STATE GEOLOGIST. 173 



[Two others of the forms included under P. dlchotomum in Gray's Manual, but sep- 

 arated from it by appendix of Chapman's Floraofthe Southern States, with the descrip- 

 tions here quoted, are recognized by Dr. Vasey (Grasses of U. S.) as distinct species, 

 namely, P. laxiflorum, Lam. (culms tufted, smooth, 6 to 12 inches high; leaves lance- 

 olate, acuminate, clliate, mostly pale yellowish-green, 2 to 3 inches long, the villous 

 slieaths shorter than tlie internodes ; panicle diffuse, plumose-bearded, rather few- 

 flowered; spikelets scattered, oval, densely pubescent, the upper glume 7-nerved; neu- 

 tral flower bipaleaceous ; fertile flower acute : on dry sandy ground), and P. kamul- 

 osuM, Michx., in part (low, 6 to 8 inches high, tufted, very smooth and shining ; culm 

 mostly purple ; leaves linear ; panicle VA to 2 inches long, diffusely branched, many- 

 flowered; spilielets minute, purple, very smooth, the upper glume and neutral palet 

 5-nerved : in sandy woodlands) ; both of which are common in the eastern states, but 

 have not yet been observed so far northwestward as Minnesota.] 



P. depauperatiini, Muhl. Panic-Grass. 



Throughout the state. Lapliam. BlueEartli county, Leiberg; Emmet county, 

 Iowa, Cratty. [Lake Superior, Whitney, Manitoba, Macoun ] 



P. Crus-galli, L. Barnyard-Grass. 

 Common throughout the state. 



P. Crus-galli, L., var. liispiduni, Gray. Cockspur Grass. 



Rock and Pipestone counties, etc. (frequently seen attaining a very rank growth 

 beside roads where they cross creeks or boggy land, apparently indigenous), Leiberg. 



SET ARIA, Beauv, Bristly Fox-tail Grass. 



S. verticillata, Beauv. Bristly Fox-tail Grass. 



Mankato, ieibergr. Rare. 

 S. glauca, Beauv. ^^Pigeon-Grass." Foxtail. 



Common, often abundant, throughout the state. 

 S. viridis, Beauv. ^^Pigeon-Grass.'' Green Foxtail. Bottle-Grass. 



Also common, or abundant. In cultivated ground, with tlie last. 

 S. Italica, Kunth. Millet. Bengal-Grass. 



Becoming a bad weed in flax-fields in the southern part of the state, Leiberg; New 

 Ulm, Juni. 



CENCHRUS, L. Hedgehog-Grass. Bue-Grass. 

 C. tribuloldes, L. "Sand-bur." Hedgehog- Grass. Bur-Grass. 



Common, or frequent, in sandy lands along the Mississippi and Minnesota rivers. 

 (Occasionally attacked by smut, as at Minneapolis in 1884.) 



ANDROPOGOI^", L. Beard- Grass. 



A. furcatus, Muhl. " Blue-Joint." Beard-Grass. Forked Spike. 



Common, or abundant, throughout the prairie region of the state ; extending north- 

 east at least to Crow Wing county, Upham, and the lake of the Woods, Dawson. Highly 

 esteemed for hay; southwestward it is usually called "Blue-Joint," a name which 

 properly belongs to Deyeuxia Canadensis. 



A. scoparius, Michx. Beard-Grass. Broom-Grass. 

 Common, with same range as the last. 



CHRYSOPOGON, Trin.* Chrysopogon. Beard-Grass. 

 C. nutans, Benth. (Sorghum nutans. Gray.) Indian Grass. Wood-Grass. 

 Common, with same range as the two last ; making good hay. 



* Chrysopogon, Trin. Flowers loosely paniculate. Fertile spikelets one-flowered, 

 sessile between two pedicellate male or barren spikelets at the end of the slender 



