L'ornementation tégumentaire des graines de 162 espèces de Papilionaceae a été étudiée en microscopie électronique à balayage. D'un intérêt taxonomique certain, elle a permis d'émettre des hypothèses phylogéniques entre les taxa.Summary.-The ornementation of seed coats was studied in 162 species of Papilionaceae by Scanning Electron Microscopy. This study reveals the taxonomie interest of this ornementation and suggests phylogenetic hypothesis.

Summary.-The use of scanning electron microscopy has led to described more precisely the leal trichomes of some perimediterranean Quercus species. This technics more pertormant than the classical optic microscopy show six trichome types. 1 -simple uniseriate. 2 -capitale. 3 -unicellular. 4 -stellate. 5 -fused stellate. 6 -fasciculate. Some of them are restricted to particular species. Basides mature and immature leaves show quantitative and qualitative diHerences. Th en three groups could be distinguished :the deciduous species, the se mi evergreen and the evergreen oaks species.

The stomatal types of 102 species illustrating the different subdivisions of Bentham's classification of the genus Acacia were studied at two or three ontogenetic stages: first pinnate leaf to bipinnate leaves or to phyllode. Six stomatal types are recognized on the basis of Guyot's nomenclature (1966): 1, 2, 3, 4, 4′, 6; a new type (3′) is described. The specialization of the leaf up to the phyllode stage is followed by a decrease of diversity of the stomatal formula and an increasing frequency of the ‘basic core’ 3, 3′, 4. The distinction between the two Australian groups of bipinnate species (series Pulchellae and Botrycephalae) is confirmed. Possible relationships between the cosmopolitan series Vulgares (the most primitive group) and some Australian taxa as well as between the Pulchellae and some phyllodic species from the Australian series Phyllodineae are commented on. The series Gummiferae looks quite distinct from other groups.

Laboratoire cie /Jolanique, L'niver.~ilé l'aul-Sabatic·r, 39, alléPs .Tu/es-Guesde, 31077 Summary. -A study of colyledonary and foliar epidermis on 42 genera of Papilionac<•at•, shows six types of stomatas. Our observations !carl lo the com·lusion that the typt• of slomata is dcfinitely established on the set•dling. al the cotylcdonary stage. Mon·-ovPr, there is a c.onspic.uous homogeneity al the gcrH·rk lcvcl. Thus, our slurly allows an allt'mpl of classification.