Stenotus. COMPOSITiE. 239 



Rocks, on the wef5lern declivity of the E-ocky Mountains, Nultall! — Stems 

 2-4 inches long, a little lonjrer than the tufted leaves, the latter 1-2 lines 

 wide. Pappus scanty, of about 2 series of unequal bristles, shorter than the 

 corolla. 



46. ISOPAPPUS. 



Heads several-flowered ; the ray-flowers 5-12, ligulate, pistillate, those of 

 the disk 10-20, tubular, perfect. Scales of the cylindrical-campanulate in- 

 volucre lanceolate-subulate, imbricated in 2-3 series, appressed. Receptacle 

 small, alveolate, the alveoli nearly entire. Corolla of the disk slightly 

 dilated upwards, 5-toothed. Appendages of the style subulate, hirsute, 

 much longer than the stigmatic portion. Achenia linear-oblong, terete, at- 

 tenuate at the base, silky-villous. Pappus a single series of capillary sca- 

 brous entirely similar and nearly equal bristles. — Hirsute and scabrous 

 loosely paniculate-branched biennial herbs, with small heads on slender pe- 

 duncles. Leaves alternate, crowded, sessile, lanceolate, 1-nerved and some- 

 what veiny, sparsely hispid-ciliate, often sparingly serrate. 



1. I. divaricatus : glandular-scabrous and sparsely-hispid ; branches and 

 peduncles slender, divaricate-spreading; leaves rigid, linear-lanceolate, very 

 acute, entire or acutely and remotely serrate, tapering towards the base ; 

 scales of the oblong involucre linear-subulate, hairy ; rays 5-8 ; the disk- 

 flowers 7-14. — Chrysopsis divaricafa, Nutt..' gen. 2. p. 162 (under Inula); 

 Ell.! sk. 2. p. 338. C. Laraarckii, Nutt. ! in trans. Amer. phil. soc. I. c. 

 p. 315. Diplopappus ? (Chrysopsis) divaricatus. Hook. ! conipan. to hot. 

 mag. 1. 21. 97. Heterotheca Lamarckii, DC. prodr. 5. p. 317, as to spec, 

 char. & syn. Nutt. c^ Ell. ; excl. syn. Cass. S^- Lam. (which relate to 

 Heterotheca scabra), 4* Pluk. aim., which probably represents Chysopsis 

 Mariana. 



Dry sandy woods and fields, Georgia! to Florida ! Louisiana ! and Tex- 

 as ! Aug.-Oct. — Plant 1-2 feet high, sometimes nearly glabrous when old, 

 with a very effuse panicle ; the filiform pedicels usually minutely glandular 

 and hispid. Heads about a quarter of an inch in length. Pappus ferrugin- 

 ous, not unlike that of a true Erigeron; the bristles rather numerous but in a 

 single series, slender, entirely similar, and nearly all of equal length, a very 

 few being more or less shorter. — On account of the entirely simple pappus of 

 this plant, and its peculiar habit, Mr. Elliott long since suggested the pro- 

 priety of separating this plant from Chrysopsis, but he evidently did not in- 

 tend to include it in his genus Calycium, as De Candolle supposed. It is 

 most nearly allied to the doubtful section of Aplopappus, or perhaps genus, 

 Blepharodon, JJC. ; which, however, has many-flowered heads, a copious 

 pappus of unequal bristles, &c. 



2. I. Hookerianus : stem branched from the base, and with the somewhat 

 spreading branches roughish-liirsute, not glandular ; leaves oblanceolate or 

 oblong-spatulate, fringed with bristles along the attenuate base or margined 

 petiole, obscurely serrulate towards the apex, mucronulate, nearly glabrous ; 

 scales of the short campanulate involucre almost glabrous, subulate-lanceo- 

 late; rays 12 ; the disk-flowers about 20. 



Gonzales, Texas, Drummond ! — Stems about 10 inches high ; the leaves 

 somewhat scattered ; the branches bearing few heads on erect peduncles. 

 Pappus ferruginous. — Only a few specimens having been collected, this 

 species is not to be found in many of the sets of the late Mr. Drummond's 



