772 



C. SKOTTSBERG 



upper, abruptly contracted at summit into a smooth, cylindrical, whitish crown, 

 and an awn of 35 — 50 mm, twice geniculate, the third segment straight or nearly 

 so. None of the specimens examined, whether cited by HlTCllCOCK or not, have 

 a dark brown lemma, it is white or whitish in all except two, where it is very 

 light brown. The contraction into a crown may be rather abrupt, but just as 

 often it is not (see pi. 55: i — 11). The size of the anthers often provides a good 

 character in grasses as in other plants, but they are so easily caducous that they 

 are rarely observed in dried specimens. In the two cases where mature anthers 

 were seen they measured 2.5 — 2.7 mm. Macbride 1283 differs from ordinary 

 mucronata in the lemma being glabrous except at base, as in neesiana (pi. 55: 5)- 

 The specimens from Argentina and Chile approach neesiava in this respect. The 

 awn is rarely over 40 mm long in mucronata. — Table I. 



The characteristic features of 7ieesmna are, if we follow Tkinius and RUPRECHT, 

 the subequal, about 14 mm long glumes, the 6 — 7 mm long lemma which is 

 villous at the base only, the pubescence extending in a dorsal line half way up, 

 and the long awn, 50 mm or more. Of the specimens I have seen only one 



