COMPOSITE. 173 



spheric, alveolate. Scales of the involucre as long as the disk, 

 in two series, appressed, the margins membranaceous. Ache- 

 nia flat-compressed, smoothish or slightly hispid. Pappus con- 

 sisting of many minute setose bristles ; in the disk florets 2 4 

 of them elongated, subulate and thicker. 



1 . B. glastifolia L'Herit. : leaves lanceolate, somewhat glaucous, the 

 lower serrate ; heads on short pedicels ; achenia ohovate, broadly winged ; 

 awns of the disk pappus many, unequal, two opposite ones thick, elongated 

 and somewhat rigid. 



Banks of streams. Can. Penn. to Car. W. to 111. July, Aug. %.. Stem 3 7 



feet high. Heads in a loose corymb ; rays purplish ; disk yellow. 



Glaucous Boltonia. 



2. D. asteroides L'Herit. : leaves linear-lanceolate, entire or obscurely 

 serrate ; heads on long pedicels, loosely corymbose ; achenia oval, smooth ; 

 pappus very short, similar in the disk and ray, deciduous. Chrysanthemum 

 Carolinianum Walt. 



Swamps. Penn. to Flor. ; rare. Aug. 1\_.Stem 12 feet high. Rays 

 pale purple. Aster-like Boltonia. 



17- CHRYSOPSIS. Nutt. Chrysopsis. 



(From the Greek xP vcro *> gold, and oi//< f , appearance; in allusion to the yel- 

 low color of the flowers.) 



Heads many-flowered; ray flowers in one series, ligulate, 

 pistillate ; those of the disk tubular, perfect. Receptacle flat, 

 subalveolate. Involucre imbricate; the scales linear, acumi- 

 nate. Achenia obovate, compressed. Pappus double; the 

 outer short and chaffy ; the inner elongated, hairy and sca- 

 brous. 



1. C. graminifolia Nutt. : silky ; stem leafy towards the summit; leaves 

 grass-like, lanceolate or linear, acuminate, erect, acute, entire, nerved ; co- 

 rymb compound ; scales of the involucre linear and lanceolate-subulate, 

 subpubescent and glandular on the back. Inula graminifolia, Mich. 



Sandy woods. Del. to Flor. and Louis. Aug. Oct. r H. Stem 1 2 feet 

 high, and with the leaves covered with a silky pubescence. Leaves long, linear 

 or lanceolate-linear. Heads numerous, corymbed ; rays yellow. Closely allied 

 to C. argent ea Ell,, but the leaves are conspicuously nerved, the corymbs gene- 

 rally more compact and the heads more numerous. Grass-leaved Chrysopsis 



2. C. Mariana Nutt. : villous with long and somewhat deciduous hairs ; 

 leaves sessile, elliptic-oblong, rather obtuse, remotely denticulate; lower 

 spatulate-lanceolate, attenuated to a petiole at base ; corymb mostly sim- 

 ple ; scales of the involucre linear, acute, and with the peduncles glandular- 

 viscid. Inula Mariana Linn. 



Sandy woods. N. J. to Car. Aug. Oct. ^.Stem 13 feet high, mostly 

 simple, leafy, sparingly clothed with long hairs. Heads rather large, few, in a 

 terminal somewhat umbellate corymb ; rays 14 18, spatulate-linear, yellow ; 

 disk yellow. Maryland Chrysopsis. 



3. C.falcata EU. : woolly and villous; leaves sessile, linear, very acute, 



