14 POACEAE. 



reduced to a scale, or none. Perfect spikelet consisting of 4 scales, the outer 2 

 coriaceous, the second keeled and acute, the two inner hyaline, the fourth more 

 or less awned and subtending a palet and perfect floT\-er. Stamens 1-3. Grain 

 free. [Greek, in allusion to the bearded rachis.] About 150 species, widely 

 distributed in tropical and temperate regions. Type species: Andropogon 

 hirtum L. 



Branches of the inflorescence crowded at the summit of the stem in 1 or more dense 

 corymbiform clusters. 1. A. glomerulus. 



Branches of the inflorescence scattered along the stem in a long 



narrow panicle. 2. A. virginicus. 



1. Andropogon glomeratus (Walt.) B. S. P. Prel. Cat. X. Y. 67. 1888. 



Cinna glomerata Walt. Fl. Car. 59. 1788. 



Andropogon tenuispatJieiis Nash, X. A. Fl. 17: 113. 1912. 



Culms 1.5 dm. high or less, much branched, the ultimate flowering branches 

 forming oblong corymbiform clusters, the nodes of the secondary branches 

 densely barbed. Sheaths keeled; leaf-blades 4 dm. long or less, 3-7 mm. wide; 

 spathes 2.5-3 cm. long, glabrous; racemes in pairs, 1-2 cm. long; sessile spikelet 

 3-4 mm. long, the awn 10-15 mm. long; pedicellate spikelet a rudimentary 

 scale, or wanting. 



Pine-lands, scrub-lands, and savannas, Abaco. Andros, New Providence, Eleuth- 

 era, Acklin's Island, Fortune Island, Crooked Island, Mariguana, Inagua : — south- 

 eastern United States : Mexico : West Indies : tropical continental America. Re- 

 ferred by Dolley to Anatherum macrurum, following Grisebach. Bushy Beard- 

 grass. Bed-grass. 



2. Andropogon virginicus L. Sp. PI. 1046. 1753. 



Culms tufted, 5-10 dm. tall, many times longer than the basal leaves; 

 sheaths, at least the lower ones, more or less tuberculate-hirsute on the margins ; 

 leaves 4 dm. long or less, more or less hirsute on the upper surface near the 

 base; spathes 3-5 cm. long, racemes generally in pairs, 2-3 cm. long; sessile 

 spikelet 3-4 mm. long, the awn 10-15 mm. long; pedicellate spikelet wanting 

 or rarely present as a minute scale. 



Pine-lands and white-lands. Abaco. Elbow Cav, Great Bahamas. Great Sturrup 

 Cay, New Providence, and Watling's Island : — Bermuda ; Massachusetts to Missouri 

 and southward to Mexico; Cuba; Hispaniola ; Jamaica. Virginia Beard-grass. 



5. NAZIA Adans. Fam. PI. 2: 31, 581. 1763. 



Annual grasses, diffusely branched, with flat leaves and 1-flowered deciduous 

 spikelets, either solitary or in clusters of 3-5 in a terminal spike. Scales of 

 spikelet 2 or 3, the outermost small or wanting, the second rigid and' covered 

 with hooked prickles, the third membranous, subtending a palet and perfect 

 flower. [Name unexplained.] Two species, of tropical and temperate regions. 

 Type species: Cenchrus racemosus L. 



1. Nazia aliena (Spreng.) Scribn. Bull. U. S. Dep. Agr. Agrost. 17: 28. 1899. 



Lappago aliena Spreng. Neue Entdeek. 3: 15. 1822. 



Tufted, 1-3 dm. high, the culms often rooting at the lower nodes, slender, 

 glabrous. Sheaths glabrous; leaf -blades 2-8 cm. long, 4 mm. wide or less, 

 their margins ciliate. Inflorescence 4-10 cm. long; spikelets 2-3 mm. long; 

 the second scale bearing prickles 0.5 mm. long or less, the prickles with swollen 

 opaque ba-ses. 



Sandy fields, Grand Turk Island and Ambergris Cav : — southwestern United 

 States to the Argentine ; Cuba to St. Thomas and Antigua'. PRiCKLErGRASS. 



