Photosynthesis of individual leaves. -- The individual leaves of the tulip
cultivar 'Apeldoorn' showed a decrease in AMAX from the bottom leaf to
the middle leaf (Fig. 5). The AMAX of the bottom leaf is in close agreement
with the AMAX values for the cotyledons and ternate leaf of Phaseolus
vulgaris, and the first and second leaves of young Cucumis sativus (Van Laar
and Penning de Vries, 1972).