TRIANDRIA TRIGYNIA. 



D. Jiliformis : culm erect, filiform ; leaves somewhat glabrous ; spikes 

 2 4, filiform, erect ; spikelets in threes, all pedicellate ; calyx 1- 

 valved, as long as the abortive floret, pubescent. 



HAB. Gravelly soils and sandy woods. Aug. ; culm simple, 12 

 18 inches high, ; leaves short ; spik. mostly 2. 



67. ANDROPOGON. Beard-grass. 



A. scoparium: spikes simple, lateral and terminal, pedunculate, in 



pairs ; rachis hairy ; abortive floret neuter ; valves awned. 

 HA B. Barren soils. Aug. % ; culm 3 feet high ; lower sheaths hairy ; 



spik. slender, Jlexuous. 

 A. furcatum : spikes digitate, generally by fours ; abortive flowers 



stameniferous, awnless, resembling the perfect one, the awn of which 



is subcontorted. 

 HAB. Rocky banks. Aug. Sept. %. ; culm 4 feet high ; radical 



leaves very long ; calyx broicnish. 

 A. nutans : panicle oblong, branched, nodding ; spikelets by pairs ; 



calyx hairy, rufescent ; awn contorted. 

 HAB. Fields and hills. Sept. Oct. 7J.; culm 36 feet high; pan. 



large ; abortive flower a rudiment without valves. 



68. HORDEUM. 



H. jubatum: lateral flowers abortive, neuter; bristles of the calyx 



and corolla three times as long as the flowers. 



HAB. Marshes, tf; culm 2 feet high, slender, simple; bristles of the 

 Jlower capillary. 



TRIGYNIA. 



69. MOLLUGO. Indian-chickweed. 



M. verticillata : leaves verticillate, cuneiform, acute ; stem branched, 



depressed; peduncles 1-flowered. 

 HAB. Fields. July Sept. ; stem prostrate, spreading, dichot. { 



peduncle axillary ; Jlower small, white. 



70. LECHEA. 



Li. major : plant hirsute on every part ; leaves oblong-lanceolate, mu- 



cronate; panicle leafy, pyramidal; branches floriferous towards 



their extremities ; flowers in fasciculate racemes, secund, on short 



pedicels. 

 HAB. Dry woods and hills. Aug. 7J.; stem erect, often surculose ; Jl. 



minute, round; stamens 3 9. 

 L. minor: whole plant nearly glabrous; stem assurgent; leaves 



linear-lanceolate, acute ; panicle leafy ; branches elongated ; flowers 



on short pedicels. 

 HAB. Dry woods. Aug. Sept. Stem slender, 8 inches high ; Jl. 



twice as large as the preceding. 

 L. thy.nifolia : whitish-villose on every part ; stem erect ; leaves linear 



acute ; panicle leafy, elongated ; branches short ; flowers minute, ill 



lateral and terminal fascicles ; pedicels very short. 



