310 ON SEEDLINGS 



Seeds twenty to twenty-eight in a capsule about 1-5-1-75 mm. 

 in diameter, much more decidedly echinulate all over the disc than 

 those of L. vulgaris. 



I. alpina, DC. 



Capsule opening by six valves, three- to six-seeded, twelve- to 

 twenty-ovuled, S'25-3'5 mm. long, 2-5-3 mm. wide, and 2-2-25 mm. 

 thick. 



Seeds orbicular, concave on the ventral aspect, 2-2-25 mm. in 

 diameter. 



Linaria genistifolia, Mill. 



Ovary two-celled, many-ovuled ; ovules horizontal, anatropous, 

 seated on an elevated or enlarged placenta ; micropyle horizontal 

 and abutting against the placental axis. 



Fruit a capsule, broadly ovoid, obtuse, glabrous, subglaucous- 

 green, two-celled, many-seeded, dehiscing at the apex by four valves. 



Capsule 5'5-6 mm. long, 5-5'5 mm. wide, 4-5-5 mm. thick, con- 

 taining one hundred and twenty to one hundred and thirty-six seeds. 



Seeds oblong-obovoid, variously shaped and angled by mutual 

 pressure, reticulate, densely packed horizontally all over the axis, 

 broadest at the end abutting on the pericarp ; testa thick, crusta- 

 ceous ; hilum basal, inconspicuous ; micropyle contiguous to the 

 hilum. 



Seed 1-1-25 mm. long, about '75 mm. wide, and -5 mm. thick. 



Endosperm comparatively copious, but occupying only a small 

 portion of the seed, fleshy, white. 



Embryo straight, nearly equal in length to the endosperm, 

 colourless, small ; cotyledons oval, obtuse, entire, sessile, plano- 

 convex, with their long axis at right angles or perpendicular to the 

 placental axis ; radicle terete, obtuse, considerably longer than the 

 cotyledons, close to the hilum and pointing to the placenta. 



Seedling. 



Primary root tapering downwards, fibrous, perennial. 



Hypocotyl terete, slender, glabrous, green or glaucous-green, 

 1-2 cm. or more above the soil, ultimately decumbent, sometimes 

 proliferous immediately above the soil, and giving off one to six or 

 more branches that soon become stronger and longer than the 

 primary stem or plumule. This it is able to do even if the coty- 

 ledons and plumule should be broken off. 



Cotyledons lanceolate or ovate-lanceolate, obtuse, narrowed into 

 a short petiole, slightly constricted about the middle of the lamina, 



