124 PC ACE A E 



7. Sporobolus argutus (Nees) Kunth. Stems 3 dm. tall or less, erect, or sometimes 

 decumbent at the base : leaf-blades 2-5 cm. long, 2-4 mm. wide, acuminate : panicle 4-8 

 cm. long, its branches at first appressed, finally widely spreading : spikelets 1.5-1. 8 mm. 

 long. 



On prairies, Kansas and Colorado to Louisiana and Texas. Also in Mexico and the West Indies. 

 Summer and fall. 



8. Sporobolus Doming6nsls (Trin,) Kunth. Stems 3-5 dm. tall, erect : leaf-blades 

 2 dm. long or less, 3-5 mm. wide, long-acuminate : panicle 8-15 cm. long, its branches at 

 first erect, finally spreading : spikelets about 2 mm. long. 



In moist often brackish places, southern peninsular Florida. Also in Mexico and the West 

 Indies. Summer. 



9. Sporobolus ejuncidus Nash. Stems tufted, 3-6 dm. tall, erect, slender : leaf- 

 blades filiform or setaceous, the basal numerous, 1.5-3 dm. long, those on the stem few, 

 2.5-8 cm. long : panicle 7-18 cm. long, open, its branches finally widely spreading : spike- 

 lets 2.5-3 mm. long, purple, the empty scales very unequal, the first ^-J as long as the 

 second, the flowering scale equalling the second and the obtuse palet. [/ junceus ( Michx. ) 

 Kunth.] 



In dry sandy soil, Virginia to Florida and Texas. Spring to fall. 



10. Sporobolus heterdlepis A. Gray. Stems 3-10 dm. tall, erect : leaf-blades in- 

 volute-setaceous, the basal ones about f as long as the stem, sometimes equalling it, those 

 on the stem shorter : panicle 7-25 cm. long, its branches erect or ascending : spikelets 

 4-5.5 mm. long, the empty scales unequal, acuminate, the lower subulate, about as long 

 as the broad second one, sometimes awn-pointed, the flowering scale obtuse or acute, ex- 

 ceeded by the second or occasionally equalling it. 



In dry soil, Quebec to Assiniboia, Pennsylvania, Arkansas and Nebraska. Summer and fall. 



11. Sporobolus Curtissii (Vasey) Small. Stems tufted, 4-8 dm. tall, slender, erect, 

 wiry : leaf-blades erect, 2.5 dm. long or less, 1-1.5 mm. wide, stiff, often involute : panicle 

 1.5-2 dm. long, its branches ascending : spikelets 5-6 mm. long, the scales acute, the empty 

 ones unequal, the second equalling or somewhat shorter than the flowering one. 



In sandy soil, Georgia, Florida and Alabama. Summer and fall. 



12. Sporobolus Floridanus Chapm. Stems 6-12 dm. tall, erect, stout : leaf-blades 

 broad, flat, 4 dm. long or less, 4-5 mm. wide, linear, abruptly acute : panicle 2-4 dm. 

 long, oblong, its branches ascending or erect-ascending : spikelets 4.5-5 mm. long, the 

 empty scales acute, unequal, the second a little shorter than or about equalling the flower- 

 ing scale which is acute or obtusish and about as long as the palet. 



In sandy soil, Georgia and northern Florida. Fall. 



13. Sporobolus Buckley! Vasey. Stems 5-8 dm. tall, erect : leaf-blades 3 dm. 

 long or less, 3-7 mm. wide, flat, narrowed toward the base, long-acuminate above : panicle 

 1.5-2.5 dm. long, its branches at first erect, finally ascending : spikelets 1.5 mm. long, the 

 scales very acute. 



In valleys, southern Texas. Also in Mexico. Summer. 



14. Sporobolus cryptandrus (Torr. ) A. Gray. Stems 4-12 dm. tall, erect: leaf- 

 sheaths with a dense tuft of long hairs on each side at the apex : blades 7-15 cm. long, 2-4 

 mm. wide, flat, long-acuminate : panicle 1.5-2.5 dm. long, its branches spreading or 

 ascending : spikelets 2-2.5 mm. long, the scales acute. 



In sandy soil, along the coast of New England and of the Great Lakes, to North Dakota, and in 

 the interior in Missouri and Texas. Also in Mexico. Summer and fall. % 



15. Sporobolus fndicus (L. ) R. Br. Stems 3-12 dm. tall, erect, tufted : leaf-blades 

 2-6 mm. wide, attenuate into a long slender points, the basal ones 2-3 dm. long : panicle 

 1-4 dm. long, usually much elongatepl, narrow, dense, spike-like : spikelets 1.5-2 mm. 

 long. 



In fields and waste places, Virginia to Florida, Arkansas and California. Naturalized from trop- 

 ical regions. Summer and fall. 



16. Sporobolus asperifolius Nees & Meyen. Stems 1.5-5 dm. tall, erect, decum- 

 bent and branching at the base, from a slender rootstock : leaf-sheaths short, crowded and 

 overlapping ; blades numerous, 2-9 cm. long, 2-3 mm. wide, very rough above : panicle 

 7-20 cm. long, included at the base, rarely entirely exserted, the capillary branches 

 spreading or ascending : spikelets sometimes 2-3-flowered, 1.5 mm. long. 



In dry soil, Assiniboia and British Columbia to Missouri, Texas and southern California. Also in 

 Mexico. Summer and fall. 



17. Sporobolus Virginicus (L. ) Kunth. Stems 1.5-6 dm. tall, erect, from a stout 

 rootstock : leaf -sheaths numerous, short, overlapping, crowded on the lower part of the 

 stem ; blades 2.5-20 cm. long, 4 mm. wide or less at the base, distichous, long-acuminate, 



