Flora of the Palousc Region 193 



long, somewhat pubescent, ciliate on the margins; awns 2, half as long as 

 the akene, retrorsely barbed. Common along Snake River. 



321. MADIA. 



Annuals: leaves linear or lanceolate, entire or slightly toothed, 

 at least the upper alternate: heads peduncled, clustered: flowers 

 yellow; ray-flowers 1-20, pistillate or rarely wanting; disk-flowers 

 perfect: receptacle chaffy only at the margin: pappus none or of 

 several small scales in the sterile flowers: ray-akenes laterally com- 

 pressed, enclosed in the infolded involucral-scales; disk-akenes 

 laterally compressed. 



Disk-flower solitary: slender annual. M. filipes. 

 Disk-flowers several. 



Heads densely clustered. M. glomeraTa. 



Heads racemose or corymbose. M. racemosa. 



M. filipes Gray. Annual, slender, erect, usually branched above, hirsute- 

 pubescent below, glandular above, 10-30 cm. high: leaves linear, 1-3 cm. 

 long: heads 2-3 mm. high, long-peduncled, loosely corymbed: bracts of the 

 involucre 4-8, enclosing as many ray-flowers which scarcely exceed the 

 bracts: disk-flowers solitary: akenes black, obovate, but lop-sided, that of 

 tht- disk-flower straight, those of the ray-flowers curved. Dry ground, 

 rather common. 



M. glomerata Hook. Annual, erect, simple or with erect branches, very 

 leafy to the top, 30-100 cm. high, hirsute, the inflorescence glandular: leaves 

 linear or linear-lanceolate, ascending, 2-6 cm. long, scabrous and hirsute: 

 heads densely crowded, at length somewhat racemose: rays few or none, 

 short; disk-flowers 2-5: corollas pubescent: akenes black, club-shaped, those 

 of the ray-flowers flattened ami i-nerved on each face, those of" the disk- 

 flowers somewhat 4-angled: pappus wanting. Very common. 



M. racemosa Torr. & Gray. Annual, erect, 30-90 cm. high, simple or 

 branched above, hirsute below, glandular above: leaves linear or lanceolate, 

 acute, 2-8 cm. long: heads 6-10 cm. high, hemispherical or broadly ovoid, 

 racemosely or corymbosely arranged, commonly peduncled: corolla pubes- 

 cent: rays 5-8, rarely 10; disk-flowers few: akenes flattened and nerved on 

 the broader faces, or the nerve lacking: pappus none. Very variable and as 

 here described including M. dissitiflora Torr. & Gray, whose supposed dis- 

 tinctions break dowm completely. 



322. LAGOPHYI.LA. 



Annuals: stem slender, much-branched: leaves alternate or op- 

 posite, mostly entire: heads small, few-flowered; ray-flowers about 

 5, pistillate, fertile; disk-flowers as many, perfect but sterile: in- 

 volucre of as many scales as the ray-flowers: receptacle small and 

 flat: pappus none: ray-akenes obovate, much obcompressed, 

 smooth; disk-akenes slender and abortive. 



