APPENDIX II 171 



portion of the United States. Plantains are common. 

 The species with the longer spikes are preferable. 

 Specimens in formalin solution may be used when 

 fresh material is not available. 



7. Some Pelargoniums, also, are excellent, but others are not. 



For Geranium, compare Lubbock, Flowers, Fruits, 

 and Leaves, p. 8, Figs. 5 and 6. The various Mal- 

 lows are excellent, for the stigmas of most species 

 remain within the stamen tube until the anthers have 

 shed their pollen, then emerge and expand. The 

 larger flowered Willow-herbs (Epilobium species) are 

 excellent also, as may be seen from Gray, Text-book, 

 p. 222, and Kerner and Oliver, Volume II, Part i, 

 p. 309, Fig. 293. Preserved material will answer very 

 well, but the teacher will find that a very large num- 

 ber of different species of flowers are protandrous and 

 a considerable number protogynous. 



8. Heterostyly. Read Kerner and Oliver, Volume II, Part 



i, pp. 302, 303, 396-399, and 405 ; Gray, Text- 

 book, pp. 234-239 (under Hcterogonous Dimor- 

 phism and Trimorphisin) ; Lubbock, Flowers, Fruits, 

 and Leaves, pp. 30-33 ; Weed, Ten New England 

 Blossoms, pp. 1832 (Mayflower, Epigcea repens). 



The Bluets are well adapted for the demonstration of 

 heterostyly, but are available for the most only east of the 

 Mississippi River. Other species of Houstonia extend some- 

 what west of that. The blossoms of the Partridge Berry 

 (Mitchella repens) and of the Mayflower {Epigcea repens} 

 are also excellent, but the range of these plants is limited 

 and Eastern. 



The Primroses of the gardens and greenhouses do very 

 well, but very frequently one can find only one " length of 



