GEAMINEAE 31 



and spreading : spikelets 2'''-4''' long, linear-oblong: flowering glumes 

 with prominent lateral nerves. — Common in dry soil, especially on sand- 

 bars along the Missouri River. June-October. 



4. E. Frankii Steud. Strongly tufted and much branched through- 

 out, 3'-12'' high : leaves 2'-5'' long : panicle 2'-6' long, V-2' wide : 

 spikelets l^'-lj" long. — Often common in damp sandy fields along 

 rivers. June-October. 



5. E. capillaiis (L.) Nees. Erect, 8'-18' tall, branching only at 

 base : leaves 3'-8' long : sheaths smooth or hairy : panicles often 1° 

 long and 6' wide with widely spreading capillary branches : spikelets 

 somewhat terete, V'-iy long. — Common in dry soil throughout. A 

 form with most of the spikelets 1-flowered occurs south of Grain Valley. 

 July-September. 



6. E. trichodea (Nutt. ) Nash. 2°-4° high, with long, narrow 

 usually smooth leaves : panicle narrow and elongated, sparingly bearded 

 in the lower axils, 1° or more long, S'-i' wide, its branches ascending 

 and capillary, somewhat flexuous : spikelets 2y long. — Sandy grounds 

 in Eush Bottom near Courtney. Local and uncommon. July-Septem- 

 ber. 



7. E. peotinacea (Miohx.) Steud. 1J°-2J° high, with the panicle 

 taking up two-thirds of the plant : leaves about 6' long : sheaths hairy : 

 panicle 8' or more long, 6' or more wide, strongly bearded in the axils, 

 its branches spreading : spikelets 2"-4" long, on pedicels at least 

 their length. — Frequent in sandy fields and prairies and adventized 

 along railroads. July-September. 



40. EATONIA Eaf. 

 Spikelets small, about 2-flowered, in contracted panicles. Two lower 

 glumes empty, very dissimilar, the first acute, linear, keeled and 

 1-nerved, the second strongly obovate, rounded or acute at the apex, 

 3-nerved. Flowering glumes narrower, obtuse, keeled. Palet small and 

 hyaline, 2-nerved. 



Panicle branches narrowly linear and loosely 



flowered. 1. E. Pennsylvanica. 



Panicle branches short and thick, closely flowered. 2. E. obtusaia. 



1. E. Pennsylvanica (DC.) A. Gray. lJ°-3° high, with numerous 

 flat leaves, 2'-6' long : panicle narrow, slender and loosely flowered, 

 3'-12' long, its branches short. — Often common in rich moist woods, 

 especially in the northern part. May-June. 



2. E. obtusata (Miohx.) A. Gray. Very erect, l°-2° high, growing 

 in small clumps : leaves 3'-5'' long, sharp-pointed : panicle 2'-4' long, 

 densely flowered and spike-like, but interrupted at base : branches 1' or 

 less long, erect. — Common in dry soil throughout, in woods and on 

 prairies. May-June. 



