30 THE SEEDS OF THE BLUEGRASSES. 
indistinct or evident only below the middle; keel and marginal veins silky pubescent 
below the middle or higher on the keel, which is hispid at the apex; surface between 
the marginal veins and keel appressed pubescent at the base; web wanting; palea 
nearly or quite equal to the glume, its keels not arched as in Poa annua, slightly 
silky pubescent below the middle and hispid-ciliate above; rachilla segment glabrous, 
_varying from no longer than wide to one-third the length of the glume; aborted 
floret of the sterile rachilla segment minute; grain 14 mm. long, keeled and grooved, 
semitranslucent, dark reddish brown, granular. (Fig. 12.) 
Fig. 12.—Seeds of alpine meadow grass (Poa alpina): a and b, back views; c-e, side views; /-h, front 
views; h, a terminal floret. 
The seed of Poa alpina is not on the market and is not likely to be 
found in commercial seeds. Individual seeds of P. alpina closely 
resemble those of P. annua, but are to be distinguished by the indis- 
tinct intermediate veins of the glume, the variable rachilla segment, 
and especially by the keels of the palea, which are slenderer, not 
arched, less pubescent, and strictly hispid-ciliate above. The plant is 
alpine and occurs in the northern part of the United States as far 
west as Colorado, in Canada and Alaska, and in Europe and Asia. 
Poa sudetica Haenke. 
Spikelets 2 or 3 flowered; florets 3-4 mm. long, lanceolate or ovate-lanceolate; 
apex acute or acuminate; glume somewhat arched and strongly keeled at the back, 
light brown or dark brown, sometimes tinged with purple; margins of the glume 
narrowly infolded below the middle, narrowly hyaline-edged above the middle and 
not flaring at the apex; all the veins distinct, never silky pubescent, usually hispid; 
Fic. 13.—Seeds of Poa sudetica: a and b, back views; -c-e, side views; f and g, front views; g,a terminal 
floret. 
general surface scabrous or sometimes glabrous; web not present; palea equaling or 
somewhat exceeding the glume and often separated from it at the apex in florets 
having a well-developed grain; keels of the palea hispid-ciliate, mostly exposed and 
more or less evident from the side; rachilla segment varying from one-fifth to one- 
third or even one-half the length of the glume, glabrous or scabrous, sterile rachilla 
