530 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Fig. 144. — Distribution of P. grande. 

 Venezuela: Bobures, John 353. 



DISTRIBUTION. 



Lakes, ponds, and swamps, growing 

 in the water, Panama to Pard.. 



Panama: Gatun, Hitchcock 9178. 

 Along the Sambii River, Pit- 

 tier 5546. 

 Trxnidad : Mazanilla, Hitchcock 

 10376. Cedros, Hitchcock 

 10148. St. Joseph, Hitchcock 

 10022. 



114. Panicxun tuerckheimii Hack. 



Panicum tuerckheimii Hack. Oesterr. Bot. Zeitschr. 12: 60. 1906. Guatemala, 

 Cubilgiiitz [Cubilquitz] im Hochwald, 350 m s m. leg H. v. Txirckheim (1903 sub nr. II. 

 820)." 



DESCRIPTION. 



Plants perennial from a firm knotty base with strong roots; culms erect or ascend- 

 ing, simple, 30 to 50 cm. high, compressed, glabrous, the nodes appressed-hirsute, few 

 to several long erect leaves borne at the base; sheaths compressed-keeled, more or less 

 hispidulous at the junction with the blade, otherwise glabrous, those of the basal leaves 

 loose, overlapping, those of the culm about as long as the in- 

 ternodes; Ugule membranaceous-ciliate, scarcely 0.5 mm. 

 long; blades thin, flat, 10 to 25 cm. long, 2 to 2.5 cm. wide, 

 gradually tapering from about the middle to an acuminate 

 apex, the uppermost rather abruptly narrowed to a some- 

 what rounded ciliate base, the lower and especially the 

 basal blades gradually tapering into a narrow, more or less 

 folded, petiole-like base, ciliate on the margins, puberu 

 lent on the upper surface at the very base; panicle short 

 exserted, 15 to 20 cm. long, less than one-fourth as wide, 

 the slender angled axis and branches glabrous, the branches 

 remote, rather stiffly ascending, with short ascending re- 

 mote branchlets, these spikelet-bearing from the base, 

 more or less pilose in the axils, the lower branches about 10 cm. long; spikelets 

 rather short-pediceled, i-usset brown, 2.5 to 3 mm. long, about 0.9 mm. wide, acum- 

 inate, very sparsely appressed-pilose; first glume minute, hyaline; second glume and 

 sterile lemma rather faintly nerved, subequal, or the ncnminatft tip of the glume 

 exceeding the lemma; the sterile palea wanting; fi-uit 2.4 mm. long, 0.8 mm. wide, 



the lemma and palea not greatly in- 

 durated, the lemma minutely pubes- 

 cent at the pointed apex, the palea at 

 the very tip not inclosed. 



In the original description Professor 

 Hackel states that the first glume is 

 altogether wanting. This appeared to 

 be the case and, failing to note the 

 obscure organ, we excluded this species 

 from the genus Panicum in the Re- 

 vision. ^ The first glume is present, 

 but Is so thin in texture and so closely appressed that the nerves and the base of 

 the sterile lemma are obscurely visible through it. , 



This species, known only from the type collection, has no close allies. 



Fig. 145. — P. tuercliheimii. 

 From type specimen. 



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\Y " 





wV\/~^ 



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*5. 



Fig. 146.— Distribution of P. tuerckheimii. 



^Contr. U. S. Nat. Herb. 15: 16. 1910. 



