238 STUDY OF COMMON PLANTS. 



Review your observations and record them precisely. 

 I. In writing an account of the flower treat it first from 

 the morphological standpoint, including a discussion of 



1. Original plan of the flower, as indicated by notches 



at the end of the corolla and number of stamens. 



2. Relation of calyx and ovary. 



3. Other evidences of modification. 



II. Enumerate the various physiological adaptations 

 such as 



1. Protective arrangements. 



2. Adaptations for securing fertilization. 1 



3. Means of dissemination of seeds. 



ROBIN'S-PLANTAIN. Erigeron bellidifolius, Mubl. 

 Distribution. 



Where have you noticed the plant growing most abun- 

 dantly ? Does it appear to be indigenous or introduced? 



General Characters. 



Describe the root, stem, and leaves. Note means of pro- 

 tection, if such exist. 2 It is said to produce " offsets." 

 Verify the statement. 







Inflorescence and Flowers. 



I. Compare the heads with those of the dandelion. 

 What are the most striking differences ? 



II. Make a longitudinal section and examine in their 

 natural position, and also separately, the purple ray flowers, 

 and the small, yellow disk flowers. The ray flowers are 



1 Cf. Lubbock, British Wild Flowers in Relation to Insects, p. Ill 

 et seq. ; Mtiller, Fertilization of Floivers, pp. 316-318, 350. 



2 Cf. Kerner, Flowers and their Unbidden Guests, Chap. IV. 



