302 ON SEEDLINGS 



in Teedia, Dermatocalyx, Halleria, and Leucocarpus, and 

 the one-seeded capsule of Tozzia dehisces rather tardily. 

 Endosperm is very scanty in Melosperma and a few others ; 

 and is altogether wanting in Monttea and Wightia. 



The seeds are generally numerous and comparatively 

 small ; but sometimes large and much modified in form. One 

 of the simplest types is that occurring in Scrophularia nodosa. 

 The seed is oblong or oval, undulated or rugose on the surface. 

 The embryo is nearly as long as the endosperm with narrowly 

 oblong cotyledons, shorter than the radicle. The seed of 

 Pedicularis gracilis is obovoid and reticulate with the reticu- 

 lations considerably elevated so as to form deep areolse. The 

 embryo is three-fourths the length of the seed, and the coty- 

 ledons are roundly oval, about equalling the radicle in length. 

 The seeds of Collinsia violacea are broadly oval and flattened 

 or slightly concave on the ventral face on which the hilum 

 is situated. 



The seeds of Paulownia imperialis are small, oblong, very 

 numerous, and girt by a broad hyaline lacerated wing re- 

 sembling a number of distinct appendages. 



At least three very distinct types are met with in the genus 

 Linaria. The seeds of L. vulgaris (fig. 552) are pendulous, 

 anatropous, much flattened with the testa produced into a 

 wing all round the margin except at the hilum where they 

 are notched. The embryo is as long as the endosperm, and 

 lies in the broader plane of the seed. The cotyledons are oval- 

 oblong, shorter but much wider than the radicle, with their 

 backs to the placental axis, but nearly always more or less 

 oblique to it as if they had become twisted into this position 

 owing to the flattening of the seed. 



The ovules of L. genistifolia are horizontal and anatropous, 

 while the mature seeds are oblong-obovoid and variously 

 angled by being densely packed ; they are always broadest at 

 the end abutting on the pericarp. The embryo is straight 

 and nearly equals the endosperm in length, and the oval 

 plano-convex cotyledons have their longitudinal axis at right 

 angles to the placental axis. The latter character, however, 

 varies somewhat according to the position of the seed on the 

 placenta. In general characters, L. Cymbalaria (fig. 554) 



