HITCHCOCK AND CHASE—TROPICAL NORTH AMERICAN PANICUM. 509 
72. Panicum haenkeanum Presl. 
Panicum haenkeanum Presl, Rel. Haenk..1: 304. 1830. ‘‘Hab. in Mexico.’”’ The 
_ type specimen is in the herbarium of the National Museum at Prague. The only 
datum on the label is the word ‘‘Mexico.”’ 
Panicum costaricense Hack. Oesterr. Bot. Zeitschr. 51: 428. 1901; Contr. U.S. Nat. 
Herb. 15: 134. 1910. 
For discussion of Panicum expansum Fourn., mentioned in the Revision under P. 
~ costaricense, see page 525 under P. cordovensce. 
~ Field study of this species shows that it is a perennial with straggling culms as 
much as 2 meters long, often rooting at the lower nodes. 
DISTRIBUTION. 
Moist wooded or grassy banks and slopes, Mexico to Panama. 
Costa Rica: Térraba, Tonduz 3628, 
3636, 3673. Boruca, Pittier 
4626. Cordoncillal, Pittier 
3640. Buenos Aires, Tonduz 
3687, 4860, Prtiier 3661. 
Panama: Culebra, Hitchcock 9168. 
Between Corozal and Ancon, 
Pittier 2169, 2636. San Felix, 
Pittier 5247. Between Panama 
and Corozal, Hitchcock 9206. 
oe 6. . Peltier ILO VW, 
Vo ct, 4 cea ili 73. Panicum ineptum sp. nov. 
é VV 4 
DESCRIPTION. 
Fig. 97.—Distribution of P. haenkeanum. 
Plants perennial (?); culms slender, apparently ascending, probably 50 cm. or 
more long, slender, striate-fluted, glabrous or the upper internodes sparsely pilose, 
producing nearly simple branches as much as 25 
cm. long; nodes retrorsely pubescent; sheaths loose, 
shorter than the internodes, pilose, the margins 
densely ciliate; ligule ciliate, about 0.5 mm. long; 
blades spreading, flat, 3 to 7 cm. long, 3 to 6 mm. 
wide, tapering from the truncate base to an acumi- 
I y nate apex, softly pilose on both surfaces; panicles 
AN Ng SWZ terminal, those of the branches short-exserted, 3 to 
x 5 cm. long, consisting of few to several short spread- 
ing densely flowered branches, remote along the 
slender pilose axis, the branches 4 to 6 mm. 
long, bearing 1 to 8 subsessile spikelets, the rachis pilose; spikelets 2.5 to 2.7 mm. 
long, 1.1 mm. wide, blunt; first glume about half as long as the spikelet, 3-nerved, 
obtuse, pubescent; second glume and f 
sterile lemma equal, inflated, much 
larger than the fruit, the glume gibbous. 
in the middle, 7-nerved, pubescent, 
the sterile lemma 3-nerved, glabrous, 
inclosing a membranaceous palea; 
fruit 1.6 mm. long, 0.9 mm. wide, 
elliptical, smooth and shining, the 
lemma strongly convex. 
Type in the herbarium of Krug & 
Urban in the Berlin Botanical Mu- 
seum, the ticket reading ‘‘817 Panicum———S. Domingo, Bertero. Hb. Spr.’”’ Aslipin 
Sprengel’s hand bearsthe name ‘‘ Panicum nemorosum Sw.’’ [Ichnanthus nemorosus]. 
eee, ity Ce 
Fig. 98.—P. ineptum. From type 
specimen. 
Fie. 99.—Distribution of P. ineptum. 
