I GRASS FAMILY. 



. Trisetum subspicatum (L.) Beauv. Narrow False Oat 

 ra subspicata L- Syst. Veg. Ed. 10, 673. 1759. 

 'tna mollis Michx. Fl. Bor. Am. x: 72. 1803. 

 Trisetum subspicatum Beauv. Agrost. 180. 1812. 



isetum subspicatum var. molle A. Gray, Man. Ed. 2, 

 572. 1856. 



Softly pubescent or glabrous, culms 6 / -2 tall, erect, 

 pie. Sheaths usually shorter than the internodes, 

 ligule W~\" long; leaves i'-4' long, ^"-2" wide; 

 panicle spike-like, i'-5' in length, often interrupted 

 below, its branches \y* f or less long, erect; spikelets 

 3-flowered, the empty scales hispid on the keel, 

 ning, the second about 2^ /x long, the first shorter; 

 ering scales 2 // -2> // long, acuminate, scabrous, 

 ch bearing a long bent and somewhat twisted awn. 



In rocky places, Labrador to Alaska, south on the moun- 

 ns to North Carolina, New Mexico and California. Also 

 Europe and Asia. Aug.-Sept. 



2. Trisetum flavescens (I,.) R. & S. Yellow False Oat. (Fig. 391.) 



A vena flavescens L. Sp. PI. 809. 1733. 

 Trisetum pratense Pers. Syn. x: 97. 1805. 

 Trisetum flavescens R. & S. Syst. a: 663. 1817. 



Culms i^-2^ tall, erect, simple, smooth and 

 glabrous. Sheaths shorter than the intc-roode*. 

 more or less pubescent; ligule %" long; leaves !#'- 

 5' long, i" 5" wide, scabrous, sometimes sparingly 

 hairj-; panicle open, 2'~5' in length, the branches 

 ascending or erect, somewhat flexuous, naked be- 

 low, the lower i'-2 r long; spikelets 3-4-flowered; 

 empty scales smooth and glabrous, the second 

 acute, 2> // long, the first about half as long, nar- 

 rower, acuminate; flowering scales 2 #"-3" loaf, 

 scabrous, bearing a long bent and twisted awn. 



Introduced into Missouri and Kanaaa Native of 

 Europe and Asia. Panicle yellow turning; dull brown. 



July-Aug. 



3. Trisetum Pennsylvanicum (L.) Beauv. 

 Marsh False Oat. (Fig. 392.) 



Avena Pennsylvanica L- Sp. PI. 79. 1753- 

 Avena palustris Michx. Fl. Bor. Am. i: 72. 1803. 



Trisetum Pennsylvanicum Beauv. ; R. & S. Syst. 2: 658. 1817. 



Trisetum paluslreTorr. Fl. U. S. i: 126. 1824. 



Culms i-3 tall, erect, simple, slender and often 

 weak, smooth and glabrous. Sheaths shorter than the 

 internodes, sometimes scabrous; ligule y 2 " long; leaves 

 i'-6' long, !."-?>" wide, rough; panicle 2 / -8 / in length, 

 yellowish, narrow, the branches ascending, the lower i / -2' 

 long; spikelets 2-flowered; outer scales smooth, shining, 

 subequal, the second 2 // -2^ // long; flowering scales 

 2 // -2>^ // long, scabrous, the lower not long-awned, but a 

 rudimentary awn sometimes present, the upper with a 

 long bent and twisted awn. 



In swamps and wet meadows, New York to Illinois, south 

 to Florida and Louisiana. Ascends to 3500 ft. in \ irginia. 

 Panicle sometimes loose and nodding. June-July. 



