CKUCIFEILE 147 



double, outer (testa) membranous, pale yellow, glabrous ; inner 

 (tegmen) paler and thinner ; hilum basal, at one end of the 

 seed ; raphe none ; micropyle basal, close to the hilum and superior 

 to it. 



Endosperm absent. 



Embryo large, curved, occupying the whole interior of the seed, 

 pale yellow ; cotyledons oblong-oval, obtuse, entire, flat, closely ad- 

 pressed face to face, petiolate ; radicle slender, cylindrical, suddenly 

 tapered to a subacute point, curved, nearly or quite as long as the 

 accumbent cotyledons ; petioles short, slightly twisted to allow the 

 edges of the cotyledons to be applied to the radicle. If it were not 

 for the petioles the cotyledons would evidently be incumbent, as 

 happens in some species of Cheiranthus, with their backs instead 

 of their edges to the placenta ; under existing conditions the backs 

 of the petioles are to the placenta. 



Seedling (fig. 159). 



Hypocotyl herbaceous, erect, terete, glabrous, or hairy towards 

 the top ; hairs adpressed, forked at right angles and thus appearing 

 as if fixed by the middle ; 12-27 mm. 

 long. 



Cotyledons broadly ovate, retuse, 

 entire or very minutely or slightly emar- 

 ginate, suddenly tapering into the petiole, 

 glabrous or slightly hairy here and there 

 on the upper surface ; petiole with forked 

 hairs as described above ; lamina 10-13 

 mm. long, 6'2-10 mm. wide ; petiole 8'5- 

 11'5 mm. long. 



Stem herbaceous, erect, terete, covered 

 with hairs as described above, ultimately 

 shrubby below ; internodes short but 

 variable ; 1st 3-7 mm. long ; 2nd often 

 very short or scarcely developed, bringing 

 the first two leaves nearly opposite ; 3rd 

 more elongated. 



Leaves simple, cauline, alternate, exstipulate, petiolate, covered 

 on both sides, especially in a young state, with forked, peltate hairs 

 rarely branching stellately, and closely adpressed, with the branches 

 lying in the same plane ; petioles convex on the back, grooved on 

 the upper face and pubescent like the leaves. 



Nos. 1-6. Lanceolate-elliptic, acute, petiolate, obscurely reticu- 

 late, often minutely and sparingly denticulate. 



FIG. 159. Cheiranthus Cheiri 



(wild specimen). Two-thirds 



nat. size. 



