ORDER CXLII. — GRAMINACIC.E. 591 



the joints. ranicle slender, crowded, not sccund ; ppikidpts 4 — 7, 

 flowered. Glumes small; exterior p.doa concave, hairv, awned. — O- 

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



3. F. tenel'la, (AVilld.) Stem erect, geniculate at the bast'. I^ave$ 

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

 simple ; spikelets 6 — O-flowered. Glumes uiiecjually scabrous. I'alcic 

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

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



4. F. DURius'cuLA, (L.) Stem erect, glabrous. Leaves subulate, sca- 

 brous. i-*a7iic/c erect, sccund, short ; spikelets 6 — 8 flowered. Glumes 

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

 fields. 12 — 18 inches. 



6. F. NUTANS, (Willd.) Ste7n erect, terete, glabrous. Leaves linear- 

 lanceolate, glabrous. Panic/e secund, nodding ; spikelets 3 — 6 flowt-red, 

 compressed. Flowers unawned. — U- June— July. Woods. 2 — 3 ft, 



6. F. PARViFLOUA, (Ell.) Stem slender, glabrous. Leaves linear, al- 

 most filiform. Panicle slender; spikelets subulate, terete, S-floweri'd; 

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



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

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

 exceeding 4 times the length of the glumes. — Geo. and northwar<l. 



8. F. polysta'chya, (Mich.) {L^eptochloa pohjstachya, Kunth.) Stem 

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

 longer than the joints. Particle secund, erect; s|»ikelets about lo-llow- 

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

 exterior palcae awned and keeled. — U- Sept. — Oct. Wet soils. 

 1—2 feet. 



Genus XXXIII.— BRO'MUS. L. 

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



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

 which are imbricated in 2 rows ; lower j)aiea cordate, emarsri- 

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

 smooth. 



1. B. WiLLDEN'Ow'ii, (Kunth.) Sheaths of the leaves bvarded at the 

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

 pressed, 8-flowered, awnless. — Carolina. 



Ceratoehloa xiniolcidet, Heauv. 



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

 Leaves and sheaths hairy. 7^a;</c/e nodding ; spikes slender, cylindri- 

 cal. G^/w^nes pubescent ; exterior palea pubeseent, eiliate ; uwu nearly 

 as long as the valve, interior one much snuiUer. 



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

 Leaves pubescent on the upper surface, eiliate. Panicle er«'ct or noil- 

 ding, branched; sj)ikelets oldong-ovate, compresf^ed ; florets al>out 10, 

 distinct, longer than the bristles.— O- J^b'- Cultivated land.'*. 2— .S 

 feet. 



4. B. pur'gans, (L.) .S^wi erect, glabrous. Leaves ^Ciihro\i<> ; i^hvMh'* 

 villous. Pan'cle nodding, dilfuse ; jieduncles hairy; cf^kelet!* 1— C- 

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

 awned, hairy at the summit— 1(. July — Sept. Mountain-. 1—2 ft. 



