SCROPHUL ARINE.E 303 



agrees with L. genistifolia, but the seeds are globoso-ovoid, 

 and the crustaceous testa is deeply ridged and furrowed longi- 

 tudinally. The embryo is little more than half the length 

 of the endosperm and has very short cotyledons. In L. re- 

 ticulata the seed is slightly curved and transversely ridged. 

 The embryo is also slightly curved in conformity with the 

 seed. 



A third type is represented by L. purpurea andL. repens. 

 The seeds are peltate and transverse to the placenta, oval 

 in outline, somewhat compressed dorsally, and variously angled 

 by mutual pressure. The testa is thick, crustaceous, variously 

 ridged, furrowed, and reticulate. The embryo is straight, 

 nearly equalling the endosperm in length, while the oval 

 cotyledons are much shorter than the terete radicle. 



A somewhat similar variation of the seeds is met with in 

 the genus Veronica. Four different types have come under my 

 notice. The simplest is that met with in V. serpyllifolia (fig. 

 567). The seeds are anatropous, but the radicle may be 

 superior, horizontal or inferior according to the position of 

 the seed on the elevated cushion-like placenta. The seeds are 

 also very minute and much flattened, but in transverse section 

 oval or oblong according to their stage of maturity and other 

 causes. The embryo varies from one-half to three-fourths 

 the length of the endosperm, and the short cotyledons are 

 scarcely wider than the radicle. 



The ovules of V. arvensis are amphitropous and the seeds 

 (fig. 562) peltate, dorsally flattened, variable in outline owing 

 to mutual pressure and overlapping one another. The ventral 

 face is somewhat concave with a central elevation on which 

 the hilum is situated. The embryo is more than half the 

 length of the endosperm, with ovate cotyledons much shorter 

 than the radicle. V. salicifolia agrees pretty closely with 

 V. arvensis notwithstanding the fact that the former is an 

 erect shrub, while the latter is a procumbent annual herb. 

 The seeds are however slightly less elevated on the ventral 

 face, and the embryo is considerably shorter. 



The ovules of Veronica Buxbaumii are pendulous, hori- 

 zontal or ascending, and semianatropous, and the hilum varies 

 accordingly. The seeds (fig. 563) vary from eight to twelve 



