68 



ON SEEDLINGS 



except a band along the margin, appearing reticulate by trans- 

 mitted light; petioles very short or almost none; stipules inter- 

 petiolar, subulate-ovate, acute, the hairs united in one piece, pale 

 brown or grey. 



First and second pairs oblong-lanceolate, mucronate, subacute, 

 entire, revolute at the margin. 



Alberta magna, E. Hey. (fig. 433). 



Fruit two-celled, each cell one-seeded, or sometimes empty, 

 dry, woody, indehiscent, oblong, ten-ribbed, surmounted by the per- 

 sistent calyx, two to four, generally two, segments of which become 

 greatly enlarged, leaf-like, and coloured (rose in the dry state) ; 

 enlarged calyx-lobes unequal, trinerved and much reticulated, 

 with the three primary nerves running down the fruit, forming as 



many ribs to the latter, 

 c while the three small 



calyx-lobes have a pro- 

 minent midrib.but nearly 

 obsolete lateral ones. 



Seed oblong, rather 

 slender, conforming to 

 the cavity of the ovary, 

 albuminous ; endosperm 

 fleshy, dirty- white, occu- 

 pying the greater part of 

 the seed ; testa thin, 



adherin g to a fleshy 



FIG. 433. Alberta magna. A, fruit, nat. size : A and 

 B, two of the calyx-lobes developed into wings ; 

 part of B is broken off. B, transverse section of 

 fruit, x 4 : PC, pericarp ; T, testa ; B, radicle of 

 embryo; En, endosperm; V, cavit; 



embryo; En, endosperm; K, cavity appearing 



like an aborted cell in dry fruit. C, longitudinal layer of the endosperm. 

 section of fruit, x 4 : Ca, calyx ; PC, pericarp ; tfmhrnn noavlv aa 



B, radicle ; T, testa ; C, cotyledon ; En, endo- -Umoryo nearly as 



sperm. long as the endosperm, 



but thin and occupying 



only a very small portion of it, straight, colourless ; radicle terete, 

 blunt, slightly thickened at the apex, pointing to the upper end of 

 the seed with its tip just within the endosperm, several times longer 

 than the cotyledons, which are shortly and very bluntly ovate, flat, 

 closely adpressed to one another and embedded in the endosperm 

 with their faces to the axis of the fruit, and therefore in the slightly 

 broader plane of the seed. 



Plectronia ventosa, L. 



Hypocotyl erect, terete, glabrous, 2*5-3 cm. long, green. 

 Cotyledons linear-oblong, obtuse, entire, coriaceous, 

 glabrous, shining green, penninerved like the leaves. 



