CHAPTER LIX. 



MONOCOTYLEDONS. 



Topic I : Monocotyledons with conspicuous petals 

 and regular flowers. 



ORDER LILIALES. 



1145. Lesson I. The lily family (Liliaceae). Trillium, which 

 we employed as a representative of the monocotyledons in the 

 morphology of the angiosperms, serves as one type of the lily 

 family. An exercise is added here on the "yellow adder's- 

 tongue" for those who wish to study more than one example of 

 the order. There is an .abundance of material from the mem- 

 bers of the family if the teacher desires to extend further the 

 exercises on the Liliaceae. 



Yellow adder 's-tongue (Erythronium americanum). 



SUGGESTIONS FOR STUDY OF THE YELLOW ADDER'S-TONGUE. 



1146. Entire plant. Observe the bulb from which the flowering scape 

 arises; the small scale-like leaves overlapping it; the two large spotted 

 leaves on plants which have the flower. In the case of the non-flowering 

 plants observe that there is only one large leaf. If an opportunity affords 

 for an excursion in the woods where the plant grows, see if you can deter- 

 mine how the bulbs are formed at the ends of the "runners." As to depth 

 in the soil compare the bulbs of the flowering and non-flowering plants. 



Inflorescence. The inflorescence is determinate, and consists of a single 

 terminal nodding flower on a scape. 



Flower. Beginning with the outer whorl of members of the flower deter- 

 mine the number of members in each whorl, as well as their form, relation 

 to each other, and the relation of the different sets among themselves. 



654 



