GRASS FAMILY. I7I 
1. Trisetum subspicatum (L,.) Beauv. Narrow False Oat. (Fig. 390.) 
Aira subspicata I,. Syst. Veg. Ed. 10, 673. 1759. 
Avena mollis Michx, Fl. Bor. Am. 1:72. 1803. 
Trisetum subspicatum Beauv. Agrost. 180. 1812. 
Trisetum subspicatum var. moille A. Gray, Man. Ed. 2, 
572. 1856. 
Softly pubescent or glabrous, culms 6’—2° tall, erect, 
simple. Sheaths usually shorter than the internodes, 
ligule 14’’-1’’ long; leaves 1/-4’ long, 14’/-2/’ wide; 
panicle spike-like, 1/-5’ in length, often interrupted 
below, its branches 114’ or less long, erect; spikelets 
2-3-flowered, the empty scales hispid on the keel, 
shining, the second about 214’’ long, the first shorter; 
flowering scales 2’/-2'5’’ long, acuminate, scabrous, 
each bearing a long bent and somewhat twisted awn. 
In rocky places, Labrador to Alaska, south on the moun- 
tains to North Carolina, New Mexico and California. Also 
in Europe and Asia. Aug.—Sept. 
2. Trisetum flavéscens (L.) R. & S. Yellow False Oat. (Fig. 391.) 
Avena flavescens I,. Sp. Pl. 809. 1753. 
Trisetum pratense Pers. Syn. 1:97. 1805. 
Trisetum flavescens R. & S. Syst. 2: 663. 1817. 
Culms 114°-2'%° tall, erect, simple, smooth and 
glabrous. Sheaths shorter than the internodes, 
more or less pubescent; ligule %’’ long; leaves 1%4/— 
5/ long, 1’’-3’’ wide, scabrous, sometimes sparingly 
hairy; panicle open, 2’—5’ in length, the branches 
ascending or erect, somewhat flexuous, naked be- 
low, the lower 1/-2’ 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 213//-3/’ long, 
scabrous, bearing a long bent and twisted awn. 
Introduced into Missouri and Kansas. Native of 
Europe and Asia. Panicle yellow, turning dull brown. 
f\ gy ee July—Aug. 
3. Trisetum Pennsylvanicum (L.) Beauv. 
Marsh False Oat. (Fig. 392.) 
Avena Pennsylvanica I,. Sp. Pl. 79. 1753. 
Avena palustris Michx. Fl. Bor. Am. 1:72. 1803. 
Trisetum Pennsylvanicum Beauy.; R. & S. Syst. 2:658. 1817. 
Triselum palustre Torr. Fl. U.S. 1: 126. 1824. 
Culms 1°-3° tall, erect, simple, slender and often 
weak, smooth and glabrous. Sheaths shorter than the 
internodes, sometimes scabrous; ligule %4’’ long; leaves 
1’-6’ long, 1’’-3/’ wide, rough; panicle 2/—8’ in length, 
yellowish, narrow, the branches ascending, the lower 1/—2/ 
long; spikelets 2-flowered; outer scales smooth, shining, 
subequal, the second 2//-2%4’’ long; flowering scales 
2/’-2'4’’ 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 Virginia. 
Panicle sometimes loose and nodding. June-July. 
