318 TETRANDRIA MONOGYNIA. 



HAB. Sandy pine woods. Aug. Sept. ^; stem 18 inches high 

 pan. pyramid., crowded flower white. 



75. HOUSTONIA. 



H. ccerulea : stem erect, setaceous, dichotomous ; radical leave* 

 spathulate-ovate ; peduncles elongated, 1-flowered ; segments of the 

 corolla acute. 



HAB. Moist rocks. Apr. May, 1].; stems numerous, 4 8 inches 

 high stem leaves narrow flower blue. 



76. MITCHELLA. Partridge-berry. 



M. repens. 



HAB. Woods. June July, 1\. ; evergreen, creeping, branched, 

 leaves opposite, roundish, petioled, smooth flowers term., white, fra- 

 grant. 



77. LINNJEA. 



L. borealis. 



HAB. Mountain woods. July, 1\. ; evergreen, creeping leaves op- 

 posite, ovate-round pedunc. erectflowers 2, drooping, white or 

 pale rose-color. 



78. SANGUISORBA. Great Burnet. 



S. canadensis : spikes cylindrical, very long ; stamens much longer 



than the corolla. 

 HAB. Bog-meadows. Aug. Oct. Ij.; stem 2 feet high, smooth 



leaves pinnate leaflets ovate, serrate flowers white. 



79. CORNUS. Dogwood, &c. 



* flowers capitate, surrounded by an involucrum. 



C. canadensis : herbaceous ; upper leaves verticillate, veined ; leaves 

 of the involucrum ovate, acuminate ; drupe globose. 



HAB. Mountain meadows and swamps. May June, 7J.; stem 6 

 inches high head term., pedunc. involucrum white. 



C. florida : arborescent ; leaves ovate, acuminate ; involucrum large, 

 with obcordate leaflets. 



HAB. Woods. May June. Tree 1530 feet high leaves oppo- 

 site involucrum very large, white, or pale rose-color. 



* * Flowers naked, cymose. 



C. sericea : branches expanded ; leaves ovate, acuminate, silky-ferru- 

 ginous beneath ; cymes depressed, woolly. 



HAB. Shady moist places. June. Shrub 8 12 feet high ; cymes 

 pedunc. ; flower white ; drupe ovate, blue. 



C. circinata : branches verrucose ; leaves broad, oval, (orbicular,) 

 acuminate, white-downy beneath ; cymes depressed. 



HAB. Banks of rivers, woods. June. Shrub 6 8 feet high ; cymt 

 crowded, nearly smooth ; drupe blue. 



C. alba : branches recurved, smooth ; leaves ovate, acute, pubescent, 

 hoary beneath ; cymes depressed. 



HAB. Wet woods. A small tree ; branches slender ; cyme? small 

 drupe white. 



