206 



SYSTEMATIC BOTANY. 



in conservatories. Other very showy plants belong to the 



genera ICalmia, RJio- 

 dodendron, and Asor 

 lea. The Black 

 Huckleberries are 

 ' the fruit of Gaylus- 

 saeia resinosa; Early 

 Blueberry, of Vao- 

 einium Pennsylvanir 

 ewm; Late Blueberry, 

 of V. vacillans; 

 Swamp-Blueberry, of 

 V. corymbosum; Small 

 Cranberry, of V. Oxy- 

 coccus; Large Cranberry, of V. macrocarpon, which is ex- 

 tensively cultivated. The Pipsissewa, or Prince's Pine 

 {Chimaphila mamlata), used by the Indians as a mediciue, 

 the parasitic or saprophytic Indian-pipe {Monotropa uni- 

 flora), and Pine-sap (Jf. Hypopitys), the 

 Trailing Arbutus (Epigcea repens), are 

 among our other common representa- 

 tives of this family. 



i6. Compositae. The Sunflower 

 family comprises ten thousand* species 

 of herbs and shrubs (rarely trees), 

 easily recognized (Fig. 320, 321) by 

 involucrate heads of flowers and syn- 

 genesious stamens. They are widely 

 distributed, many possess great beauty, but few are other- 

 Fig. 320. A composite flower {Heliopsis lievis); re, receptacle; in, involucre; 

 iig_ ray-flowers ; d.Jl, disk-flower.s ; an, anthers ; p, pollen ; ach, achcnitim ; ch, chaff. 

 St, stigma ; the florets magniHed 4, the stigma 18, and the pollen grain 220 diam- 

 eters. Fig. 321. Reflexed involucre (z«) of the Dandelion, showing the receptacle 

 f^rec), and a few achenia {ach) with pappus {P). 



