570 ON SEEDLINGS 



a distinct midrib ; petiole semiterete, channelled above, pubescent 

 with incurved hairs. Hypocotyl short, now rather stout, glabrous. 

 First and second leaf very broadly ovate, sometimes broadly ob- 

 long, obtuse, entire, alternately incurvinerved, thinly pubescent all 

 over and at the margin with incurved hairs, petiolate. 



(Enothera stricta, Ledeb. (fig. 366). 



Seeds "5-1 mm. wide or thick, 1'25-1*5 mm. long. 



DEVELOPMENT OP COTYLEDONS. 



The cotyledons immediately after germination are oblong, obtuse, 

 slightly auricled at the base, otherwise entire, sessile, thinly glan- 

 dular-pubescent on the upper surface and ciliate. Hypocotyl thinly 

 and minutely glandular-pubescent, short. Primary root simple, 

 furnished with root-hairs. 



Five days after germination they have become oblong-ovate, 

 obtuse, shortly petiolate, thinly glandular-hairy. 



Eight days after germination they are more distinctly petiolate, 

 cuneate at the base, and sometimes with a minute but distinct tooth 

 below the middle on each side, denoting the line of demarcation 

 between the upper part or true cotyledon and the lower leaf- like part, 

 thinly glandular-hairy and ciliate. 



Twenty-nine days after germination they become spathulate- 

 obovate or oblong-obovate, obtuse, with a tooth at the union of 

 the foliar with the cotyledonary part on each side, glabrous except 

 the petioles ; upper part without a distinctly visible midrib ; lower 

 part tapering much to the base ; petiole semiterete, flattened above, 

 or shallowly channelled towards the apex, minutely and thinly 

 puberulous, connate at the base. Hypocotyl stout, thinly pubescent. 

 First five leaves at least radical, alternate, lanceolate, obtuse, taper- 

 ing into the petiole, obsoletely and distantly toothed at the margins, 

 alternately incurvinerved, with a conspicuous whitish or colourless 

 midrib, glabrous except the petioles which are semiterete, flattened 

 above or shallowly channelled, dilated at the base. 



(Enothera Lindleyana, Douglas. 



Fruit a narrowly oblong capsule. 



Seed small, varying in shape and size, obovoid or obi ong-ob ovoid, 

 proportionately broad, or on the other hand narrow, sometimes 

 angled ; testa thin, dark-coloured, marked with black spots and pale 

 on the ventral aspect, with two decurrent lines of papillae from the 

 chalaza at the apical end of the seed where the papillas are longest 

 and form an appendage or crest ; micropyle at the narrow and basal 

 end of the seed ; raphe ventral. 



