HITCHCOCK AND CHASE TKOPICAL NORTH AMEEICAN PANICUM. 509 



72. Panicum haenkeanum Presl. 



Panicum haenJceanum Presl, Rel. Haenk.l: 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 Foum., mentioned in the Revision under P, 

 costaricense, see page 525 under P. cordovensc. 



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: T^rraba, TonduzZQi2S, 



3636, 3673. Boruca, Pittier 



4626. Cordoncillal, Pittier 



3640. Buenos Aires, Tonduz 



3687, 4860, Pittier 3661. 

 Panama : Culebra, Hitchcoch 9168 . 



Between Corozal and Ancon, 



Pittier 2169, 2636. San Felix, 



Pittier 5247. Between Panama 



and Corozal, Hitchcoch 9206. 



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73. Panicum ineptum ep 



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Fig. 97.— Distribution of P. Menkeanuvi. 



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description. 



-P. ineptum. From type 

 specimen. 



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- 

 nate apex, softly pilose on both surfaces; panicles 

 terminal, those of the branches short-exserted, 3 to 

 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 



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'shand bearathe name "Panicum nemorosum Sw." [Ichnanthus nemorosusj. 



Fig. 99.— Distribution of P. ineptum. 



