ORDER CXLII. GRAMINACE^E. 591 



the joints. Panicle slender, crowded, not secund ; spikelets 4 — 7, 

 flowered. Glumes small; exterior palea concave, hairy, awned. — 0. 

 March — April. Dry soils. 6 — 12 inches. 



3. F. tenel'la, (Willd.) Stem erect, geniculate at the base. Leaves 

 subulate, pubescent and scabrous on the upper surface. Panicle secund, 

 simple ; spikelets 6 — 9-flowered. Glumes unequally scabrous. P alecs 

 longer than the glumes ; exterior valve keeled, awned. — %. April — 

 May. Dry soils. Common. 6 — 12 inches. 



4. F. duiuus'cula, (L.) Stem erect, glabrous. Leaves subulate, sca- 

 brous. Panicle erect, secund, short ; spikelets 6 — 8-flowered. Glumes 

 acute, unequal. Palece unawned, interior one small. — June to July. In 

 fields. 12—18 inches. 



5. F. nutans, (Willd.) Stem erect, terete, glabrous. Leaves linear- 

 lanceolate, glabrous. Panicle secund, nodding ; spikelets 3 — 6 flowered, 

 compressed. Flowers unawned. — If. June — July. Woods. 2 — 3 ft. 



6. F. parviflo'ra, (Ell.) Stem slender, glabrous. Leaves linear, al- 

 most filiform. Panicle slender ; spikelets subulate, terete, 5-flowered ; 

 exterior palea awned. — If. April — May. Pine-barrens. 12 — 18 in. 



7. F. quaduifo'lia. (Walt.) Leaves setaceous, upper ones lanceolate. 

 Panicles contracted, secund ; florets lanceolate ; awn terminal, scabrous, 

 exceeding 4 times the length of the glumes. — Geo. and northward. 



8. F. polysta'chya, (Mich.) (Leptochloa polystachya, Kunth.) Stem 

 procumbent, branching, glabrous. Leaves narrow, subulate ; sheaths 

 longer than the joints. Panicle secund, erect; spikelets about 10-ilow- 

 ered ; the exterior glume small, the interior larger and awned ; the 

 exterior palese awned and keeled. — If. Sept. — Oct. Wet soils. 

 1—2 feet. 



Genus XXXIII.— BRO'MUS. L. 

 (From bromos, food ; the ancient name of the Oat.) 



Glumes 2, usually many-flowered, shorter than the florets, 

 which are imbricated in 2 rows ; lower palea cordate, emargi- 

 nate, with an awn sometimes below the summit. Scales ovate, 

 smooth. 



1. B. Willdenow'ii, (Kunth.) Sheaths of the leaves bearded at the 

 throat. Panicle nodding, spreading ; spikelets oblong-lanceolate, com- 

 pressed, 8-flowered, awnless. — Carolina. 



Ceratochloa wiioloides, Beauv. 



2. B. cilia'tus, (L.) Stem slender, swollen and hairy at the joints. 

 Leaves and sheaths hairy. Panicle nodding ; spikes slender, cylindri- 

 cal. Glumes pubescent ; exterior palea pubescent, ciliate ; awn nearly 

 as long as the valve, interior one much smaller. 



3. B. secali'nus, (L.) Stem glabrous, swollen at the joints, erect. 

 Leaves pubescent on the upper surface, ciliate. Panicle erect or nod- 

 ding, branched; spikelets oblong-ovate, compressed; florets about 10, 

 distinct, longer than the bristles. — 0. July. Cultivated lands. 2 — 3 

 feet. 



4. B. pur'gans, (L.) Stem erect, glabrous. Leaves scabrous ; sheaths 

 villous. Panicle nodding, diffuse ; peduncles hairy ; spikelets 4 — 6- 

 fiowered. Glumes pubescent, the interior one awned ; exterior palea 

 awued, hairy at the summit. — If. July — Sept. Mountains. 1 — 2 ft. 



