Sorghastrum Tripsaceae 181 



Point Township of Posey County where it often overtopped the corn. A 

 pioneer in that vicinity informed me that he thought it was introduced 

 about 1890. 



Probably a native of Africa. 



Sorghum vulgare var. sudanense (Piper) Hitchc. Sudan Grass. This 

 is an annual grass which has been recently introduced as a forage crop 

 but there are no reports that it has escaped and become established. 



Probably a native of Africa. 



Sorghum vulgare Pers. Sorghum. This is the cultivated sorghum, of 

 which there are many varieties. It has been cultivated from pioneer 

 times in this state, but there are no reports that it has perpetuated itself. 



Nat. of Africa. 



148-134B. SORGHASTRUM Nash 



1. Sorghastrum nutans (L.) Nash. Indian Grass. Map 336. This 

 is essentially a prairie grass and is found in "oak openings" which are 

 remnants of prairies. It is frequent throughout the state where prairie 

 habitats occur and is rare or absent elsewhere. It is sometimes found in 

 marshy places and its most common associate is Andropogon furcatus. 



Maine, Que. to Man. and N. Dak., southw. to Fla. and Ariz. ; Mex. 



12. TRIPSACEAE Hitchc. Corn Tribe 



157-103. TRIPSACUM L. 



1. Tripsacum dactyloides L. Eastern Gamagrass. Map 337. I have 

 found this species only twice. A few colonies were in a low, wet woods 

 about three fourths of a mile southeast of the old Spencer School, about 

 10 miles southwest of Mt. Vernon, Posey County ; and it was common along 

 a ditch through a low field about 5 miles east of Lincoln City, Spencer 

 County. I moved two colonies to Bluffton 6 years ago, and they are hardy 

 and spreading. 



Mass. to Mich., Iowa, and Nebr., southw. to Fla. and Tex.; W. I. and 

 Mex. to Brazil. 



159-102. ZEA L. 



Zea Mays L. Corn. This is our cultivated corn. It appears spontane- 

 ously but does not become established. Origin probably in Central America 

 or southeastern Mexico. 



20. CYPERACEAE J. St, Hil. Sedge Family 



Flowers all perfect, rarely some of them with stamens or pistil abortive. 



Basal empty scales of spikelets none, rarely 2, and sometimes 3 in Eleooharis 

 Smallii. 

 Scales of the spikelets strictly 2-ranked, conduplicate and keeled. 

 Flowers without bristles; achenes beakless; inflorescence terminal. 



Spikelets few- to many-flowered, usually elongated or slender 



459. Cyperus, p. 183. 



Spikelets 1-flowered (but of 3 or 4 scales), glomerate in sessile heads 



462. Kyllinga, p. 190. 



