110 



OBJECT LESSONS IN BOTAJNY. 



Prince's Pine, make a fine contrast of the two kinds of 

 stems. 



229. Several varieties of scale-stems mnst be distinguished ; 

 as, bulb, corm, rhizome, creeper, tuber, &c. 



230. The Tulip, Hyacinth, Onion, Lily,- havg hulls ; you 

 •see (Figs. 346, 34:7), they consist of roundish masses of thick 

 scales with a small axis — in fact, an overgrown bud. The 

 coTTn is like it in shape, but has a thick axis with thin scales 

 or none. (Fig. 345.) 



231. The rhizome, or root-stock, is a fleshy, underground 

 stem, often scaly and marked with scars, as you see in the 

 Bloodro(5t, Solomon's Seal (Figs. 348, 349). 



Fig. 850. Creeper of "Nimble Will," or Witoh-grasa : ft, bud; i, J, 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 oiit 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 bnds. 



339. Name five sorts of scale-stems. 



330. Describe the bulb ; the corm. 331. The rhizome. 



333. The creeper. 333. The tuber. 



