206 



SYSTEMATIC BOTANY. 



in conservatories. 



XS20. 



Other very showy plants belong to the 

 genera Kalmia, Rho- 

 dodendron, and Aza- 

 lea. The Black 

 H uckleberries are 

 I the fruit of Gaylus- 

 sada resinosa; Early 

 Blueberry, of Vac- 

 dnium Pennsylvani- 

 cum; Late Blueberry, 

 of F. vacillans; 

 Swamp-Blueberry, of 

 V. corymbomm; Small 

 Cranberry, of V. Oxy- 

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

 tensively cultivated. The Pipsissewa, or Prince's Pine 

 {ChimapUla mamlata), used by the Indians as a medicine, 

 the parasitic or saprophytic Indian-pipe {Monotropa uni- 

 flora'), and Pine-sap (il£ Hypopitys), the 

 Trailing Arbutus {JEpigma repens), are 

 among our other common representa- 

 tives of this family. 



i6. Composite. The Sunflower 

 family comprises ten thousand species 

 of herbs and shrubs (rarely trees), 

 easily recognized (Pig. 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 leevis) ; re, receptacle ; in, involucre ; 

 A^, ray-flowers ; d.Jl, disli-flowers : an, anthers ;/, pollen ; ach, achenium ; ch, cbnfF. 

 st, stigma ; the florets magnified 4, the stigma 18, and the pollen grain 221) diam- 

 eters. Fig. 321. Reflexed involucre {in) of the Dandelion, showing the receptacle 

 {rec), and a few acheula {ach) with pappus {P). 



