COMPOSITE. (COMPOSITE FAMILY) 197 



34. A. aciimiiiatiis, Michx. Somewhat hairy ; stem (about 1 high) 

 simple, zigzag, panicled-corymbose at the summit; peduncles slender; leaves 

 oblong-lanceolate, conspicuously pointed, coarsely toothed above, wedge-form and en- 

 tire at the base ; scales of the involucre few and loosely imbricated, linear-lan- 

 ceolate, pointed, thin (3' -5' long); heads few or several; rays 12-18, white, 

 or slightly purple. Cool rich woods, common northward and southward along 

 the Alleghanies. Aug. There is a depauperate narrow-leaved variety on the 

 White Mountains of New Hampshire. 



85. A, nemoraJis, Ait. Minutely roughish-pubescent ; stem slender, 

 simple or corymbose at the summit, very leafy (l-2 high) ; leaves small (!'- 

 l' long), rather rigid, lanceolate, nearly entire, with revolute margins,' scales of the 

 inversely conical involucre narrowly linear-lanceolate, the outer passing into 

 awl-shaped bracts ; rays lilac-purple, elongated. Bogs, pine barrens of New 

 Jersey to Maine along the coast, and northward. Also White Mountains of 

 New Hampshire ; a small form, with solitary heads. Sept. 



36. A. ptarmicoides, Torr. & Gr. Smooth or roughish - }/ stems clus- 

 tered (6' -15' high), simple; leaves linear-lanceolate, acute, rigid, entire, tapering 

 to the base, 1 -3-nerved, with rough margins (2' -4' long) ; heads small, in aflat 

 corymb; scales of the involucre imbricated in 3 or 4 rows, short; rays white 

 (2" -3" long). Dry rocks, W. Vermont to Wisconsin along the Great Lakes, 

 and northward. Aug. 



$ 6. OXYTRIP6LIUM, DC. Scales of the involucre imbricated, without herba- 

 ceous tips, usually very acute, the outer passing into scale-like bracts : pappus soft 

 and capillary: achenia striate. 



37. A. flexnosus, Nutt. Stem zigzag, rigid, forked (6' -20' high); the 

 branches bearing large solitary heads ; leaves linear, thick and fleshy, pointed, entire ; 

 scales of the bell-shaped involucre imbricated in many rows, ovate-lanceolate with 

 awl-shaped points ; rays numerous, large, pale purple. Salt marshes, on the 

 coast, Maine to Virginia. Sept. 



38. A. liiiifdlius, L. Stem much branched (6' -24' high), the branches 

 bearing numerous racemose or panicled small heads ; leaves linear-lanceolate, pointed, 

 entire, flat, on the branches awl-shaped ; scales of the oblong involucre linear-awl- 

 shaped, in few rows ; rays somewhat in two rows, short, not projecting beyond the disk, 

 more numerous than the disk-flowers, purplish. (A. subulatus, Michx.) Salt 

 marshes, on the coast, Maine to Virginia. 



14. KKIOERON, L. FLEABANE. 



Heads many-flowered, radiate, mostly flat or hemispherical ; the narrow rays 

 very numerous, pistillate. Scales of the involucre narrow, nearly equal and 

 almost in a single row. Eeceptacle flat, naked. Achenia flattened, usually 

 pubescent and 2-nerved. Pappus a single row of capillary bristles, with minuter 

 ones intermixed, or with a distinct short outer pappus of little bristles or chaffy 

 scales. Herbs, with entire or toothed and generally sessile leaves, and solitary 

 or corymbed heads. Disk yellow: ray white or purple. (Name from $p t 

 17* 



