48 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
fifth the length of the spikelet, truncate or obtuse; second glume slightly shorter 
than the sterile lemma, both 7-nerved, palea of the sterile floret obsolete; fruit 2.1 
mm. long, | mm. wide, elliptic, apiculate. 
This very distinct species is known from a single collection only, that distributed by 
Pringle, mentioned above. 
17. Panicum dichotomiflorum Michx. 
Panicum miliaceum Walt. Fl. Carol. 72. 1788, not L. 1753. Since Walter does not 
give Linnus as authority nor use his diagnosis, this is evidently intended as a new 
species. No specimen of this is found in Walter’s herbarium,¢ but the description 
indicates P. dichotomiflorum, which, together with Walter’s name, Elliott® refers 
to P. geniculatum Muhl. 
Panicum dichotomiflorum Michx. Fl. Bor. Amer. 1: 48. 1803. ‘‘ Hap. in occi- 
dentalibus montium Alleghanis.’’ ‘The type is in the herbarium of Drake de Castillo. 
It was sent by Richard, having been collected by Michaux ‘‘ad occidentum montium 
Alleghanis.’’ The specimen of this in the Michaux Herbarium is labeled ‘‘in regione 
Illinoensium.’’ Both of these specimens are the common glabrous form of the United 
States as represented by Chase in Kneucker, Gram. Exs, no. 546. 
Panicum geniculatum Muhl. Cat. Pl. 9. 1813. Based on P. dichotomiflorum Michx. 
The specimen in the Muhlenberg Herbarium is in folio 181, marked “Panicum 
geniculatum (dichotomiflorum) M. 114.” 
Panicum aquaticum Poir. in Lam. Encycl. Suppl. 4: 281. 1816. ‘‘Cette plante 
croit 4 Porto-Ricco; elle m’a été communiquée par M. Ledru.’’ The type, in the 
Cosson Herbarium, is from Porto Rico. In the description the species is compared 
to P. melicarium Michx., and the label of the type bears the abbreviated statement» 
‘“Caff. P. melicario Mich.’”’ In the Desvaux Herbarium there is a similar specimen 
from the Antilles, labeled ‘‘P. aquaticum Desy. in Poir. Enc. Suppl.”’ In both 
specimens the spikelets are nearly 3 mm. long as in Wright 3861. In the original 
publication there is no indication that Desvaux is the author of the species. This 
name was erroneously referred by Hitchcock¢ to P. elephantipes. The fruit is not 
acuminate as in that species 
Panicum multiflorum Poir. in Lam. Encycl. Suppl. 4: 282. 1816. ‘‘Cette plante 
croit 4 la Caroline; elle m’a été communiquée par M. Bosc.’’ We take the specimen 
labeled “‘bosc. caroline,’’ in the Cosson Herbarium, to be the type. Another specimen 
of the same collection is in the Desfontaines Herbarium. It is labeled, ‘‘Am., Sept. 
Bosc,’’ and also ‘‘Panicum brachiatum Bosc.’’? These are the typical form. 
Panicum brachiatum Bosc; Spreng. Syst. Veg. 1: 321, 1825, not Poir. 1816. The 
locality given by Sprengel is ‘‘ Ins. Bermud.’’ As indicated above, the specimen of 
P. multiflorum from Bosc is labeled P. brachiatum Bosc. There is also in the Delessert 
Herbarium a specimen so labeled, collected in South Carolina by Bose. We have 
seen no specimen of Bosc’s from the Bermudas, the published locality, and we 
find no record that Bose visited the Bermudas. The meager description applies 
to P. dichotomiflorum. 
Panicum chloroticum Nees; Trin. Gram. Pan. 236. 1826. Trinius describes a variety 
‘“@ (agreste N. ab Es.)’’ which is the equivalent of the species, and ‘f (sylvestre 
N. ab Es.),” both from Brazil, ‘‘V. utriusque spp. Brasil (N. AB Esens. Lanas- 
porFr).” The latter differs in having a more open panicle, larger spikelets, and 
narrower leaves. Nees@ described the same species later, with three varieties, 
a For an account of Walter’s grasses see Hitchcock, Rep. Mo. Bot. Gard. 16: 31-56. 
1905. 
b Bot. S.C. & Ga, 1: 117. 1816, 
eContr. Nat. Herb, 12: 218. 1909. 
@ Agrost. Bras. 164. 1829. 
