Page 16 – Growing region of stem
Fig. 13 . Growing region of stem. Radial section of the growing region, or the distal portion of the apical meristem of a 4-months-old plant. l, latest formed (i.e., youngest) leaf primordium l₁, l₂, l₃, successively older leaf primordia and young leaf; m, older meristem; pm, promeristem; ps, procambium strand entering second from last formed leaf primordium. X100.