1917] MARKLE—ROOT SYSTEMS 189 
the absorption probably being done by the ultimate branches of 
the tap root. Vegetative reproduction from the roots is common 
(fig. 17). 
12 i 
Fics. 12, 13.—Fig. 12, ertical ext 7 £ + cf. ee a re . 
fig. 13, vertical extension on of root system of Packylophus hirsutus 
mew em ee ee eee ee ee eee Se alietnettadt tt ie at ae aed aS ee wer ee ee 
