52 PANK'ACE^. 



A very variable species, with many varieties and forms, appar- 

 ently running into A. macrourus Michx. with all its forms. Flor- 

 ida, Chapman; Louisiana, Langlois ; Pennsylvania, Garber 

 319. 



Sandy land, Massachusetts to Florida and Texas. 



Var. glaucusHack. D. C. Monog. Phan. 6: 411 (1889). Florida, 

 Curtiss 36o8b. A slender, glaucous plant. 



Var. tetrastachyus (Ell.) Hack. Monog. Phan. 6:411. A. 

 tetrastachyus Ell. Bot. >S. C. and Ga. 150 (1817). Slender, spikes 

 usually in clusters of 4. 



Florida, A. H. Curtiss 3633; Alabama, Mohr. 



17. A. macrourus Michx. Fl. Bor. Am. 1 : 56 (1803). 



Culms usually erect, stout. Branches numerous, in typical 

 plants, mostly near the top of tlie culm. Pedicels often 5 mm. 

 long. After studying many plants, the above are all the essen- 

 tial differences that I can discover whicli hold good between this 

 plant and A. Virginkms L. U. S. Dept. Agric. 191 ; Florida, 

 Curtiss for Scribner 3(;30 ; Texas, NeaUey for Nat. Mus. 



New Yoi'k to Florida and west to Southern California. 



Var. abbreviatus Hack. D. C. Monog. Phan. 6 : 408 (1889). 

 Eather low, culms narrow ; panicle dense, obovate-oblong. 10-15 

 cm. long; rays short, springing from 3-4 nodes ; secondaries 

 solitary. Spathes about equalling the racemes. 



New Jersey (A. Gray). Plant seen by me now in Herb. Gray. 



Var. corymbosus Chapm. The brandies borne in one or more 

 spreading corymbose panicles. Florida, Curtiss 3639c. 



Var. glaucopsis Ell. Bot. S. C. and Ga. 1 : 150 (1816). 

 Plant rather slender, glaucous, the numerous brandies paniculate 

 for 30-40 cm. or more at the top. Tiiis includes var. riridis 

 Chapm. 



Florida, Curtiss 3639b, d. 



Var. hirsutior Hack. D. C. Monog. Phan. 6 : 409 (1889). 

 Sheaths green, villous with tuberculate hairs; blades smooth, very 

 scabrous. Panicles ample, with many branches 20-50 cm. long. 

 Spathes scabrid. 



Florida, Curtiss 3639, now in Herb. Gray. 



