Hello Adam,

Check out the following links:

http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=10246

http://www.botany.hawaii.edu/faculty/carr/cyper.htm

http://www.utas.edu.au/docs/plant_science/field_botany/species/monocots/fammono.html

http://www.utas.edu.au/docs/plant_science/field_botany/species/monocots/cypera.html

https://www.lsa.umich.edu/herb/publications/research/reznicek/1990_Reznicek.pdf

Good luck!

See also:

Seeds: Ecology, Biogeography, and, Evolution of Dormancy and Germination, 2nd Edition

by Carol C. Baskin and Jerry M. Baskin

Do you see www.tyr-db.org address? 

See the article in portuguese.

 Hi Adam,

If you happen to be interested in morphological traits, botanical classification, geo localization and characterization of plants and also pictures of most of them, I’d like to recommend a web site I “love” and that has proved useful to me in so many ways and opportunities:

www.plants.usda.gov

That's the web site of the United States Department of Agriculture, and it's great. 

Good luck in your endeavor.

Ana

Thank you all! I want to know physical traits, like seed lenght, width, height. I forget to put in the question these details, sorry. 

Hi Again, Adam,

I was doing a little bit more research for the topic of your interest and I thought of the Smithsonian National  Museum of Natural History, that is located in Washington DC. 

I've been there, was lucky enough to get to see some collections first hand (I had a cousin who was a researcher there).

I'd like to suggerst the following link hoping it may prove of help for you.

http://collections.nmnh.si.edu/search/botany/

Have a great day.

Ana

Thank you all for the answers!