SUNFLOWER FAMILY 555 
Achenes truncate-fusiform, the pig narrower Sie the wae of the fruit. 
Paleae conspicuous, at least 1.0 m . M. bigelo 
Pabiex Leeititicite seca: tecliekly. 0. Pie mm, long. ” M. houatiadt tenella, 
Achenes over 3.0 mm. long. 
Paleae averaging 1.0 mm. long or 
Palea 
Shaan pe eae the midrib ay stout, tapering, joirwions ee to one- 
* ift h of the maximum palea w 11. M. acum 
Paleae circular to 3a oe. the stout or slender midrib techie less than 
or la clad 
one-fifth of the maximum palea 
Paleae arcuate only at Nee agen, aia and flat rey the midrib linear, abruptly 
thickened at the . M. bigelovii. 
Paleae — lonicue pe margins ica < convolute, the midrib linear 
tapering He the bas 
Palens Bac, sper y 5, minutely scabrous, am, ae lightly smoky, the margins 
sapere the ved. . M, campestris. 
Paleae 23 or fewer, villous to rine ig ‘lee, clear or chalky to tawny or 
blackish, the margins strong 
Paleae eg iy srg tool to rea a ge" age of the. ‘promot achenes 
a mm, shorter has the rs Pe or of equaling or exceeding it 
then the latter more than 4.5 mm, long. 
10. M. douglasti douglasit 
10. M. douglasii tenella. 
Paleae 1 
Paleae mostly less than 1.0 mm. long. 
= 
6 
ontiittl tery, 
+ \\\ 
ony Nothocalais troximoides 
959. Micros eris borealis 
cna: 
