Figure 5

Seed coat structure. Micrographs using light microscopy of the seed coat structure of six Caragana species from arid (C. korshinskii, a), semiarid (C. intermedia, b, and C. microphylla, c), semihumid (C. arborescens, d, and C. boisi, e) and humid (C. stipitata, f) habitats. Arrows show the gaps in the palisade tissue in (a) to (d); P, palisade layer.