454 



ON SEEDLINGS 



Grevillea Hilliana, F. Muell. (fig. 628). 



Ovary of one carpel, one-celled, with two laterally affixed 

 amphitropous ovules. 



Fruit a woody follicle, dehiscing when mature with two valves, 

 one-celled, one- to two- seeded. 



Seed oblate or oval, 1-6-1-8 cm. long by 9-10 mm. wide, -25-'5 

 mm. thick, obtuse at either end, much compressed laterally ; testa 

 membranous, brown, dilated into a moderately broad wing all round ; 

 tegmen very thin, membranous, pale-coloured ; micropyle at one end 

 and chalaza at the other, but within the wing ; hilum on one side 

 below the middle ; raphe visible as a dark line passing from the 



Fir,. 628. Grevillea Hilliana, x 2. A, longitu- 

 dinal section of the seed : H, hilum ; Ha, 

 raphe; Ch, chalaza; W, wing; OT, testa; 

 IT, tegmen; C, cotyledon; Au, auricle; B, 

 radicle. B, transverse section : W, wing ; OT, 

 testa ; IT, tegmen ; C, cotyledon. 



FIG. 629. 



Grevillea Hilliana. 

 Nat. size. 



micropyle along one side of the wing and curved round to the chalaza 

 at the apical end of the embryo. 



Endosperm none. 



Embryo large, straight, filling the cavity of the seed, colour- 

 less ; cotyledons broadly obovate, truncate, nearly or quite flat, 

 tapering to a cuneate base, and having unequal ovate acute auricles 

 on each side of the radicle, lying in the broader plane of the seed 

 with their edges to the placenta, and closely applied to each other 

 face to face, exactly opposite or with the laminae oblique to one 

 another ; radicle shortly fusiform, tapering to a subacute point, pro- 

 jecting a short way beyond the cotyledons and many times shorter. 



