FLORA OF THE DISTRICT OF COLUMBIA. 79 



36. Panicum addisonii Nash. 



Dry sandy pine woods near the junction of Bladensburg Road and Carters Lane, 

 east of Hyattsville. Coastal Plain, Mass. to S. C. 



A characteristic species of the sand-barrens of the Atlantic Coast; in our region 

 associated with sand-barren species. 



36. Panicum tsugetorum Nash. 



Sandy woods; below the fall line; infrequent. Northeastern U. S., south to Va. 



37. Panicum columbianum Scribn. 



Rocky and sandy woods, especially eastward; frequent. Northeastern TJ. S., 

 south to Va. 

 37a. Panicum columbianum thinium Hitchc. & Chaee. 



Dry sands of the flood plain in a loop of the Eastern Branch, east of Hyattsville. 

 Mas3. to Va. 



A characteristic plant of the sand barrens of the Atlantic Coast. 



38. Panicum sphaerocarpon Ell. 



Open ground everywhere, especially in sandy soil. Eastern U. S. 



39. Panicum polyanthes Schult. 



Moist ground, wood borders, and clearings; frequent, especially below the fall line. 

 Southern Atlantic states to N. J. 



40. Panicum ensifolium Baldw. 



Open spot in white sand magnolia bog, Powdermill Swamp. Atlantic Coastal Plain, 

 north to N. J. 



41. Panicum scribnerianum Nash. 



Sandy open ground; frequent. Me. to Md. and westward. (P. paudfiorum of 

 Ward's Flora.) 



42. Panicum oligosanthes Schult. 



Sandy, usually moist, open woods; below the fall line; infrequent. Southern 

 states, north to N . J. 



43. Panicum ravenelii Scribn. & Merr. 



Sandy or rocky open woods; frequent. Southern states, north to Md. 



44. Panicum scoparium Lam. 



Wet open ground, wood borders, and along streams; below the fall line; common. 

 Southern states, north to Mass. (P. vistidum Ell.) 



45. Panicum aculeatum Hitchc. & Chase. 



Boggy wood borders and thickets; Takoma Park (type locality), Brightwood, and 

 east of Hyattsville. Coastal Plain from Long Iel. to N. C. 

 A rare species. 



46. Panicum ashei Pearson. 



Sterile or rocky oak and pine woods; common. Eastern U. S. 

 A characteristic plant of laurel and blueberry hillsides. 



47. Panicum commutatum Schult. 



In less sterilo woods than those occupied by P . ashei, the two occasionally growing 

 together; common. Eastern U. S. 



48. Panicum clandestinum L 



Moist open ground and wood borders and along streamlets; common. Eastern U. S . 

 The ripe grains remaining in the crowded sheaths well into the winter afford food 

 for birds. 



49. Panicum latifolium L. 



Rich rocky woods along the Potomac above Washington; frequent. Eastern TJ. S. 

 (P. macrocarpon LeConte.) 

 60. Panicum boscii Poir. 



Wooded slopes everywhere; common. Eastern U. S. (P. portcrianum Nash.) 

 60a. Panicum boscii molle (Vasey) Hitchc. & Chase. 



Same habitat as the species; commoner. Eastern U. S. (P. latifolium molle Vasey.) 



