Bicknell: Ferns and flowering plants of Nantucket 189 



Coskaty. The other form, met with sparingly at 'Sconset and 

 Wauwinet, is more softly and densely pubescent, with firmer, 

 duller-green leaves, sometimes 8 mm. wide, and is branched from 

 the base and sometimes quite prostrate. In both forms the partly 

 included primary panicles were freshly in flower. 



* Panicum atlanticum Nash. 



Frequent or rather common in dry grassy places, sometimes 

 growing with P. Scribnerianum. After the middle of August 

 spikelets remain only on the secondary panicles. 



On Saul's Hills a greener form with unusually narrow and 

 long-attenuate leaves was collected. 



Panicum Scribnerianum Nash. 



Common in dry sandy fields ; secondary panicles only. 



* Panicum spherocarpon Ell. 



Common in dry places ; panicles often perfectly fresh. 



Panicum clandestinum L. 



■ 



Locally common in low grounds but by no means generally 

 distributed. Past flowering. 



* Panicum mattamusketense Ashe. 



Panicum Clutei Nash. 



Common in cranberry bogs and open wet places. After the 

 middle of August few spikelets remain on the primary panicles. 

 Very variable, either stout or slender, sometimes only 4 dm. high 

 with leaves 4-6 mm. wide and panicles 4-6 cm. long, again 8-10 



dm. tall, the leaves 10-14 mm. wide, becoming 11 cm. long, and 



panicles 8-10 cm. in length. On Nantucket this little-known 

 grass is usually smaller than the same species on Long Island 

 and in New Jersey, and differs also in a marked tendency towards 

 firmer and paler green leaves, smaller, fewer-flowered panicles, and 

 generally reduced pubescence. It is sometimes strongly sugges- 

 tive of a modified open ground form of Panicum boreale Nash. 



Panicum Clutei Nash has been attributed to Nantucket and 

 held to be distinct from P. mattamusketense (Scribner & 

 Rhodora 3 : 95, 97, 119, 120. My 1901). The type specimen of 

 the former in herb. N. Y. Bot. Garden can be distinguished by 

 no material character from authentic examples of P. matta- 

 musketense from North Carolina. The latter is somewhat more 



M 



