1906] Lamson-Scribner, The Genus Sphenopholis 139 



filiformis or, as now understood, either the glabrous or pubescent 

 form of ohiusata. The latter (pubescent) form is by far the more 

 common in the region specified. 



Sprengel in 1807 published Aim pallens -and Aira nitida. In ISIO 

 he named the latter species Aira pennsylvanica. In 1813, Muhlen- 

 burg published Aira inmraUi based upon .4?m o/^/i/.m/a of Michaux 

 and in 1817 he published Aira pallens, apparently based upon the 

 grass which has been more recently known as Eatonia penmylvanica 

 in which the second floret is awned and doubtless the same as Aira 

 ■pallens Sprengel. Muhlenberg notes that awnless forms occur and 

 evidently referred to these in his catalogue (1813) under the name of 

 Aira pallens mutica. A vena palustris of :Michaux, :Muhlenburg treats 

 as a di.stinct species. 



Torrey (1824) describes two species and one variety under Koeleria : 



1. Koeleria pennsylvanica, based u]x)n De CandoUe's Koeleria 

 pennsylvanica ^ith Aira mollis Muhl. and Aira pennsylvanica Spr. 

 as synonyms. The grass described is Eatonia nitida. 



2. Koeleria truncata, based n\)on Aira truncata Muhl. wdiich is 

 the Aira obtusata of Michaux. The grass described is the Eatonia 

 pennsylvanica of A. Gray. The subspecies major, of Torrey, is 

 certainly valid and includes Eatonia intermedia of Rydberg. 



Elliott in his Sketch of the Flora of South Carolina and Georgia, 

 1816, describes two species, Aira obtusata Mx. and Aira mollis Muhl. 

 Under the latter, he describes as a variety, Eatonia filiformis Vasey, 

 but does not name it. 



Trinius, in 1830, describes two species under Trisetum (Sect. 

 Colobanthus), namely: T. pennsylvanicum, based upon Aira pennsyl- 

 vanica Sprengel and Trisetum lohatnm, which is Eatonia obtusata 



(Mx.). 



Endlicher in 1837 takes up Eatonia of Rafinesque for Reboulea of 

 Kunth (1830) and cites Aira obtusata Michx. as representing the genus. 



Desvaux, Journ. Bot. 1808, refers Aira obtusata of Michaux to 

 Airopsis. 



Kunth in 1830 establishes Reboulea as a new genus to include Aira 

 obtusata Mx. giving the latter a new name, Reboulea gracilis. 



Gray in the first edition of his Manual (1848) takes up Reboulea 

 of Kunth and describes two species with one variety; 1. Reboulea 

 penn.^ylvanica, describing the grass now generally recognized as 

 Eatonia pennsylvanica, but citing Koeleria pennsylvanica DC, which 



