124 POACEAE 
7. Sporobolus argütus (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. 
QE prairies, Kansas and Colorado to Louisiana and Texas. Also in Mexico and the West Indies, 
Summer and fall. 
8. Sporobolus Domingénsis ( 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 ejáncidus 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 em. 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 1-3 as long as the 
second, the flowering scale equalling the second and the obtuse palet. [S. junceus ( Michx. ) 
Kunth. ] 
In dry sandy soil, Virginia to Florida and Texas. Spring to fall. 
10. Sporobolus heterólepis A. Gray. Stems 3-10 dm. tall, erect: leaf-blades in- 
volute-setaceous, the basal ones about $ 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. Stemstufted, 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 Floridànus 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 Buckleyi 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. Alsoin Mexico. Summer. 
14. Sporobolus cryptándrus (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 Indicus (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 
e dm. long, usually much elongated, narrow, dense, spike-like : spikelets 1.5-2 mm. 
ong. 
In fields and waste places, Virginia to Florida, Arkansas and California. Naturalized from trop- 
iealregions. Summer and fall. 
16. Sporobolus asperifdlius 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. ilong, 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 Virgínicus (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, 
