COMPOSITE. (composite FAMILY.) 197 



34. Aa acmninatHS, 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- 

 lire 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 northwai-d and southwai'd along 

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

 White Mountains of New Hampshire. 



S5. A* nemordlis, Ait. Minutely roughish-pubescent ; stem slender, 

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

 1^' long), rather rigid, lanceolate, nearly entire, loith 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> ptarnticoides, 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 a flat 

 arrynih; 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. 0XYTEIP6L1 U M, DC. — Scales of the involucre imbricated, without herba- 

 ceous tips, usually very acute, the outer posing into sccde-lilce 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. linifolins, L. Stem much branched (6' -24' high), the branches 

 bearing numerous racemose or panided 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 beymd the disk, 

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

 marshes, on the coast, Maine to Virginia. 



14. EBtCtEROW, L. Pleabanb. 



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. Receptacle 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 Reaves, and solitary 



or corymbed heads. Disk yellow: ray white or purple. (Name from Tjp, 

 17* 



