158 



ON SEEDLINGS 



glabrous, green, indistinctly one-veined ; petioles broad, flat, not 

 quite as long as the lamina. 



Stem with primary internodes undeveloped. 



First leaves simple, entire, radical, alternate, broadly obovate- 

 oblong, obtuse, glaucous-green, glabrous, pinnatinerved, exstipulate, 

 petiolate; petiole short, broad, slightly channelled on the upper 

 surface. 



Heliophila pilosa, Lam., var. y, incisa DC. (fig. 166). 

 Siliqua linear, many-seeded. 



Seed variable in outline, oblong, or more or less perfectly orbi- 

 cular, much compressed laterally, with a small notch at the base, 

 and a narrow marginal wing or altogether wingless, pale or deep 



brown, glabrous ; both testa and 

 tegmen membranous ; hilum, 

 micropyle, and chalaza conti- 

 guous, basal ; raphe none. 



Embryo filling the entire 

 seed, pale yellow or colourless, 

 much curved and folded ; coty- 

 ledons incumbent, biplicate, 

 each traversing the length of 

 the seed about three times, that 

 FIG. 166. Heliophila pilosa incisa, x 12. is, first lying towards the base 



1, Longitudinal section of seed: H, of the seed, then folded back 

 jr m ? e ; g ^e? Cr0pyle;jB ' radicle;0r ' te8ta5 towards its apex, and finally 



2, Transverse section of another seed : folded ao'ain towards the base 



^JFt'ttSSRkZSZl and each occupying half the 

 00, testa; 1C, tegmen. thickness of the seed collat- 



erally, linear, obtuse, entire, 



square or variously angled ; the several folds and the radicle occupy 

 the width of the seed ; radicle terete, obtuse, occupying the length 

 of the seed and one end, lying against the back of the third and 

 apical fold of the cotyledons. 



The ' Flora Capensis ' does not say whether the siliquas 

 of the genus Heliophila are dorsally or laterally compressed, but a 

 figure of Heliophila trifida, Thunbg., in the ' Botanical Register,' 

 64, shows a dehiscing siliqua which is dorsally compressed. 



Heliophila crithmifolia, Willd. 



Seed orbicular, flattened or much compressed laterally, testa 

 brown, shrunk when dry so as to show the form of the embryo ; 

 hilum forming a rather deep notch. 



