288 monocotylodDnous. 



Genus VIII. RHYNCOSPORA. 



Glumes collected into a spike, inferior ones without flowers* 

 Palece none. Seed 1, crowned with a persistent style, sur- 

 rounded by bristles. 



1 R Alba. Stem slender, glabrous, 3-angled at the summit. Leaves li- 

 near, channeled, glabrous. Spikes in corymbose clusters, axillary and terminal. 

 Glumes nearly white. Seed tuberculate, surrounded by 10 bristles. 



May — June. Common. 10-12 in. 



2 R Rahiflora. Stem leafy setaceous. Leaves glabrous setaceous. 

 Flowers in lateral and terminal panicles. Glumes 5-7, the exterior ones 

 smallest, the two interior resembling palese. Bristles 3-4. 



% April — May. In bogs, common. 10-12 in. 



3 R Plumosa. Stem erect, glabrous, 3 angled, slender. Leaves linear, 

 with scabrous margins. Flowers terminal crowded. Glumes ovate, awned. 

 Sieed rugose, with 6 plumose bristles. 



% June — Aug. Pine barrens. 8-12 in. 



4 R Cymosa. 5^em terete, erect. Z-eares linear, glabrous, concave. Flow- 

 ers in axillary and terminal panicles. Gluvies usually 6, with the outer ones 

 ferruginous, the inner one white, 2-flowered. See^Z compressed, oval. Bris- 

 ties 6. 



% Through the summer. Bogs and ditches. 1-3 ft. 



5 R LoNGiRosTRis. Stem triangular, erect, glabrous. Leaves linear-lan- 

 ceolate, channeled, glabrous. Flowers in corymbose panicles, axillary and 

 terminal. Glumes usually (i, with the flowers between the fifth and sixth 

 glumes. Seed compressed, terminated by a long persistent style. 



% July— Oct. Wet places. 3-6 ft. 



6 R Distans. ^^em triangular, /^eaves glabrous, serrulate, linear. Flowers 

 in axillary clusters. Spikes sessile, the clusters pedunculate. 



%- June — Sept. Damp soils. 1-2 ft. 



7 R Punctata. Stem triangular, slender. Leaves linear-lanceolate, with 

 scabrous margins. Flowers in lateral and terminal fascicles, clustered at the 

 summit. Glumes mucronate. Seed compressed. 



"ll- July — Aug. Damp places. 1-2 ft. 



8 R Capitellata. Stem erect, triangular. Flowers in spherical, axilla- 

 ry heads. Leaves setaceous, shorter than the stem. Seed compressed, sur- 

 rounded by scabrous bristles. 



% May— Sept. Wet places. 1-2 ft. 



9 R Inexpansa. Siem somewhat triangular, generally inclined. Leaves 

 linear, channeled. Flowers in axillary and terminal panicles, pendulous. 

 Seed compressed, surrounded by scabrous bristles. 



% Through the summer. Wet soils. 1--2 ft. 



10 R Caduca. Stem triangular, erect. Leaves linear-lanceolate, glabrous, 

 serrulate. Flowers in axillary panicles ; spikelets sessile. Seed rough, sur- 

 rounded by bristles. 



% July — August. Damp soils. 1-2 ft. 



11 R Sparsa. ^<em triangular, erect. Xeaves linear-lanceolate, glabrous, 

 serrulate. Flowers in diffuse axillary panicles. Seed rough, surrounded by 



bristles. 



% Wet soils. May Aug. 1-2 ft. 



Genus IX. FUIRENA. 



Glumes arranged in a spike, on all sides, awned. Palece, 3, 

 petaloid, awned, cordate, unguiculate. 



