FLORA OF WASHINGTON AND VICINITY. 135 



Panicum fiUforme, L. Pai^c-Grass. 



September. 



f Panicum sanguinale, Li. Crab-Grass. Crop-Grass. Finger-Grass. 

 July. 



Panicum anceps, Miclix. 



Dry ground; panicle loose; light colored; spikelets 3|'"'" long; fertile flower 

 2mm long ; bristles at the apex of the flowering glume 5 or 6, crowded. Last of Sep- 

 tember or first of October. 



Panicum agrostoides, Spreng. 



Moist ground ; sheaths smooth ; spikelets 2^™™ long. A few conical bristles 

 project from the blunt apex of the flowering glume of the fertile flower, at some dis- 

 tance from the incurved margin. These are often reduced to 2 or 3, well separated 

 from each other. Panicle very dense, purple. Culms flat ; fertile flowers 1™™ long, 

 lanceolate or linear. Last of September or first of October. 



Panicum proliferum, Lam. 



Not common. Late in September. 



t Panicum capillare, L. Old-witch Grass. 



August. 



Panicum virgatum, L 



July, August. 



t Panicum latifolium, L. 

 End of May. 



Panicum latifolium, L., var. molle, Vasey, n. v. 



This variety is soft-velvety throughout and especially on the sheaths and under 

 surface of the leaves; even the culms below the joints are downy, and the joints 

 themselves are bearded with long and very soft white hairs. The flowers are tri- 

 androus and purplish. End of May. 



Panicum clandestinum, L. 



Forms with small heads occur uniting this with wide-leaved states of P. diclwto- 

 mum. June. 



Panicum microcarpon, Muhl. 



The late flowering-time of this species is a convenient means of distinguishing it 

 from any of the broad-leaved forms of P. dichotomum. July. 



Panicum viscidum, Ell. 



Reform School. Last half of July. 



Panicum pauciflorum, Ell. 



High Island. May 25, 1879. 



Panicum dichotomum, L. 



I distinguished twelve well-marked forms, probably embracing several good 

 species. 



Dr. Vasey has kindly given this species a special study expressly for this work, 

 and chiefly from specimens furnished him from this locality by myself or of his own 

 collection, and he makes the following report upon it : 



"It is very diflicult to classify the varieties of this polymorphous species. So far 

 as our forms are concerned, they may be grouped as follows : 



