I. — Graines de 1 mm., brunes

- anguleuses: Browalia, Salpiglossis.

- non aplaties: Petuma.

- légèrement aplaties: Nicotiana, Schzanthus, Nierembergia, Saracha,

Or

IT. — Graines de 2 ou 3 mim.:

- velues: Lycopersicum.

- glabres:

- brunes: Nicandra, Atropa, Cestrum, Sat chroa.

- grises: //yoscyamus.

- jaunes: Solanum, Physalis, Capsicum, LAcium, Physoclaina, Withamia, Cyphoman-

dra.