110 OBJECT LESSONS IN BOTANY. 
Prince’s Pine, make a fine contrast of the two kinds of 
stems. 
229. Several varieties of scale-stems must be distinguished ; 
as, bulb, corm, rhizome, creeper, tuber, &c. 
230. The Tulip, Hyacinth, Onion, Lily, have bulbs ; you 
see (Figs. 346, 347), they consist of roundish masses of thick 
scales with a small axis—in fact, an overgrown bud. Th 
corm is like it in shape, but has a thick axis with thin scales 
ornone. (Fig. 345.) 
231. The rhizome, or root-stock, is a fleshy, underground 
stem, often scaly and marked with scars, as you see in the 
Bloodroot, Solomon’s Seal (Figs. 848, 349). 
Fig. 850. Creeper of ‘Nimble Will,” or Witch-grass: a, bud; 6, 6, bases of the 
stems which rise above-ground. 
232. The creeper is more slender, much branched, many- 
jointed and many-scaled, as seen in this figure of the Witch- 
grass. It sends out rootlets from its joints, and is very tena- 
cious of life, binding the soil into turf wherever it abounds. 
233. The tuber, such as grows on the underground stems 
of the Potato-plant, is evidently a stem (not a root), for it al- 
ways produces buds. 
229. Name five sorts of scale-stems. 
230. Describe the bulb; the corm. 281. The rhizome, 
232. The creeper. 233. The tuber. 
