ONAGRARIELE 567 



Sixteen days after germination (fig. 363) the cotyledons are 

 much larger, with longer petioles, and rarely show a minute tooth 

 towards the base, otherwise the same. 



Hypocotyl glandular-pubescent. 



First leaf alternate, lanceolate, obtuse, petiolate, alternately 

 incurvinerved in the upper half, and suboppositely incurvinerved in 

 the lower, obtusely and obsoletely dentate at the margin, glandular- 

 pubescent. 



(Enothera biennis, L. (fig. 364). 



Fruit a capsule, oblong or cylindrical, four-celled, many-seeded, 

 dehiscing by four valves longitudinally and loculicidally, separating 

 also from the axis, rigid or becoming woody when dry. 



Seeds extremely variable in outline, oblong, obovoid, variously 

 compressed and angled, often short, deep brown ; testa variously 

 thickened on one or two sides, but especially at all the projecting 

 angles, corky, brown or almost black ; tegmen thin, membranous, 

 whitish ; hilum and micropyle contiguous, basal ; raphe passing 

 along one of the thickened sides ; thickening corresponding to the 

 chalaza, not quite apical, but a little on one side. 



Endosperm absent. 



Embryo straight, comparatively large and filling the interior of 

 the seed, colourless ; cotyledons normally oblong, obtuse, minutely 

 auricled at the base, sessile, plano-convex, lying in the broader way 

 of the seed when the latter is in any way compressed, with their 

 backs to the raphe or their edges to it, variable ; radicle shorter 

 than the cotyledons, or about one third the length of the whole embryo, 

 turbinate, obtuse, and projecting beyond the auricles of the cotyledons, 

 lying in the generally pointed base of the seed. 



NOTE. Another very prevalent form of embryo has one of its 

 cotyledons, or sometimes both, involute. 



Seedling (fig. 365). 



Primary root tapering, flexuose, furnished with flexuose fibres. 



Hypocotyl partly subterranean, terete, glabrous, reddish, 2-4 mm. 

 long (when germinated in the open ground). 



Cotyledons ovate, obtuse, shortly petiolate, glabrous, with a pro- 

 minent midrib, and ascending incurved anastomosing lateral nerves 

 (the latter seen only when the cotyledons are colourless and decay- 

 ing), deep green or stained red in cold weather, 3-25-6 mm. long 

 exclusive of petiole, 2-4 mm. wide ; petiole channelled above, per- 

 foliate at the base, -75-1-5 mm. long. 



Stem herbaceous and developed when about to flower, biennial. 



