158 ON SEEDLINGS 



including the long pubescent petiole about 8 cm. long, nearly 

 I cm. wide, yellowish-green. The next two are similar. 



Ultimate leaves simple, radical, and cauline, alternate, petio- 

 late or sessile, alternately penninerved, pinnatifid, hairy ; petiole of 

 the radical leaves semiterete, hairy, dilated and sheathing at the 



Microseris Bigelovii, A. Gray. 



Primary root annual, tapering, slender and branched. 



Hypocotyl glabrous, terete, red, 9-12 mm. long, tapering into 

 and hardly distinguishable from the root. 



Cotyledons linear, slender. 



Stem herbaceous, annual, erect, terete, thinly glandular-hairy, 

 reddish or purplish ; 1st internode '5-1 mm. long ; 2nd about 

 1 mm. 



Leaves simple, cauline, alternate, sessile, sheathing at the base, 

 and ciliate there with white hairs, especially on the sheathing 

 part. 



Nos. 1-6. Linear, entire, acute, shallowly channelled above, 

 slightly keeled beneath, and very slightly widened above the 

 middle, so that they do not greatly differ from the cotyledons. 



Rhagadiolus stellatus, DC. 



Achene almost enclosed by a partially lignified bract ; lanceolate 

 or subulate, straight or curved, prolonged into a beak, or in others 

 crowned by a pappus. 



Seed conforming in shape to the fruit, somewhat laterally flat- 

 tened or terete ; testa smooth ; hilum inconspicuous. 



Embryo straight, filling the whole of the seed ; cotyledons 

 linear, obtuse, entire, yellowish-white, plano-convex, closely ad- 

 pressed face to face, sessile, lying the broad way of the seed, with 

 their edges to the axis of the disc; radicle short, terete, much 

 shorter than the cotyledons, obtuse. 



Seedling (fig. 487). 



Primary root long, slender, tapering, giving off numerous lateral 

 rootlets, annual. 



Hypocotyl short, stout, fleshy, passing into the root. 



Cotyledons oblong- spathulate, obtuse, glabrous, 1'5 cm. long; 

 petiole flattened above, scarcely channelled, 1 cm. long. 



Stem annual, developed when about to flower. 



Leaves simple, radical, ultimately cauline, alternate, light green, 

 rather coarsely hairy, especially on the under side and the petioles ; 



