346 



culms, and in the size and form of the panicle, and the arrange- 

 ment of its spikelets. The culms arise from a creeping base, a 

 character about which Lamarck says nothing, his specimens 

 probably not exhibiting this feature. It differs from P. agrostoides 

 Muhl. in the ciliate margins of the sheaths, in the shorter leaves, 

 the smaller spikelets, and the creeping base of the stem. In P. 

 agrostoides Muhl. the leaves are much elongated, the margins of 

 the sheaths entirely naked, and the culms are caespitose, or at all 

 events not creeping at the base. 



The plants in the herbarium of Columbia University to which 

 allusion is made, and which are referable to this species, are : 



" I. F. Holton, La Paila, April 19, 1853, No. 91," sent out in 

 his distribution of plants from " Neogranadina-Caucana." 



" Graminaceae. Saxicolae. Ripariae. Truandofalls. Schott 

 II. 858," and in red ink " No. 6." 



"Ur. Madiana, Turk's Island." 



Panicum Atlanticum n. sp. 



Whole plant, with the exceptions noted below, papillose-pilose, 

 with long white spreading hairs, the hairs on the upper surface of 

 the leaves and on the summit of the culm scantier, those on the 

 lower surface of the leaves shorter. Culms caespitose. at length 

 branched, 3-5 dm. tall, erect or ascending, the nodes barbed with 

 spreading hairs, a bare ring about i mm. long below each node ; 

 sheaths shorter than the internodes; ligule a ring of hairs 2-5 mm. 

 long; leaves erect, rigid, thickish, linear-lanceolate, 3-10 cm. long, 

 4-7 mm. wide, acuminate, rough on the margins, 7-1 1 -nerved, the 

 middle leaves the longest; panicle broadly ovate to orbicular, 4-6.5 

 cm. long, 3-7 cm. wide, its main axis somewhat pilose at the base, 

 the remaining portion, as well as the ascending somewhat flexuous 

 branches and their divisions, hispidulous, the lower branches 

 2.5-4.5 cm. long ; spikelets many on hispidulous pedicels several 

 times their length, obovate, about 2 mm. long, about 1.3 mm. 

 broad, obtuse, the first scale about one-half as long as the spikelet. 

 broadly ovate, acute, sparingly pubescent, i -nerved, the second 

 and third scales equal in length, membranous, orbicular when 

 spread out, 9- nerved, densely pubescent with short spreading 

 hairs, the third scale enclosing a hyaline palet about one-half its 

 length, the fourth scale chartaceous, oval to almost orbicular, about 

 1.75 mm. long, enclosing a palet of equal length and similar tex- 

 ture. 



Type specimens collected by the writer on dry somewhat 

 shaded knolls in the grounds of the New York Botanical Garden. 



