocoryphium lanatum
- Lithachne pauciflora
- Panicum dichotomiflorum
- Panicum diffusum
- Panicum elephantipes
- Panicum ghiesbreghtii
- Panicum laxum
- Panicum miliaceum
- 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 conjugatum
- Paspalum convexum
- Paspalum decumbens
- Paspalum densum
- Paspalum dilatatum
- Paspalum dispar
- Paspalum distichum
- Paspalum fasciculatum
- Paspalum fimbriatum
- Paspalum laxum
- Paspalum macrophyllum
- Paspalum maritimum
- Paspalum millegrana
- Paspalum minus
- Paspalum molle
- Paspalum notatum
- Paspalum orbiculatum
- Paspalum paniculatum
- Paspalum parviflorum
- Paspalum paucispicatum
- Paspalum pleostachyum
- Paspalum plicatulum
- Paspalum pulchellum
- Paspalum rupestre
- Paspalum secans
- Paspalum setaceum
- Paspalum urvillei
- Paspalum vaginatum
- Paspalum virgatum
- Pharus lappulaceus
- Pharus latifolius
- Pharus parvifolius
- Sacciolepis indica
- Sacciolepis striata
- Schizachyrium brevifolium
- Schizachyrium sanguineum
- Schizachyrium tenerum
- Setaria barbata
- Setaria chapmanii, syn. Paspalidium chapmanii
- Setaria geminata, syn. Paspalidium geminatum
- Setaria magna
- Setaria parviflora
- Setaria pradana
- Setaria rariflora
- Setaria setosa
- Setaria tenacissima
- Setaria utowanaea
- Setaria vulpiseta
- Sorghastrum setosum
- Sorghastrum stipoides
- Sporobolus cubensis
- Sporobolus domingensis
- Sporobolus indicus
- Sporobolus pyramidatus
- Sporobolus tenuissimus
- Sporobolus virginicus
- Tragus berteronianus
- Tripsacum fasciculatum
- Tripsacum latifolium
- Urochloa adspersa
- Urochloa arrecta
- Urochloa brizantha
- Urochloa decumbens
- Urochloa distachya
- Urochloa fuscata
- Urochloa maxima
- Urochloa mosambicensis
- Urochloa mutica
- Urochloa plantaginea
- Urochloa reptans
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