Try the Brazil Plants website. They have seeds to a lot of the species.

http://brazilplants.com/Seeds.html

Thank you,I know Brazil Plants very well. I bought several seeds,but I am still searching other ones.

Telos Rare Bulbs has many species available.

thank you,I know,but not which I am searching

Ton, if you are looking for specific species, why don't you list them here? We've given you the names of a couple good sources, but you say those aren't what you are searching for. Please tell us what you are searching for!

Ok, here they come:

yellow species and varieties:

H. puniceum Barbatum

H. viridiflorum

Yellow Marshmallow

Gold Shine

Kogane no Sato

Further the species:

H.angustifolium

H. lapacense

H. breviflorum

H. escobaruriae

H. leopoldii

H. leonardii

H. neoleopoldii

H. paquichanum

H.variegatum

Thank you all for helping me.