T. G. B. Osborn. 
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about 1 to 2 cm. long. The hairy covering, when present, is often 
inconspicuous. “ Rolled ” leaves of the ericoid type are less common 
than might be expected. 
Underground Storage Organs. 
A number of the herbaceous plants flowering in September 
and October have bulbs or other storage organs. Their vegetative 
season is comparatively brief and they pass the heat of the summer 
in a dormant state ; as examples may be mentioned Drosera spp., 
most Orchidaceae and Liliaceae. The development of a surface root 
system in addition to a deeper one is a notable feature of many 
Liliaceae. Cliamcescilla corymbosa shows this double root system 
Text-Fig. 2. Liliaceous bulbous plants showing the development of a 
surface root system : a, Chamascilla corymbosa , surface roots arising from 
stock below the tuberous roots; b, Cccsia vittata\ c, Bulbine bulbosa. G.L., 
ground level. Half natural size. 
most clearly. There are numerous tuberous roots growing almost 
vertically downward. Arising below these on the axis are other 
fibrous roots that grow erect to branch in the superficial soil layers. 
