COMPOSITE. (COMPOSITE FAMILY.) 237 



glabrous. Pappus of 2 - 8 rigid deciduous awns or bristles. Perennial herbs, 

 with alternate leaves, aud siugle heads of yellow flowers terminating the 

 branches. 



1. G. lanceolata, Nutt. Glabrous, corymbosely branching (l-2 high) ; 

 leaves lanceolate, sessile, sharply serrate ; involucre glutinous, the scales 

 nearly equal, ending in a filiform point , bristles of the pappus mostly 2. 

 Tennessee, Alabama, aud westward. 



26. AMPHIACHYRIS, Nutt. 



Heads small, radiate. Rays pistillate, fertile. Disk flowers perfect lint 

 sterile. Scales of the top-shaped involucre few and rigid. Pappus of the 

 disk flowers of 5-8 bristle-like scales; of the rays minute or obsolete. A 

 low much branched glabrous annual, with linear alternate leaves and yellow 

 pedicellate flowers. 



1. A. dracunculoides, Nutt. Colbert County, Alabama (Mohr), 

 and westward. August. 



27. BACCHARIS, L. 



Heads dioecious, many-flowered ; the flowers all tubular. Corolla of the 

 sterile flowers 5 cleft; of the fertile filiform, nearly entire; style exserted. 

 Scales of the oblong or hemispherical involucre imbricated in several rows. 

 Receptacle naked or somewhat chaffy. Achenia ribbed. Pappus of the ster- 

 ile flowers capillary, in a single row, as long as the involucre ; of the fertile 

 flowers iu 1 -several rows, commonly much lunger than the involucre. 

 Smooth and resiuous shrubs. Leaves alternate. Flowers white. 



1 . B. halimifolia, L. Leaves obovate, or oblong-obovate, toothed above 

 the middle, the uppermost lanceolate, entire; heads peduncled the terminal 

 ones clustered; pappus of the fertile flowers 3-4 times as long as the invo- 

 lucre. Low ground near the coast. Sept. - ( >ct. Shrub 2 12 high. 



2. B. glomeruliflora, Pers. Leaves wedge obovate, coarsely toothed, 

 rigid ; the uppermost obovate, entire ; heads very numerous, in dense sessile- 

 axillary clusters ; pappus of the fertile flowers twice as long as the involucre. 

 Swamps along the coast, Florida to North Carolina. Nov. Shrub C- 

 12 high. 



3. B. angustifolia, Michx. Leaves linear, entire ; heads single, or 2 - 

 4 in a terminal cluster; achenia smooth. Saline marshes, Florida to North 

 Carolina. Oct. Shrub 4 - 8 high. Heads small. 



28. INULA, L. ELECAMPANE 



Heads many-flowered. Rays pistillate. Scales of the involucre iml ricr.te 1 

 in several rows. Receptacle flat or convex, naked. Anthers bicaudate at tl e 

 base. Pappus single, of capillary slightly scabrous bristles. Perennial 

 herbs. Flowers vellow. 



1. I. Helenium, L. Stem stout; leaves large, ovate, denticulate. t<>- 

 mentose beneath ; the lowest ones petioled, the upper clasping ; heads very 



