678 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



with a few long hairs. 91 — Margins of swamps and wet places in 



pine barrens near the 

 coast, North Carolina to 

 Florida and Texas; West 

 Indies (fig. 1519). 

 10. Agrostoidea. — Tufted 

 perennials; culms 

 erect, compressed; 

 sheaths keeled; 

 ligules membranace- 

 ous, mostly about 1 

 mm long; spikelets 

 short-pedicel ed, 

 lanceolate, pointed, 

 5- to 7-nerved, gla- 

 brous; glumes and 

 sterile lemma mostly 

 keeled; fruit smooth 

 and shining with a 

 minute tuft of thick- 

 ish hairs at apex. 

 147. Panicum agros- 

 toides Spreng. (Fig. 

 1520.) In dense clumps 

 from a short crown, with numerous short-leaved innovations at base; 

 culms 50 to 100 cm tall; 

 blades erect, folded at base, 

 flat above, 20 to 50 cm long, 

 5 to 12 mm wide; panicles 

 terminal and axillary, 10 to 

 30 cm long, half to two-thirds 

 as wide, sometimes more 



Figure 1513.- 



-Panicum havardii. 

 floret, X 10. 



Two views of spikelet, and 

 (Type.) 



Figure 1515.— Distribution of 

 Panicum amarum. 



diffuse, the densely flowered 



branchlets mostly on the 



under side of the branches, 



the pedicels usually bearing 



at the summit one to several 



delicate hairs; spikelets about 



2 mm long. % — Wet 



meadows and shores, Maine to Kansas, south to Florida and Texas; 



Vancouver Island; California (fig. 1521). 



148. Panicum condensum Nash. (Fig. 1522.) Resembling P. 

 agrostoides; culms on the average taller; blades often sparsely pilose 



Figure 1514.— Panicum amarum. Two views of spikelet, 

 and floret, X 10. (Vasey, Va.) 



