631 



ARTEMISIA, L. 



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

 beneath, pinnatifld, 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 high) ; 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; 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 the perfect flowers capillary, of the pistillate flowers 

 none. Low woolly annuals. 



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

 the involucre and chaff 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, with pinnatifid-toothed clasping leaves, and 

 large bracted heads of yellow flowers. 



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

 Alabama (Mohr). Ne'w Orleans (Riddell). Introduced. 



NABALUS, Cass. 



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

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

 terminal raceme; involucre of 8 or 9 hirsute scales, 12 - 14-flowered ; pappus 

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

 Leaves small. Flowers cream-color. 



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

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

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

 Roan Mountain (Chickering). 



ORDER LOBELIACE^E. 



LOBELIA, L. 



L. Canbyi, Gray. Stem simple, or branching above (l-2 high) ; 

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



