COMPOSITE. 169 



4. D. cornifolius, Darl. Cornel-leaved Diplopappus, 



m slender, low. pubescent and loosely panieled above; leaves elliptical or ovate- 

 lanceolate, acuminate, ciliate-birsute ontbe margin, bairy on tbe veins beneatb. 

 Woods. July— Sept. Stem 1 to 2 feet bigb. L»aves conspicuously pointed a1 

 u.ls. pale beneath on very short stalks. Heads usually few, on rather rigid 

 peduncles. Rays white. 



13. BOLTONIA, L'Her. 



In honor of J. Bolton, a botanist of the last century. 



Heads many-flowered, the ray-flowers, numerous, pistillate; 

 those of the disk tubular, perfect. Involucre hemispheri- 

 cal with imbricated appressed scales, somewhat in 2 rows, 

 crowned with narrow membraneous margins. Receptacle 

 conical, punctate. Achenia flat 2 or 3 winged. Pappus 

 of several minute bristles with 2 to 4 longer awns. — Smooth 

 branching perennial herbs, with lanceolate entire, sessile leaves, and 

 loosely corymbose heads of flowers, with white or purplish rays. 



1. B. asteroides, L'Her. Aster-like Boltonia. 



Leaves entire or obscurely serrate; pappus of few minute bristles and no awns; 

 achenia broadly oval. 



Moist places, along streams. July — Aug. Stem 3 to 6 feet high, with a diffusely 

 branched summit. Leaves 2 to 6 inches long by % to y 2 wide, reduced upwards to 

 •us bracts 1 to 2 inches in length. Heads terminal on the filiform bractlets. 

 Hays purple, % mc k long. 



2. B. glastifolia, L'Her. Glaucous Boltonia. 



Leaves lanceolate, somewhat glaucous ; pappus of several short bristles., and 2 or 

 3 more or less prolonged awns ; achenia obovatc, broadly winged. 



Pvich moist soil. Sept. Stem 3 to 7 feet high. Stem leaves 2 to 4 inches long by 

 li te % wide, those of the branches smaller. Heads in a loose corymb. Bays pur- 

 plish, % of an inch long. D-isfi: yellow. 



14. SERICOCARPUS, Nees. 



Gr. serikos, silky, and Icarpos, fruit. 



Heads 12 to 15-flowered ; ray-flowers 4 to 8 pistillate ; 

 ■disk-flowers 6 to 10, perfect. Involucre oblong or club- 

 shaped, closely imbricated with appressed cartilaginous scales 

 in several rows with short and abrupt green tips. Recepta- 

 cle alveolate-toothed (honey-comb-like). Achenia short, 

 obconic, very silky. Pappus simple, of capillary bristles. — 

 Perennial tufted herbs, with sessile alternate leaves, and small clus- 

 tered heads of flowers ivith white rays and yellow disks, disposed in 

 a flat corymb. 



1. S. solidagineus, Nees. Narrow-leaved Sericocarpus. 



Smooth ; stem erect, slender; leaves linear, rigid, obtuse, entire, with rough mar 

 gins obscurely 3-nerved, tapering to the base; heads very small, in close clustery 

 few-£owered: rays slender. 



Z' 



