POLY GONE ^. 153 



2. (). douilroidea, Nutt. PL Gamb. 16\) (1848). Bresignoa ChiUmh, 

 Reiny, in Gay. Fi. Ohil. v. 292. Atl. t. 58 (1849). Very slender and diffuse, 

 1 ft. IukIi : leaves linear-oblaneeolate, }-2 — l^g in. lonjjr, acute, hirsute : 

 bracts unequal, awnless, linear or linear-oblong : involucres turbinate, 

 ^2 — l^a lines lonj? (excluding the short awns), unequally 3 — 4-lobed, those 

 in the forks on slender pedicels 1 — 4 lines long, the rest subsessile • fi. 

 rose-color, % line long. — Also of the Nevada deserts, but doubtless 

 occurring within the borders of our State. 



H— H— J HroJitcrt'g irilhont nwns, hristli/ or naked. 



3. 0. iiierinis, Wats. Proc. Am. Acad. xii. 273 (1878), and Erioqoimm 

 vogaiix, 1. c. XX. 370 (1885). Slender and low, 3—6 in. high, rather diffuse: 

 leaves broadly oblanceolate, 1 in. long, glabrous except the scabrous- 

 ciliate margins : bracts linear-oblong, acute, awnless : involucres short- 

 pedicelled, 4-cleft almost to the base, the oblong-lanceolate lobes 1 line 

 long, acute but awnless : fi. rose-color, y^ li^^ long : achenes obtusely 

 triangular. — Supposed to have been found originally on Mt. Diablo, Mtsx 

 M. J. Baiicrofi, but better known from parts of the State lying south- 

 ward beyond our limits. 



4. 0. hirtiflora, Greene. Gray, Proc. Am. Acad. xii. 259 (1878), 

 under Eriogonuiii. Glandular-xjuberulent and viscid, 6 in. high, erect, 

 cymose-paniculate above : leaves 1 in. long, oblong-spatulate, with 

 scabrous-ciliate margins and a broad red midvein : bracts hispidulous, 

 oblong, I4 in. long or less, acutish : involucres awnless, ^2 line long, on 

 slender erect or nodding pedicels 1 — 3 lines long : fl. 3 — 5, very hirsute, 

 rose-red, J 3 line long. -Foothills of the Sierra in Tuolumne and Calaveras 

 counties, Hooker ct Gray, also near lone. Parry. 



5. 0. spergulina, Greene. Gray, Proc. Am. Acad. vii. 389 (1868), 

 under Eriogouum: Oxytheca Reddingiana, Jones, Bull. Torr. Club, ix. 

 32 (1882). Very slender, diffusely branched from the base, 3 in. to 2 ft. 

 high, of a dull dark green or purplish, nearly glabrous, or somewhat 

 glandular-hispid : leaves linear-oblaneeolate, I3 — 2 in. long, more or less 

 hirsiite : x^edicels very slender, ^4 — % ^^- long, spreading : involucres 

 turbinate, I4 line long, deeply 4-cleft, glabrous, awnless, 1— 2-flowered, 

 the pedicels without bracteoles : perianth white or pinkish, I3 — 1 line 

 long, slightly glandular-puberulent at base : achene lenticular. — In the 

 middle and higher altitudes of the Sierra, from Kern Co. northward. 



8. CHORIZAXTHE, Robert Brown. Dichotomous annuals with few 

 and mostly basal leaves ; the branches with ternate bracts at the nodes. 

 Involucres 1 — 3-flowered, sessile, more or less tubular, coriaceous or 

 chartaceous, often corrugated or reticxilate, 3 — 6-angled or ribbed, with 

 as many cuspidate or rigidly awued teeth or segments. Flowers rarely 



