XOBELIACEJE. 631 



ARTEMISIA, L. 



A. vulgaris, L. (Mug wort.) Stem branching; leaves white-downy 

 beneath, pinnatifiii, with the lobes lanceolate ; heads downy, in slender ter- 

 minal spicate panicles ; flowers all perfect. — Waste grounds, North Carolina. 

 Introduced. 



A. biennis, Willd. Biennial, smooth ; stem simple (l°-3° higli) ; leaves 

 1-2-pinnatifid, the linear lobes sharply toothed; heads crowded in terminal 

 and axillary spikes, which form a long narrow leafy panicle ; flowers all 

 perfect. — West Tennessee. 



FILAGO, L. Cudweed. 



Heads discoid, many-flowered j the central flowers perfect, but often abor- 

 tive, the outer ones very slender and pistillate. Involucre of few woolly 

 scales. Lower part of the long or top-shaped receptacle chaffy, the upper 

 part naked. Pappus of tiie perfect flowers capillary, of the pistillate flowers 

 none. — Low woolly annuals. 



F. Germanica, L. Stem forking ; leaves lanceolate, entire ; scales of 

 tlie involucre and cliaff" cuspidate. — Waste ground. Introduced. 



CNICUS, Vahl. 



Heads many-flowered, the central flowers sterile. Scales of the involucre 

 produced into a long pinnate spine. Receptacle bristly. Achenium terete. 

 Pappus in 3 rows ; the outer row consisting of 10 horny teeth ; the middle 

 row of 10 longer bristles alternating with the inner row of 10 bristles. — A 

 prostrate villous annual herb, witii pinnatifid-toothed clasping leaves, and 

 large bracted heads of yellow flowers. 



C. BenedietUS, L. — Coast of South Carolina (Elliott). Montgomery, 

 Alabama (Mohr). New Orleans {Ridddl). Introduced. 



NABALUS, Cass. 

 N. asper, Torr. & Gray. Rough-pubescent; stem simple; leaves oval- 

 oblong, sharply-tootlied ; heads erect, clustered, forming a compound villous 

 terminal raceme ; involucre of 8 or 9 hirsute scales, 12- 14-flo\vered ; pappus 

 straw-color. — Barrens of Tennessee, and northward. — Stem 2° -4° high. 

 Leaves small. Flowers cream-color. 



N. Roanensis, Chickerlng. Hirsute; stem low (3'- 12' high) simple; 

 leaves hastate, acuminate, coarsely toothed, tlie lower ones petioled ; raceme 

 compound; involucre 10 -13 flowered ; pappus straw-color. — Summit of 

 Roan Mountain {Chickerlng), 



Order LOBELIACE^. 



LOBELIA, L. 



L. Canbyl, Gray. Stem simple, or branching above (10-2<^ High); 

 leaves numerous, linear, glandular-denticulate ; racemes long, loosely flow- 



