198 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Fig. 200.— Distribution of P. caerulescens. 



DISTRIBUTION. 



In marshes and swampy woods, southeastern New Jersey to Florida, west to Missis- 

 sippi; also in the Bahamas and Cuba. 



New Jersey: Cape May, Stone in 1909. 



Virginia: Lynn Haven, Chase 5417, Hitchcock 356. 



Florida: Levy County, Combs 803; Titusville, Chase 3992; Miami, Hitchcock 706, 



715; Homestead, Hitchcock 690; 



Braidentown, Hitchcock 965; 



Myers, Hitchcock 897, 904, 915. 

 Alabama: Fort Morgan, Tracy 



8401. - 

 Mississippi: Horn Island, Tracy in 



1903. 

 Bahamas: New Providence, Brit- 

 ton & Brace 597, 599, Mills- 



paugh 2182, Northrup 248; 



Great Bahamas, Brace 3524, 



Britton & Millspaugh 2506, 



2668; Andros, Brace 7015 (all in 



Field Mus. Herb.); New Providence, Eggers 4305 (Hackel Herb.), Eggers 



4312 (Krug & Urban Herb.). 

 Cuba: Without locality, Wright 3463 in part. 



114. Panicum lucidum Ashe. 



Panicum lucidum Ashe, Journ. Elisha Mitchell Soc. 15:47. 1898. " Collected in 

 June 1898 by the writer in deep, shady swamps bordering Lake Mattamuskeet, 

 N. C." There is no specimen in Ashe's herbarium from the type locality, but there 

 is a specimen of the vernal form in the National Herbarium collected by Ashe in 

 1898 at Lake Mattamuskeet. This specimen is either the type or a duplicate type. 

 The label is in Ashe's handwriting. 



Panicum taxodiorum Ashe, Journ. Elisha Mitchell Soc. 16:91. 1900. "Type: 

 K. K. McKenzie's no. 460. Hummocks in cypress swamps. Lake Charles, La., 

 September 1890." The type, in Ashe's herbarium, is a specimen passing from the 

 vernal to the autumnal form and showing the early branching condition. 



description. 



Vernal form at first erect and resembling that of P. dichotomum, but the weak culms 

 soon becoming decumbent, sometimes rooting at the lower nodes; sheaths glabrous, 

 usually ciliate on the margin; blades thin, bright green, shining, glabrous, at first 

 erect, but soon widely spreading, 4 to 7 cm. long, 4 to 6 mm. 

 wide; panicles resembling those of P. dichotomum but 

 fewer-flowered; spikelets 2 to 2.1 mm. long, 1 mm. wide, 

 elliptic, glabrous (rarely obscurely pubescent); first glume 

 about two-fifths the length of the spikelet, pointed; second 

 glume and sterile lemma more strongly nerved than in 

 P. dichotomum, both shorter than the fruit at maturity; 

 fruit 1.7 mm. long, 0.9 mm. wide, slightly pointed. 



Autumnal form repeatedly branching, forming large 

 clumps or mats of slender, weak, vine-like culms, the 

 branches elongated and diverging at a wide angle, not 

 fascicled, the blades 2 to 4 cm. long, waxy, flat and spreading; panicles much reduced, 

 with few long-pediceled spikelets; basal blades linear-oblong, as much as 10 cm. long. 

 Under a lens the oblong epidermal cells are visible between the nerves in the blades, 

 especially on the lower surface, giving a minutely bullate surface characteristic of 

 this species and of no other in this group. 



Fig. 201. — P. lucidum. From 

 type specimen in National 

 Herbarium. 



