AND GENERA OF PLANTS. 387 



sheathing,, with the summit free and foliaceous; discal florets dark brown, masculine. Receptacle 

 convex, villous. 



*MADORELLA. 



Madia, but with the achenium compressed, and without angles, or nearly so. 

 Rays pubescent at the base, trifid, as long as the involucrum. Discal florets 

 subcylindric, with a pubescent tube. Stigmas filiform, acute, slenderly and 

 glandularly pubescent. Receptacular palese in a single series. — Biennials, 

 with slender, virgate stems; capituli subglobose, naked, pedunculate; leaves 

 entire, linear. Flowers pale yellow. — Nearly allied to Madia, but with a 

 different habit and stigma. 



Madorella * racemosa; hirsute, the involucrum also glandular; leaves linear, 

 acute, the lowest ones opposite, radical ones only subserrulate ; flowers axillary 

 and terminal, racemose. 



Hab. On the banks of the Oregon, near the estuary of the Wahlamet. Stem slender, rigid and 

 twiggy, involucrum of about twelve carinate embracing sepals, with leafy tips. Rays rather long, 

 trifid, their styles filiform, nearly smooth, and equal. Discal florets five-toothed, pale yellow, 

 numerous, all fertile : a single row of leafy scales outside the discal florets, the rest of the receptacle 

 naked. Achenium smooth, finely gi-anulated as in Madia, 



Madorella * dissitiflora; hairy and viscid; stem slender, virgately branched; 

 flowers axillarj^, lateral and terminal, shortly pedicellate; leaves linear sessile, 

 on the branches very short. 



Hab. In the Blue Mountains and plains of the Oregon. A slender, often much branched twiggy 

 plant, with naked flowers, and a very viscid, almost spherical involucrum. Achenium granulated, 

 flat, slightly and obsoletely angular. Rays- small, trifid, pale yellow. 



*MADARIOPSIS. 



Madarta, but with the discal florets fertile, and a very strongly tuberculated 

 achenium in both ray and disk; that of the ray curved, and unequally three- 

 sided, with a small, oblique rostrum and an acumination at base; the central 

 achenia unequally five-sided, compressed, the surface without the granular 

 lines of Madia. Several rows of exterior discal florets, with a curved tube. 

 Rays white, or ochroleucous, at length red, with a pubescent tube scarcely 

 longer than the disk. 



